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State Route 108

Click here for a key to the symbols used. An explanation of acronyms may be found at the bottom of the page.


Routing Routing

  1. Rte 108 Seg 1Unconstructed From Route 5 near Crows Landing to Route 99 near Modesto.

    Post 1964 Signage History Post 1964 Signage History

    In 1963, this segment was defined as "From Route 5 near Crows Landing to Route 99."

    In 2009, SB 532 (Chapter 189, 10/11/2009) clarified the terminus as "Route 99 near Modesto"

    Pre 1964 Signage History Pre 1964 Signage History

    This was LRN 109 (1959 extension), and was a proposed routing.

    Status Status

    This part is unconstructed. The traversable local routing runs along Fink Road and Crows Landing Road from Crows Landing to Modesto. The county has inquired about the state adopting this route, but the state has no plans to do so.


  2. Rte 108 Seg 2From Route 132 in Modesto to Route 120 east of Oakdale.

    Post 1964 Signage History Post 1964 Signage History

    In 1963, this segment was defined as "(b) Route 99 to Route 120."

    In 1984, Chapter 409 changed the origin of this route from "Route 99" to "Route 132 in Modesto", and clarified the terminus as "Route 120 in Oakdale." This deleted portion of (b) from Route 99 to Route 132.

    In 2009, SB 532 (Chapter 189, 10/11/2009) changed the terminus to "Route 120 in east of Oakdale."

    Pre 1964 Signage History Pre 1964 Signage History

    This was LRN 109 between Route 132 (originally from US 99) to present-day Route 219. It was defined in 1933.

    Between Route 219 and Route 120, this was LRN 13, defined as part of the state highway system in 1909.

    These segments were added to signed Route 108 in 1961, but were not part of the initial signage of Route 108 in 1934. E of this point, Route 108 is cosigned with Route 120 to Yosemite Junction.

    Status Status

    North County Corridor (~ STA 27.679 to 120 STA 11.375)

    [108 Oakdale]In May 2010, the CTC approved for future consideration of funding a project in Stanislaus County that would study corridor options for a future alignment of Route 108 near the city of Oakdale. There is no construction for this project because it is for route adoption only. Once the route adoption is approved by the Commission, and funding becomes available, the Stanislaus Council of Governments and the Department will conduct further environmental studies to identify a roadway alignment within the selected corridor. The construction of the new roadway is anticipated to occur in Fiscal Year (FY) 2025. Conceptual level cost estimates to build a new roadway range from $600 to $800 million (FY 2009 costs), and $1.3 to $1.5 billion (FY 2030 costs). It is expected that the future project, however, will have potential impacts to land use, farmlands, cultural resources, biological resources, relocations, hazardous waste, water quality, paleontology, and air quality.

    Specifically, the proposal is to modify the adopted route for Route 108 in Stanislaus County, in the vicinity of the cities of Modesto, Riverbank, and Oakdale. The ultimate facility is planned as a multi-lane freeway/expressway corridor, approximately 18 miles long. A Project Report was approved on April 13, 2010. An Environmental Impact Report was prepared for California Environmental Quality Act and the document was approved on April 13, 2010. This 18 mile long project, referred to as the North County Corridor (NCC) Route 108 East Route Adoption, will bypass the cities of Riverbank and Oakdale, improve interregional system connectivity, and improve regional traffic operations.

    Route 108 is generally classified as a minor arterial through most of the project limits except for sections through the cities of Riverbank and Oakdale that are classified as principal arterial. Existing Route 108 functions as a “main street” and is predominantly a two-lane undivided conventional facility. Between the intersection of Route 108 (McHenry Avenue)/SR 219 (Kiernan Avenue) and the intersection of Route 108/Route 120 with Lancaster Road, Route 108 is encumbered by 83 public street intersections and many private driveways with direct access onto Route 108. It is highly congested during peak travel times and these conditions are expected to worsen as traffic volumes on Route 108 increase in the foreseeable future. Increasing levels of traffic on both Route 120 and Route 108 into and through the City of Oakdale have led to a growing traffic congestion problem that the Department and the local community have been addressing for over five decades. Traffic on Route 108 includes a combination of commuter, local commerce, goods movement, agricultural and farm operations, and a large component of interregional recreational traffic. This elevated interregional traffic demand often conflicts with local traffic demand resulting in congestion, increased noise and air pollution. Route 108 provides direct access to local residences, farms, and other community facilities along its route but also travels through the busy downtown areas of Oakdale and Riverbank. Congestion is most severe during weekends due to recreational traffic traveling to Yosemite National Park, and to the Jamestown and Sonora areas. Weekdays can also be very congested due to the heavy commute traffic. The area most severely affected by congestion is at the junction of Route 108 and Route 120 (Yosemite Avenue) in downtown Oakdale where the level of service (LOS) in 2001 was classified as “F”, representing heavily congested traffic with long delays. These conditions are expected to worsen over time as development continues and traffic volumes increase. The LOS is projected to degrade to “very high delays” by the year 2020 in the absence of any system improvement.

