California Highways (www.cahighways.org): Route 260

Originally, this route was part of LRN 69, defined in 1933 (and signed as part of Sign Route 17). In 1947, LRN 69 was rerouted to the Nimitz Freeway routing, and "LRN 252" was extended through the addition of “the highway from San Leandro to Oakland via Alameda and the Posey Tube” (which “is part of [LRN 252]”). In 1949, the legislature realized their mistake, and added the LRN 252 segment to LRN 226. This made LRN 226:

A point in the vicinity of the intersection of Davis Street and East Fourteenth Street in San Leandro, thence via Davis Street through the City of San Leandro and through the City of Oakland via Bayshore Boulevard and Doolittle Drive, thence through the City of Alameda via Webster Street and Posey Tube and any other tube or crossing to be used in conjunction with Posey Tube, to [LRN 69] in Oakland near Seventh and Harrison Streets.
[LRN 69] near Seventh and Harrison Streets in Oakland to [LRN 5]

Segment 1 (later reworded as being from LRN 105 (unsigned Route 13, Fourteenth Street) in San Leandro to LRN 69 (Route 17; present-day I-880) in Oakland near Seventh and Harrison Streets via Alameda and the vicinity of the Oakland International Airport) became Route 260, Route 61, and Route 112, although it wasn't signed between 1947 and 1964. Segment 2 (later reworded to be from LRN 69 (Route 17; present-day I-880) near Castro Street in Oakland to LRN 5 (US 50; present-day I-580)) became I-980.

Webster Street Bridge ⇒ Jibboon Street Bridge

The Webster Street Bridge structure across the Oakland Estuary was erected in January 1926, a component of the Webster Street Bridge between Oakland and Alameda. This structure replaced a similar Pratt Truss swing structure that had been damaged by a ship impact in late 1925. The prior Pratt Truss at Oakland Estuary and the rest of the Webster Street Bridge was constructed in 1898.
(Source: Gribblenation Blog (Tom Fearer), "The Jibboom Street Bridge (former California State Routes 24, 70 and 99 at the American River)", 10/30/2025)

Before the Posey and Webster tubes were built, there were two small swing bridges between Oakland and Alameda for trains and automobile traffic. After the turn of the century, these bridges were struggling to bear the increase in commercial rail traffic and encountering conflicts with ships. Located on Webster and Alice streets, they opened 12 times a day in 1900. By 1906 that number had increased to 60. The Webster bridge was later incorporated into Sacramento’s Jibboom Street Bridge (which was part of Sign Route 24). Built in 1928, the Posey Tube solved that problem. Engineered by George Posey, the Posey Tube was the widest in the world and it was built using an innovative method. Most tunnels back then were constructed from a steel shell later filled with concrete. To build the Posey Tube, construction crews floated concrete tunnel pieces on a barge in the estuary to precise locations before sinking and connecting them. Only London, New York, and Philadelphia had large tunnels built this way back then. The portals were designed by architect Henry Meyers, who’s known for designing Highland Hospital, the Veterans Memorial Building, and the Caldecott Tunnel as well. The quintessential Art Deco Oakland portal structure was kind of an influencer of this area. The parallel Webster Street Tube wasn’t built until the 1960s. The construction alleviated traffic in the Posey Tube, which used to carry cars in both directions. Now Posey goes from Alameda to Oakland, and Webster takes Oakland traffic into Alameda.
(Source: Oaklandside, 7/24/2024)

In October 1928, the Posey Tube (future Route 260) would open at Oakland Estuary as a replacement for the bridges located at Webster Street and Harrison Street. The Pratt Truss part of the structure was hauled via barge to Antioch, where it would remain until was purchased by Sacamento County. During August 1929, Sacramento County contracted to have the Webster Street Bridge moved to the American River. The structure would be hauled through the Sacramento River Delta to the confluence of the American River and Sacramento River during March 1930. The structure would open to traffic during 1931 as an extension of Jibboom Street out of the city of Sacramento. The Jibbom Street Bridge structure connected Jibboom Street in Sacramento to Garden Highway north of the American River.
(Source: Gribblenation Blog (Tom Fearer), "The Jibboom Street Bridge (former California State Routes 24, 70 and 99 at the American River)", 10/30/2025)