    North County ConnectorThe ultimate facility is planned as a multi-lane freeway, approximately ten miles long, from Route 219 and McHenry Avenue to just east of Albers Road and as a multi-lane controlled access highway for the remaining eight miles until it connects with Route 120, approximately six miles east of the City of Oakdale. The freeway segment will serve the urban areas of Modesto, Riverbank, and Oakdale. The controlled access highway segment is planned for the rural area of Stanislaus County south-east of Oakdale. The route adoptions will be executed as two concurrent CTC actions on this month’s agenda (see also Resolution HRA 10-03). Although the North County Corridor encompasses a roadway facility between Route 99 and Route 120, the proposed State route adoption is only for the segment between Route 108 (McHenry Avenue) and Route 120. These limits are a result of discussions occurring June 2008 to February 2009 between State and local entities. A freeway adoption connecting to Route 99 was interfering with the development of a modification proposal at the Hammett Road/Route 99 interchange. The Project Study Report for that project has assumed Hammett would remain a local road and proposes a local type interchange at Route 99. The Department concurred to pursue evaluating the new NCC Route 108 East Route Adoption. This request is for the Freeway Route Adoption, and a separate request is being submitted for the Controlled Access Highway Route Adoption (Resolution HRA 10-03). These two route adoptions will allow for the execution of a freeway agreement and a controlled access highway agreement with Stanislaus County.

    Relinquishment of the existing Route 108 will occur after construction of the new bypass. Relinquishment will transfer the State’s right of way, title, and interest of the superseded section of Route 108 to the City of Oakdale, City of Riverbank, and Stanislaus County as depicted in the attached Route Adoption Map.

    Atlas vs LancasterIn September 2016, it was reported that one of the last remaining battles over potential paths for the future North County Corridor may be nearing an end, with momentum building for a tie-in with existing Route 108 east of Oakdale at Lancaster Road. Dozens of families in neighborhoods four miles to the west for months have protested the concept of a roundabout at Atlas Road, with the North County Corridor shooting south from that point and paralleling Stearns Road before skirting Oakdale and running between Riverbank and Modesto. Oakdale officials previously preferred the Atlas tie-in, thinking it might funnel cars near a future shopping center; however, the city has changed its mind and has adopted a resolution supporting the neighbor-preferred Lancaster option. The EIR should be released in January 2017. Controversy over the road’s western stretch, between Modesto and Riverbank, died down a few years ago as engineers focused on redoing Kiernan Avenue, with legitimate freeway interchanges at McHenry Avenue, Coffee and Oakdale roads, and Roselle Avenue. If Caltrans picks the Lancaster tie-in on the east end, the only unresolved choice would be south of Oakdale, with one option close to the south edge of the city and the other further south, largely focused on Claribel Road. Leaders of the county and three cities would review the draft environmental study around March, accepting input from the public and seeking consensus among each other. Caltrans’ final route selection could follow in early 2018.
    (Source: Modesto Bee, 9/22/2016)

    The August 2017 Draft EIR noted: The proposed project will connect Route 219 near Modesto to Route 120 near Oakdale. This environmental document analyzes the four Build Alternatives (1A, 1B, 2A, and 2B) and the NoBuild Alternative. The western end of all alternatives is at the Route 219 (Kiernan Avenue)/Tully Road intersection. The project is analyzed as three distinct segments for environmental evaluation purposes and explaining the proposed improvements. Segment 1 represents the more urbanized area; Segment 2 represents a transition from urbanized to rural area; and Segment 3 represents the rural foothill area.
    (Source: NCC DEIR August 2017)

    Rte 180 NCC AlternativesSegment 1 begins at the Route 219 Kiernan Avenue/Tully Road intersection, which is the western end of the project for all four alternatives. All of the Build Alternatives proceed along the same alignment, extending to the existing Claus Road/Claribel Road intersection near the southeast portion of the City of Riverbank and northeast portion of the City of Modesto’s future sphere of influence, including future areas projected to be incorporated into the City boundaries. The following interchange/intersection designs are common to all Build Alternatives for Segment 1: (◆) Tully Road/Route 219 (Kiernan Avenue) intersection will consist of a modified signalized at-grade intersection; (◆) Route 108 (McHenry Avenue)/Route 219, (Kiernan Avenue)/new Route 108, Coffee Road/new Route 108, Oakdale Road/new Route 108, and Roselle Avenue/new Route 108 will all consist of a proposed single-point urban interchange and separate-grade undercrossing structures; (◆) The Claus Road/new Route 108 signalized at-grade intersection will provide access from the new Route 108 facility east of Claus Road as well as the local road access to the City of Riverbank and future northeastern areas of the City of Modesto.

    Segment 2 is where the four similar alternatives separate into two different alignments (1A/1B and 2A/2B). In Segment 2, Alternatives 1A and 1B veer northeast from near the existing Claus Road/Claribel Road intersection and pass through the southern boundary of the City of Oakdale to just east of Albers Road, and Alternatives 2A and 2B continue to extend easterly along Claribel Road and veer northeastward past the intersection of Claribel Road/Bentley Road to just east of Albers Road. In Segment 2:

    • Alternative 1A veers northeast from the Claus Road intersection and crosses Langworth Road and Patterson Road while extending 3.2 miles northeast at an approximately 45-degree angle. Past the Lexington Road and Crane Road intersection, Alternative 1A overlies the existing Lexington Road and extends easterly to Albers Road. Within Segment 2, no private driveway access is proposed. From Albers Road, Alternative 1A splits into the other possible alignments to intersect Route 108/Route 120.
    • Improvements for Alternative 1B in Segment 2 are identical to those listed in Alternative 1A.
    • Alternative 2A continues east mostly along the existing Claribel Road alignment. Just east of the Bentley Road/Claribel Road intersection, Alternative 2A veers northeast and crosses Oakdale-Waterford Highway.
    • Improvements for Alternative 2B in Segment 2 are identical to those listed in Alternative 2A.

    In Segment 3, Alternatives 1A and 2A merge as similar alignments at the southern end of the City of Oakdale and continue on the same alignment to the proposed eastern end (A) at the new Route 108/Route 120 intersection just east of the City of Oakdale boundary. In Segment 3, Alternatives 1B and 2B merge as similar alignments north of the existing Warnerville Road/Emery Road intersection and continue on a northeasterly direction to the proposed other eastern end (B) at the new Route 108/Route 120 intersection west of the existing Route 120/Lancaster Road intersection. In Segment 3:

    • Alternative 1A begins near Warnerville Road west of South Stearns Road and the Sierra Railroad. Alternative 1A runs northward, parallel to South Stearns Road, before crossing over the Sierra Railroad west of the South Stearns Road and Sierra Road intersection. It curves eastward until it ultimately ends at the intersection with Route 120.
    • Alternative 1B begins near Warnerville Road, similar to Alternative 1A. But instead of turning north toward South Stearns Road, Alternative 1B continues northeast for 3.3 miles, and then crosses the Sierra Railroad with a grade-separated structure before turning northward toward Fogarty Road and its Route 108/Route 120 end, 1.5 miles east of the Route 108/Route 120 and Wamble Road intersection. The South Stearns Road intersection (east of Bendler Road and northeast of Oakdale Irrigation District South Main Canal) with the proposed North County Corridor alignment will consist of an at-grade intersection with two 12-foot-wide through lanes in each direction along the North County Corridor alignment. Fogarty Road will be elevated over the North County Corridor alignment with an overcrossing structure along its current alignment. A new local road intersection will cross the proposed North County Corridor alignment at approximately 5,000 feet south of the Route 108/Route 120 eastern end with an at-grade four-way roundabout. The roundabout will consist of one combination through/exit lane and one exit lane. The intersection of Route 108/Route 120 with the proposed North County Corridor alignment will consist of an at-grade three-way roundabout with one 12-foot-wide combination through/exit lane and one exit lane for all directions except along westbound Route 108/Route 120.
    • After crossing the Oakdale/Waterford Highway, Alternative 2 curves northeast as it crosses the Claribel Lateral Canal, then continues northward toward the direction of South Stearns Road and the Sierra Railroad. It ends at the intersection with Route 108/Route 120, approximately two-thirds of a mile east of the Route 108/Route 120 and South Stearns Road intersection.
    • Segment 3 of Alternative 2B shares the same design with Segment 3 of Alternative 1B intersections at North County Corridor/Fogarty Road, North County Corridor/New Local Access Road, and North County Corridor/Route 120. These three intersections are discussed under Alternative 1B Intersections. Other intersection designs unique to this alternative are the Smith Road intersection with the proposed North County Corridor alignment, which will consist of an at-grade intersection. The North County Corridor will be elevated over Warnerville Road with an undercrossing structure along the current alignment of Warnerville Road.

    In November 2018, the Stanislaus County Public Works Department noted that, on October 3, 2016, the Oakdale City Council passed a resolution of preliminary support for NCC Alternatives 1B and 2B. With the official release of the Draft EIR/EIS on August 9, 2017, City staff has had the opportunity to review the Draft EIR/EIS and believes that Alternative 1B should be the preferred alternative. At their September 18, 2017 meeting, the Oakdale City Council unanimously passed a resolution to send Caltrans an official comment letter stating the City’s preference for Alternative 1B. On October 24, 2017 City of Riverbank City Council took the same action for similar reasons. The Riverbank City Council unanimously passed a resolution adopting Alternative 1B as the City’s preferred North County Corridor route Alignment.
    (Source: Stanislaus County Public Works Presentation, 11/2018)

    In December 2018, it was reported that Federal highway officials approved a $20 million grant for the North County Corridor, a future expressway skirting Modesto, Riverbank and Oakdale in north Stanislaus County. The road is expected to cost $688 million and will require additional funding. State transportation officials are expected to pinpoint the exact route in early 2019, and construction could be a few years away. The project was one of only four in California drawing BUILD money, formerly known as TIGER grants; BUILD stands for Better Utilizing Investments to Leverage Development. The corridor will be a west-east facility from Route 108 (McHenry Avenue) north of the City of Modesto to Route 120 approximately six miles east of the City of Oakdale. This new roadway would be approximately 18 miles in length from a location on Route 219 (Kiernan Avenue) to a location on Route 120 approximately six miles east of the City of Oakdale. The project may be an entirely new roadway or incorporated into the existing roadway network and would serve as a bypass for the cities of Riverbank, Oakdale and Modesto. The North County Corridor Transportation Expressway Authority anticipates that the ultimate facility would be planned as a multi-lane, access-controlled expressway/freeway, with interchanges, at-grade intersections, grade-separated railroad crossings, irrigation district crossings, frontage roads, and local street alignments. Various roadway alignment alternatives will be considered. The proposed roadway would be built in existing unincorporated Stanislaus County. Funding for this phase of the project is being provided by regional transportation impact fees and the state funding that was once part of the cancelled state Oakdale Bypass project.
    (Source: Modesto Bee, 12/10/2018; NorthCounty Corridor Webpage)