In 1935, the Jibboom Street Overhead was announced as a recommended project. The proposed span would serve as a connection between Jibboom Street and the I Street Bridge. Concepts of the Jibboom Street Overhead noted that the project was planned as a Federal cooperative and included a replacement for the original eastern approach to the I Street Bridge. The original eastern approach landed at I Street just west of 2^nd Street. The new approach was planned to be elongated towards 3^rd Street. Jibboom Street originally connected to 2^nd Street via an at-grade crossing of the Southern Pacific Railroad. The Jibboom Street Overhead and realigned eastern approach to the I Street Bridge were dedicated by the Governor on October 1, 1937. In 1949, Legislative Chapter 1467 defined a duplicate LRN 207 as a new State Highway between Sacramento and Marysville; this highway incorporated the Jibboom Street Overhead branching north of the I Street Bridge. The corridor was originally subject to the provisions of the Collier Burns Act of 1947 regarding maintenance. The duplicate LRN 207 was renumbered as LRN 232 in 1951; the Collier Burns Act provision the highway was subject to was removed in 1955. Sign Route 24 would continue to use the I Street Bridge until it was realigned onto the Jibboom Street Bridge (LRN 232) in 1960.
(Source: Gribblenation Blog (Tom Fearer), "I Street Bridge (former California State Route 16 the Sacramento River)", 10/24/2025)

After 1964, Route 99 was defined as running through Sacramento and Route 70 was originally signed to terminate at Capitol Mall. Route 99 and Route 70 would initially use the eastern I Street Bridge approach to reach the Jibboom Street Overhead. These were temporary routings. In 1970, following the completion of I-5 north of downtown Sacramento during the late 1960s, both Route 99 and Route 70 were moved to I-5 and would multiplex the freeway.
(Source: Gribblenation Blog (Tom Fearer), "I Street Bridge (former California State Route 16 the Sacramento River)", 10/24/2025)

In 1969, the northern timber trestle on the Jibboom Street Bridge was rebuilt as a concrete structure. This rendered the structure no longer able to utilize turntable span. Access from the bridge to Garden Highway was later severed to make way for additional parking in Discovery Park (founded in 1960).
(Source: Gribblenation Blog (Tom Fearer), "The Jibboom Street Bridge (former California State Routes 24, 70 and 99 at the American River)", 10/30/2025)

The Posey portals are essentially massive machines on the inside. The portals contain eight huge fans that have been running for 96 years. Four are blowers, pushing fresh air down under the roadway. The other four are exhausters, sucking out the polluted warmer air that’s risen up above the traffic. It’s discharged through windows at the top of the building. There are similar sets of fans in Alameda’s portal building. There is always one exhauster and one blower running in the Oakland portal. But after 24 hours they’ll automatically switch off and another pair will get a turn. The power is supplied by Alameda but automatically switches to Oakland if there’s an outage. Because there’s far less traffic at night, that’s when a lot of the maintenance happens—a big truck outfitted with brushes comes through and scrubs the tubes clean.
(Source: Oaklandside, 7/24/2024)

Although a distinct route from Route 61, this route is signed in its entirety as Route 61.

Route 880 Oakland/Alameda Access, Broadway-Jackson, Improvement (04-Ala-260 R0.78/R1.90, 04-Ala-880 30.47/31.61)