    In June 2020, it was reported that the EIS for the Route 108 Modesto bypass expressway, the first phase of which extends from the Route 108/Route 219 junction north of Modesto to a terminus at present Route 108/Route 120 east of Oakdale, has been approved.  Stanislaus County has a corridor design simulator that follows the facility, which is being designed as a combination freeway/expressway, from west to east.  The routing has three roundabouts on the main expressway lanes (3+3 on the west end; 2+2 east of Riverbank), along with several interchanges at major arterials.  Two of these are multi-lane; the last one is at the eastern terminus as the connector to Route 120.  The expressway is designed to be upgradeable to full freeway (likely with bridges over the circles); also, in a future phase this corridor will follow Route 219 west to Route 99 near Salida.
    (Source: Scott Parker on AARoads, "Re: California", 6/11/2020)

    McHenry Avenue Widening (~ STA 29.069 / STA 31.785)

    The 2018 STIP, approved at the CTC March 2018 meeting, appears to allocate $4.1M, but delay to FY20-21, PPNO 3047 McHenry Av, Route 108 (Ladd/Patterson)-McHenry Bridge, widen. (~ STA 29.069 to STA 31.785). The project is located 2.4 miles south of Route 120 near the City of Modesto. The purpose of the project is to widen the existing 2 lane McHenry Avenue to a total of 5 lanes from the intersection of Ladd/Patterson Road to the south abutment of McHenry Avenue Bridge over the Stanislaus River. Work associated with the roadway widening will include the reconstruction of the roadway, remove existing McHenry Avenue Bridge over Dry Slough and replace with a culvert topped with earthen fill, relocation of traffic signal, restriping, install metal beam guardrail, storm sewer system, curb and gutter, and a Class II bike lane. Project’s total cost is approximated at $13,025,000.

    The 2020 STIP, approaved at the March 2020 CTC meeting, adjusts the programmed allocations for PPNO 3047 "McHenry Av, Rt 108 (Ladd/Patterson)-McHenry Bridge, widen" by increasing the amount from $4.1M to $4.86M.
    (Source: March 2020 CTC Agenda, Item 4.7, 2020 STIP Adopted 3/25/2020)

    Naming Naming

    R. Kirk LindseyThe portion of Route 108 beginning in Modesto at Five Points (J Street, Needham Street, Downey Avenue, McHenry Avenue, and 17th Street) continuing east to Riverbank (~ STA 23.081 to STA 32.635) is named the "R. Kirk Lindsey Memorial Highway" This segment was named in memory of R. Kirk Lindsey, whose indomitable spirit, forthright and honest demeanor, and fine personal example were an inspiration to the people throughout the State of California and the nation. A 1969 graduate of Abilene Christian College with a Bachelor of Science degree in business, R. Kirk Lindsey attended graduate school at Abilene Christian College and went on to earn a Master of Business Administration degree from Pepperdine University. He served his country with honor and distinction in the United States Army for almost four years beginning in 1969 and was honorably discharged at the rank of Captain. He became the Superintendent of Seattle Stevedore Company in 1972, and later brought immense credit and distinction to himself as Managing Partner of B & P Bulk, partner of P & L Properties, salesperson for Federal Crop Insurance Corporation, and owner of Pizza Machine, Cable Car Food & Deli, and Saratoga Travel. R. Kirk Lindsey served as the girls' aquatics coach for swimming and water polo at Beyer High School for over 20 years. He was appointed to the California Transportation Commission (CTC) in 2000, and served two four-year terms during which he upheld CTC's mission to enhance the economic, social, and environmental welfare of all Californians by providing for a comprehensive, multimodal state transportation system that is consistent and compatible with orderly economic and social progress of the state. In addition to his professional responsibilities, R. Kirk Lindsey was active in the community as a member of numerous local and statewide boards, associations, commissions, and professional organizations. He died on June 10, 2009. Named by Senate Concurrent Resolution (SCR) 54, Resolution Chapter 79, on 8/11/2010.
    (Image source: Legacy.Com)

    Named Structures Named Structures

    Bridge 32-0011, the Riverbank overhead in Stanislaus county (~ STA R032.34), is named the "W. W. Brookey Overhead Memorial Bridge". W.W. Brookey served the City of Riverbank as City Engineer from the time the city was incorporated on September 1, 1922 until his death on May 13, 1971. The bridge was built in 1972, and named by Senate Concurrent Resolution 9, Chapter 138, in 1973.

    National Trails National Trails

    Historically, this segment has been part of the "Mark Twain-Bret Harte Trail".


  3. Rte 108 Seg 3From Route 120 near Yosemite Junction to Route 49 south of Jamestown.

    Post 1964 Signage History Post 1964 Signage History

    As defined in 1963, this segment was not part of Route 108; rather, it was part of Route 120. In 1965, Chapter 1372 transferred the segment from Route 120 to this route, allowing for a realignment of Route 49: (c) Route 120 near Yosemite Junction to Route 49 south of Jamestown. It was transferred to Route 108 in 1965.