Oakland-Alameda Access Project Caltrans, in partnership with the Alameda County Transportation Commission (Alameda CTC), proposes to improve mobility and accessibility, traffic operations, and bicycle and pedestrian facilities through the Oakland Alameda Access Project (proposed project) on Route 260 (R0.78/R1.90) and on I-880 (30.47/31.61) in the cities of Oakland and Alameda in Alameda County, California. The EIR for the project notes that the Oakland Alameda Access Project, formerly known as the Broadway/Jackson Interchange Project and then the Broadway/Jackson Street Interchange Improvements Project, has been studied for over 20 years. As of September 2020, three Project Study Reports (PSR), a Project Report (PR), and a Feasibility Study evaluated numerous alternatives to address the Purpose and Need. A Draft PSR was prepared in 1997, a subsequent PSR was completed in 2000, and a PR was completed in 2002 for the Broadway/Jackson Street Interchange Improvements Project. However, the recommended alternative did not have the support of the local community, particularly key stakeholders in Chinatown, so it did not proceed. In 2006, the City of Alameda revisited the project by completing a Feasibility Study for the I-880/Broadway-Jackson Interchange Improvements Project. The Feasibility Study recommended several new alternatives and a PSR-Project Development Support (PDS)-Project Initiation Document (PID) for the I-880/Broadway-Jackson Interchange Improvements Project. This study was approved by Caltrans in March 2011.
(Source: Draft Environmental Impact Report/Environmental Assessment and Draft Individual Section 4(f) Evaluation, Oakland Alameda Access Project, September 2020)

The September 2020 Draft EIR notes the following alternatives:
(Source: Draft Environmental Impact Report/Environmental Assessment and Draft Individual Section 4(f) Evaluation, Oakland Alameda Access Project, September 2020)

No-Build (No-Action) Alternative. Under the No-Build Alternative, there would be no improvements to bicycle or pedestrian connectivity or safety. Freeway traffic to/from the cities of Oakland and Alameda would continue to use city streets through Oakland and Chinatown, which are areas with a high volume of pedestrian activity. Vehicle-pedestrian or -bicycle conflicts from traffic traveling through city streets would continue. The I-880 viaduct would continue to impede connectivity between downtown Oakland and the Jack London District, and access would not be improved for bicyclists and pedestrians traveling between Oakland and Alameda.
Build Alternative. The Build Alternative proposes to remove and modify the existing freeway ramps and to modify the Posey Tube exit in Oakland. The Build Alternative would improve access to NB and SB I-880 from the Posey Tube via a right-turn-only lane from the Posey Tube to 5^th Street, and a new horseshoe connector at Jackson Street below the I-880 viaduct that would connect to the existing NB I-880/Jackson Street on-ramp. The proposed project would also reconstruct and shift the existing WB I-980/Jackson Street off-ramp to the south. The Webster Tube entrance at 5^th Street and Broadway would be shifted to the east to create more space for trucks to make the turn from Broadway into the Webster Tube. A bulb-out would be constructed to extend the sidewalk, reducing the crossing distance and allowing improved visibility of pedestrians on the southeast corner. The proposed project would remove the NB I-880/Broadway off-ramp and widen the NB I-880/ Oak Street off-ramp to 6^th Street, which would become the main NB I-880 off-ramp to downtown Oakland and to Alameda. 6^th Street would become a one-way through street from Oak Street to Harrison Street and a two-way street from Harrison Street to Broadway. The proposed project would add a Class IV two-way cycle track on 6^th Street between Oak and Washington streets and on Oak Street between 3ʳᵈ and 9^th streets. It would implement bicycle and pedestrian improvements at the Tubes’ approaches in Oakland and Alameda, and it would open the Webster Tube’s westside walkway. This would improve connectivity to existing and future planned bicycle paths in the City of Oakland, and it would implement various “complete streets” improvements to create additional opportunities for non-motorized vehicles and pedestrians to cross under I-880 between downtown Oakland and the Jack London District.