    Pre 1964 Signage History Pre 1964 Signage History

    This segment is part of LRN 13, defined in 1909. It is cosigned as Route 108/Route 120. It was added to signed Route 108 in January 1961.

    Status Status

    Yosemite Junction (~ TUO L0.128)

    In June 2015, it was reported that Tuolumne County transportation officials are proposed their own construction project preference to Caltrans proposed plans for improving safety and congestion problems at Yosemite Junction (where Route 108 and Route 120 meet (~ TUO L0.128)). Caltrans has proposed two options; one involving a stop light and the other a roundabout. Both would include adding additional lanes in both directions on Route 108. The county is concerned about the limited site distance coming down the hill into the intersection. They are also concerned, for the eastbound traffic, that once past the intersection, must go directly up a steep grade with a single lane that widens to a passing lane farther up the highway. They would like to see the second lane start before the intersection so trucks can cue up there. They also suggested, if there is a light, it should be coordinated with the light at O’Byrnes Ferry Road and perhaps use technology to identify, when trucks are going in the eastbound direction, to hold the light green so they can keep their momentum going up the hill.
    (Source: MyMotherLode, 6/11/2015)

    In April 2019, it was reported that Caltrans was preparing a highway improvement project that will upgrade the junction of Route 108 and Route 120 at Yosemite Junction. Road construction starts in early May 2019, with the project expected to finish in August 2019. Caltrans will make roadway improvements and install a traffic signal, using a “High-T” intersection configuration. This is similar to a typical signalized intersection, except that westbound traffic on Route 108 would only be forced to stop when a pedestrian or cyclist is crossing. Because few pedestrians are anticipated and bicycle volumes are low at this location, the “High-T” signal for these westbound vehicles will be green most of the time. The signal will have a greater impact for vehicles on westbound Route 108 turning left onto Route 120, and vehicles on eastbound Route 120. Currently, vehicles turning left at the intersection have to wait for a suitable pause in traffic before turning. There are times traffic is so intense that CHP directs vehicles through the intersection. Caltrans’ project also will benefit motorists approaching the three-way intersection from westbound Route 120 – a busy route, as Route 120 delivers visitors to and from Yosemite National Park and foothill towns that dot the highway. After the project is completed, a traffic signal will provide ample opportunities for vehicles turning left while staying on Route 120. As added safety measures, Caltrans will extend the left-turn lane on Route 108 and the ‘refuge’ lane for vehicles on westbound Route 120 turning left onto Route 120. That ‘refuge’ lane provides time and space for vehicles to match the flow of traffic before entering the mainline. A cement curb will separate the left-turn and ‘refuge’ lanes from the mainline. George Reed Inc. of Modesto will perform this work for $3.3 million.
    (Source: Caltrans District 10 FB Post, 4/25/2019)

    In September 2019, it was reported that new traffic lights are up and activated at Yosemite Junction, part of a $3.3 million Route 108/Route 49 and Route 120 safety project that is now in wrapping stages.
    (Source: MyMotherLoad, 9/18/2019)

    1933 Dardanelle Bridge

    In October 2018, it was reported that the historic 1933 Dardanelle Bridge that used to be the Route 108 crossing over the Middle Fork Stanislaus River (~ TUO 53.257) was destroyed in the Donnell Fire in August 2018. The bridge was located just east of where the 1920s Dardanelle Resort burned in the same fire in early August. Testing has come back negative for asbestos in the bridge debris, which was the primary concern local authorities had, based on Caltrans records, said Tim Hughes, Stanislaus National Forest engineer. Local historians say the old Dardanelle Bridge was built in 1933, when Dardanelle Resort was about 10 years old, in the midst of the Great Depression. According to the Historic American Engineering Record, the reason the Dardanelle Bridge was needed was back in the 1930s many of California’s bridges were becoming obsolete. Designs that had been adequate for horse-drawn carriages and wagons were inadequate for increasingly heavy automobiles and trucks. The old Sonora Mono Wagon Road Bridge, about a hundred yards upstream from where Route 108 is today, dated back to 1864. Hand-stacked stone buttresses dating to the 1860s are still there, within sight of the current bridge. The old Sonora Mono Road passed right through Dardanelle Resort. Contractors hired by the state in 1933 built the old Dardanelle Bridge by hand labor also, using a pneumatic jackhammer to drill rock for blasting. They built it in just over two months for a total cost of less than $7,300, which included asphalt paving by state workers once the contractors were finished. Sand and gravel for concrete came from a bar in the Middle Fork Stanislaus about three miles east of the bridge site. Workers used Calaveras brand Portland cement from a plant near Sonora. Reinforcing and structural steel came from Palm Iron Works in Sacramento. Redwood timber came from Union Lumber Company at Fort Bragg in Mendocino County. Historians also say the 1933 Dardanelle Bridge was the last known timber scissors truss, a type of bridge suited for fast installation in rugged locations. It served its purpose more than 50 years. In 1978 the state Department of Transportation proposed replacing it, then delayed the project until 1987, when the Dardanelle Bridge was determined eligible for inclusion in the National Register of Historic Places. In May 1990, the old bridge sustained damage when contractors working on the new bridge dynamited granite boulders into the upstream side of the historic Dardanelle Bridge. According to the Historic American Engineering Record, the old bridge remained in the ownership of Caltrans, to “maintain it consistent with The Secretary of Interior’s Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings.”
    (Source: Union Democrat, 10/15/2018)

    Naming Naming

    Tuolumne County Vietnam Veterans Memorial HighwayThe portion of Route 108 located in Tuolumne County is designated the "Tuolumne County Vietnam Veterans Memorial Highway." It was named in honor of the veterans from California that served in the Vietnam War. The State of California has the largest United States veteran population in the nation, comprised of some 3.3 million armed services veterans who represent 12.3 percent of the nationwide veteran population of nearly 27 million. More than 350,000 California veterans served in the Vietnam War, which resulted in 40,000 of them being wounded and 5,822 killed or missing in action, representing more than 10 percent of the nation's total casualties. In fact, more California residents died in the Vietnam War than residents of any other state, and more Californians received the Medal of Honor, the Bronze Star, and the Purple Heart than veterans of any other state. Named by Assembly Concurrent Resolution 17, Chaptered 7/8/2003, Chapter 89.
    (Image source: MyMotherLoad, 9/18/2019)

    The portion of this route from Route 120/Route 108 junction to the Route 108/Route 49 junction (~ TUO L0.086 to TUO L2.701) is named the "Frank F. Momyer Bypass". It was named by Assembly Concurrent Resolution 112, Chapter 97, in 1986. Frank F. Momyer, General Manager of Pickering Lumber Company, led a widely supported and extensive public effort from 1963 to 1982 to secure construction of the Sonora Bypass, a portion of Route 108 in Tuolumne county.


  4. Rte 108 Seg 4From Route 49 south of Jamestown to Route 395 via the vicinity of Sonora and Long Barn.

    Post 1964 Signage History Post 1964 Signage History

    In 1963, this segment was defined as "From Route 49 to Route 395 via the vicinity of Sonora and Long Barn."

    In 2009, SB 532 (Chapter 189, 10/11/2009) changed the origin to "Route 49 south of Jamestown".

    Back in the sixties, Caltrans wanted to upgrade Route 108 to a freeway all the way over the pass. They had detailed plans drawn up that included a seven mile long tunnel that would start in what is now the Carson Iceberg Wilderness and terminated near the Marine base. The proposal was abandoned due to community opposition. Today, Caltrans is slowly upgrading portions of Route 108 to a freeway using some of the ROW bought in the sixties, according to a posting by Travis DeCoster.

    Pre 1964 Signage History Pre 1964 Signage History

    This is the original Route 108 as defined in the initial signage of state routes in 1934 (Jct. Route 49 at Sonora to Jct. Route 7 (US 395) at Sonora Junction). It was LRN 13. The portion to Sonora was defined in 1909, the remainder in 1910 or 1901. One record shows the portion from Sonora to Long Barn as having been defined in 1919. This segment has grades as steep as 26%.

    The first documented crossing of Sonora Pass was in October of 1841 which apparently slightly north of the modern highway. The first attempted wagon crossing of Sonora Pass was in 1852 the hazards of the roads of the route were documented by Grizzly Adams later in 1854. A pack animal route was laid out in 1862 on nearby St. Mary Pass which crossed the Sierras at 10,040 feet above sea level. By 1863 the present Sonora Pass alignment which CA 108 later adopted was surveyed and a toll road opened in 1865.
    (Source: Gribblenation Blog)

    Status Status

    In October 2004, the CTC considered relinquishment of right of way in the County of Tuolumne, between one kilometer west of Sanguinetti Road and Standard Road (~ TUO R1.255 to TUO R4.514) . Consistent with the Department’s mandatory design standards, access control is retained at specified locations to protect the operational integrity of the superseding Route 108. The County, by freeway agreement dated December 10, 1996, agreed to accept title upon relinquishment by the State and by cooperative agreement dated July 20, 2004, waived the 90-day notice requirement and agreed to accept title upon relinquishment by the State.

    In February 2008, the CTC relinquished a portion of the route at Mono Way, between 0.15 miles west of Sanguinetti Road (Loop Road) (~ TUO R1.891 to TUO R2.161) and the easterly city limit line, consisting of superseded highway and collateral facilities.

    East Sonora Bypass

    Rte 108 in SonomaCaltrans plans to build a new 2-lane expressway from Sanuinetti Road to Standard Road near Sonora (Tuo PM R1.8 to R4.6), bypassing the current alignment. The proposal went before the CTC in November 2000 for $34.052M. Construction on this has started. In 2007, the CTC authorized using the Corridor Mobility Improvement Account (CMIA) to fund Stage 2 of the East Sonora Bypass ($17,233K requested).

    In October 2009, the CTC considered (but the issue was withdrawn) a project that will construct a 4-lane freeway replacing the existing 2-lane conventional highway currently known as Mono Way; construct interchanges near Fir Drive, Hess Avenue, and Standard Road; construct a new bridge over Sullivan Creek; and construct roadway improvements in the city of Sonora. This project is programmed in the Corridor Mobility Improvement Account and the 2008 State Transportation Improvement Program. Total estimated project cost is $65,920,000, capital and support. Construction is estimated to begin in Fiscal Year 2009-10. The scope as described for the preferred alternative is consistent with the project scope set forth in the approved project baseline agreement.