Additional detail on the Build Alternative improvements include the following:
(Source: Draft Environmental Impact Report/Environmental Assessment and Draft Individual Section 4(f) Evaluation, Oakland Alameda Access Project, September 2020)

Construction of a new horseshoe connector under I-880 at Jackson Street. Vehicles exiting the Posey Tube would have direct access to NB I-880 via the proposed horseshoe connector. Vehicles heading to NB and SB I-880 would use the right-turn-only lane at the Posey Tube exit to turn onto eastbound 5^th Street. Access to a new horseshoe connector would be provided from the left side of 5^th Street, and it would loop below the I-880 viaduct to connect to the existing NB I-880/Jackson Street on-ramp. Traffic heading to SB I-880 would continue eastbound on 5^th Street to the SB I-880/Oak Street on-ramp. Construction of the new right-turn-only lane onto 5^th Street would require new retaining walls along the right side of the Posey Tube exit replacing the historic Posey Tube wall. The horseshoe connector would provide a direct route between the Posey Tube and NB I-880/eastbound (EB) I-980 and SB I-880. A new left-turn pocket to accommodate the turn onto 6^th Street would be constructed requiring removal of a section of the historic Posey Tube western exit wall.
Reconstruction of the existing WB I-980/Jackson Street off-ramp. To provide space for unimpeded movement from the Posey Tube to the new horseshoe connector, the WB I-980/Jackson Street off-ramp would be realigned to the south. The realigned off-ramp would touch down at-grade on 5^th Street at the Alice Street intersection. Off-ramp and 5^th Street traffic would continue to be separated by a landscaped median past the condominium building at 428 Alice Street. 5^th Street would be converted to a two-way street to accommodate condominium residents, allowing vehicles to turn left or right onto 5^th Street.
Removal of the existing NB I-880/Broadway off-ramp viaduct structure including the bridge deck and supporting columns. Removing the NB I-880/Broadway off-ramp structure would provide the space for complete streets improvements on 6^th Street. It would also restore an element of the City of Oakland’s street grid system by providing a continuous 6^th Street between Oak Street and Broadway. This would provide for a more efficient street network, and it would allow traffic to be more evenly distributed on Oakland city streets. Also, it would improve traffic operations at the Broadway / 6^th Street and Broadway/5^th Street intersections by eliminating the stream of traffic exiting the Broadway off-ramp and heading to the Webster Tube entrance. Instead, this traffic would use 6^th Street and turn left at Webster Street to access the Webster Tube.
Widening of the NB I-880/Oak Street off-ramp. The existing Oak Street off-ramp would be widened from a one- to a two-lane exit by restriping the NB I-880 mainline and reconfiguring the ramp terminus. At the Oak Street intersection, the ramp would be further widened from one left-turn-only pocket lane, one through and left-turn lane, and one through and right-turn lane to provide one left turn-only (SB) pocket lane, one through (WB) lane, one through (WB) and right-turn (NB) lane, and one right-turn-only (NB) lane. Two new retaining walls would be constructed along the widened ramp’s new edge of shoulder. In advance of the Oak Street exit, NB I-880 would be restriped from four to five lanes, including a standard 1,400-foot-long auxiliary lane to accommodate the additional traffic resulting from the Broadway off-ramp removal.
Modification of 5^th Street/Broadway access to the Webster Tube. The 5^th Street/Broadway entrance to the Webster Tube would be moved slightly east. Also, the 5^th Street crosswalk on the east side of Broadway would be shifted east and considerably shortened, and the signal phasing would be modified to include a pedestrian-led signal phase for eastbound pedestrian traffic.
Construction of a new through 6^th Street connecting Oak Street to Broadway. Improvements to 6^th Street would be accomplished by turning the street into a one-way street in the westbound direction from Oak Street to Harrison Street and a two-way street from Harrison Street to Broadway. The lanes would be a minimum of 11 feet wide. There would be a minimum of two through lanes with additional turn pockets at intersections in the westbound direction. There would be one lane in the eastbound direction from Harrison Street to Broadway. A new sidewalk would be constructed along the south side between Broadway and Oak Street. Segments of the existing sidewalk along the north side between Oak Street and Broadway would be reconstructed to a minimum of 10 feet wide between Harrison and Alice streets to provide continuity for pedestrians. A continuous Class IV two-way cycle track would also be provided between Oak and Washington streets. Parking spaces would be provided along portions of this roadway.