    In February 2010, the CTC approved for consideration of funding a project in Tuolumne County that will construct a 4-lane freeway replacing the existing 2-lane conventional highway currently known as Mono Way; construct interchanges near Fir Drive, Hess Avenue, and Standard Road; construct a new bridge over Sullivan Creek; and construct roadway improvements in the city of Sonora. This project is programmed in the Corridor Mobility Improvement Account and the 2008 State Transportation Improvement Program. The total estimated project cost is $65,920,000 for capital and support. Construction is estimated to begin in Fiscal Year 2009-10. The scope as described for the preferred alternative is consistent with the project scope set forth in the proposed project baseline agreement amendment (CMIA-PA-0910- 018, STIP Amendment 08S-067). A Final Environmental Impact Report (FEIR) has been prepared, as construction activities will occur in habitat areas of several endangered or threatened plant and animal species. The project will also cause impacts to visual, cultural, and riparian resources that will be mitigated by aesthetic treatments, establishing environmentally sensitive areas, and riparian restoration.

    In June 2010, the CTC revised the project scope for the East Sonora Bypass project. The baseline scope was to construct a 2-lane expressway from Peaceful Oak Road to Via Este Road, with a full interchange at Peaceful Oak Road. In June 2008, extensive analysis predicted that the baseline budget would be exceeded by $9.4 million (support and capital). A corrective action plan (CAP) committee developed and evaluated various corrective measures to stay within budget. The CAP committee recommended removing the westbound Peaceful Oak Road off-ramp and eastbound Peaceful Oak Road on-ramp from the project scope, and purchasing right of way for a two-lane expressway instead of a four-lane expressway. The deletion of the two ramps were stated as having minimal impact to travelers because there are nearby alternatives. The eastbound Peaceful Oak Road off-ramp and westbound Peaceful Oak Road on-ramp will remain in the project scope. The schedule was also revised; construction is expected to complete in December 2012 or early 2013.

    In June 2013, the CTC approved a project that will construct operational and safety improvements on Mono Way from Peaceful Oak Road to Via Este Road. This segment of Mono Way is currently Route 108, but it will be relinquished to Tuolumne County upon completion of the East Sonora Bypass Stage II project (PPNO 0021B); which is currently scheduled for construction completion in March 2014.

    In June 2014, the CTC authorized relinquishment of right of way in the county of Tuolumne on Route 108 (Mono Way) from Peaceful Oak Road to realigned Route 108 (East Sonora Bypass) consisting of superseded highway right of way, and along realigned Route 108 (East Sonora Bypass), consisting of collateral facilities. The County, by relinquishment agreement dated June 9, 2010, waived the 90-day notice requirement and agreed to accept title upon relinquishment by the State.

    In March 2016, it was reported that the Tuolumne County Transportation Council (Council) had requested that the CTC designate the Route 108 East Sonora Bypass Stage III and Peaceful Oaks Interchange projects as the local highway alternative projects to the rescinded 1968 Route 108 freeway alignment project. On June 18, 1968, the State of California and Tuolumne County entered into a Freeway Agreement for Route 108 from Fir Drive to west of Soulsbeyville Road. For several decades, parcels were acquired along the route for the future freeway project. In 1997, the Council, the Federal Highway Administration and the Department requested that the Commission rescinded the adopted Route 108 freeway alignment in favor of a new bypass route known as the East Sonora Bypass. Sections 14528.7 and 14528.8 of the California Government Code allows a county transportation agency to adopt a resolution to propose alternate highway projects and request the Commission approve allocation of proceeds from the sale of excess right of way along the rescinded route to alternate projects. Commission Resolution HRA 96-8 directs that the proceeds from the sale of excess right of way along the rescinded freeway alignment may be used for purchase of right of way along Stages 2 and 3 of the East Sonora Bypass project once Tuolumne County and Cities Area Planning Council adopts a resolution pursuant to Section 14528.7 of the Government Code. The Council has approved Resolution No.537-16 requesting the Commission approve the Route 108 East Sonora Bypass State III and Peaceful Oaks Interchange projects as alternate highway projects to the rescinded 1968 Route 108 freeway alignment project and request that the Commission allocate proceeds from the sale of excess right of way along the rescinded route to the alternate highway projects.

    In June 2017, it was reported that the project to construct as WB off-ramp and and EB on-ramp at Peaceful Oaks was scheduled to being in Summer 2019.
    (Source: Caltrans District 10 FB Page)

    The 2018 STIP, approved at the CTC March 2018 meeting, appears to adjust the allocation for PPNO 3048 Peaceful Oaks Rd Interchange ramps, TUO R4.3/R5.1, from $9.170M to $9.781M. The purpose of this project is to provide on and off ramps to the East Sonora Bypass Stage II project area at a critical interchange to improve accessibility for traffic, particularly emergency vehicles. Originally included in ESBII project but removed due to funding shortfalls. A related project is PPNO 0235 Mono Way op improvements (Rt 108 relinq), which is on former Route 180, TUO R4.0/R6.0, and in East Sonora, along Mono Way (Old Route 108), between Peaceful Oak Road and Via Este Road. Construct operational and safety improvements. Upon completion of East Sonora Bypass Stage II Project, this segment of Route 108/Mono Way will be relinquished to the County. This latter project was delayed to FY22-23.

    In January 2020, the CTC approved a resolution that $7,244,000 be allocated from the Budget Act of 2019, Budget Act Item 2660-301-0042 for construction and $1,669,000 for construction engineering, and $1,435,000 from Non-Budget Act Item 2660-501-0942 for PPNO 10-3048, ProjID 1013000104, EA 0Y210: 10-Tuo-108 R4.3/R5.1: Route 108 Peaceful Oaks Road/Route 108 Interchange Ramps. In East
    Sonora. At Peaceful Oaks Road. Construct a westbound off-ramp and eastbound on-ramp. It was noted that projects will be funded from proceeds of the sale of excess right of way originally purchased for the now-rescinded alignment for Route 108. The Tuolumne County Transportation Council is requesting to utilize $1,435,000 in Local Alternative Improvement Program (LATIP) funds for this allocation. (Deleted, March 2020) After funding the CONST increase of $807,000, this fund swap will result in $628,000 being returned to Tuolumne County shares. In March 2020, this allocation was adjusted to $11,783,000, as there was no return to Tuolumne County.
    (Source: January 2020 CTC Agenda, Agenda Item 2.5c.(9), March 2020 CTC Agenda, Agenda Item 2.5c.(7))

    The 2020 STIP, approved at the March 2020 CTC meeting, makes no changes to the $11,467K programmed for this project. It also makes no changes in PPNO 0235 Mono Way op improvements (Rt 108 relinq), which has 3,284K allocated in FY22-23.
    (Source: March 2020 CTC Agenda, Item 4.7, 2020 STIP Adopted 3/25/2020)

    Relinquishment of the segment in Tuolumne County from PM TUO R6.6 to PM TUO 9.7 (it is unclear if this is the current or a past routing) was up for relinquishement in January 2002.

    Naming Naming

    Tuolumne County Vietnam Veterans Memorial HighwayThe portion of Route 108 located in Tuolumne County is designated the "Tuolumne County Vietnam Veterans Memorial Highway." It was named in honor of the veterans from California that served in the Vietnam War. The State of California has the largest United States veteran population in the nation, comprised of some 3.3 million armed services veterans who represent 12.3 percent of the nationwide veteran population of nearly 27 million. More than 350,000 California veterans served in the Vietnam War, which resulted in 40,000 of them being wounded and 5,822 killed or missing in action, representing more than 10 percent of the nation's total casualties. In fact, more California residents died in the Vietnam War than residents of any other state, and more Californians received the Medal of Honor, the Bronze Star, and the Purple Heart than veterans of any other state. Named by Assembly Concurrent Resolution 17, Chaptered 7/8/2003, Chapter 89.
    (Image source: MyMotherLoad, 9/18/2019)

    Sonora and Mono Wagon RoadThe portion of this route from Sonora to US 395 was named the "Sonora and Big Meadows Wagon Road" by Senate Bill 289 in 1901. It was also named the "Sonora and Mono Wagon Road" by Resolution Chapter 11 in 1901, and extended by Resolution Chapter 510 in 1919.
    (Image source: Tuolumne County Historical Society)

    The portion of this route from Sonora to Long Barn has historically been called the "Long Barn to Sonora Road".

    Named Structures Named Structures

    Bridge 32-0008 (now 32-0067, TUO R002.78), at Sullivan Creek in Tuolumne county, is named the "Leslie G. Delbon Memorial Bridge". It was built in 1991, and named by Senate Concurrent Resolution 48, Chapter 105, the same year. Leslie G. Delbon, (d. 1990), as Manager and Chief Engineer of Tuolumne Water District number 2, oversaw the development and operation of a water, sewer and wastewater treatment system that serves a significant portion of the county.

    Business Routes Business Routes

    • Sonora: Mono Way, Route 49.
    • Twain Harte
    • Long Barn

Scenic Route Scenic Route

[SHC 263.6] Entire portion.

Freeway Freeway

[SHC 253.1] Entire route. Added to the Freeway and Expressway system in 1959.

Interregional Route Interregional Route

[SHC 164.15] From Route 132 in Modesto to Route 120 east of Oakdale, and between Route 120 at Yosemite Junction and Route 395.

Note: The portion from Route 132 in Modesto to Route 120 east of Oakdale was added by SB SB 532 (Chapter 189, 10/11/2009).

Other WWW Links Other WWW Links

Statistics Statistics

Overall statistics for Route 108:

Pre-1964 Legislative Route Pre-1964 Legislative Route

In 1933, Chapter 767 defined the route from [LRN 5] near Mission San Jose to [LRN 5] near Livermore. In 1935, defined LRN 108 as part of the highway code with that definition ([LRN 5] near Mission San Jose to [LRN 5] near Livermore).

In 1959, Chapter 1062 extended the route to terminate at "[LRN 75] near Brentwood".

This route ran from Route 9 (present-day Route 238) near Mission San Jose to Route 4 near Brentwood, and is roughly present-day I-680 between Route 238 and Route 84, and Route 84 from the I-680/Route 84 junction to Route 4.


Acronyms and Explanations:


Back Arrow Route 107 Forward Arrow Route 109

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