Construction of a two-way bicycle/pedestrian path and walkway from Webster Street in Alameda to 6^th Street in Oakland through the Posey Tube and from 4^th Street in Oakland through the Webster Tube to Mariner Square Loop in Alameda. The path would begin at Webster Street and Constitution Way in Alameda, would continue through the Posey Tube on the existing east side walkway, and would exit the Tube via a new ramp with a hairpin turn at 5^th Street. The path in Alameda connecting to the Posey Tube would be realigned and widened. The path in Oakland would wrap around the back of the Portal building on 4^th Street and continue onto Harrison Street. It would continue onto a Class I two-way bicycle/pedestrian path under I-880 just west of Harrison Street and connect to the Class IV two-way cycle track on 6^th Street between Oak and Washington streets. The new bicycle and pedestrian ramp exit from the Posey Tube would require removal of the existing historic Posey Tube staircase to provide street level Americans with Disabilities Act (ADA) compliant access from the Tube. The proposed project would improve access between Oakland and Alameda by opening the Webster Tube maintenance walkway to bicycle and pedestrian travel. The walkway would connect to the proposed path under I-880 at 4^th Street (near the Posey Tube Portal building). It would continue onto 4^th Street to Webster Street, and it would turn north through the existing parking lot on the west side of the Webster Tube entrance before making a hairpin turn to connect to the westside walkway inside the Tube. On the Alameda side, the walkway would connect to existing bicycle and pedestrian facilities at Mariner Square Loop and Willie Stargell Avenue. The existing sidewalk within Neptune Park would be widened to match the proposed sidewalk to the north. Improvements inside the Tube would include widening the existing walkway, upgrading the existing railings, and relocating call boxes and fire extinguishers.
Modification of 5^th, 7^th, Madison, Jackson, Harrison, Webster, Oak, and Franklin streets. The street modifications would include replacing the dual right turns at the 7^th Street/Harrison Street intersection with a single right-turn-only lane and removing the free right turn (where the island allows cars to turn right without stopping) at the 7^th Street/Jackson Street intersection. These would no longer be needed because Alameda traffic bound for NB/SB I-880 would be better served by the right turns from the Posey Tube to 5^th Street. With the removal of the free right turns, vehicles would observe the traffic signal before turning right. With the curb extension proposed at this location, the pedestrian crossing distance would be shortened, which would decrease vehicle-pedestrian conflicts. In addition, a Pedestrian Hybrid Beacon (PHB) beacon would be installed on 7^th Street across the street from the Chinese Garden Park. There would also be restrictive right-turn movements to reduce bicycle and vehicle conflicts at the 5^th/Broadway, 6^th/Webster, 6^th/Harrison, 6^th/Jackson, 6^th/Madison, 5^th/Jackson, 8^th/Oak, and 7^th/Oak intersections. A continuous sidewalk would be installed along the perimeter of Chinese Garden Park. Additional improvements, including landscaping, could occur adjacent to the southern boundary of the park and would be coordinated through the City of Oakland. Jackson Street between 5^th and 6^th streets would be converted from two- to one-way travel in the northbound direction, and it would include an emergency-only access lane.

In December 2020, it was reported that a plan that has been decades in the works to reconfigure the ramps of I-880 in Oakland’s Chinatown — and which thousands of Alameda commuters use daily — to help ease traffic congestion is moving forward. Known as the Oakland Alameda Access Project, the plans for around Interstate 880 include the creation of a right-turn-only lane onto Fifth Street at the exit of the Posey Tube, which carries traffic from Alameda into Oakland, to provide almost direct access to the freeway both north and south. The project also calls for widening the interstate’s northbound Oak Street off-ramp and removing the northbound Broadway off-ramp. Madison Street will be restriped to allow for two-way travel between Fourth and Sixth streets. It currently is one-way for traffic traveling west. Jackson will be restriped for one-way travel between Fifth and Sixth. The changes also include increasing the width of a maintenance walkway in the Webster Tube, which carries traffic from Oakland under the Oakland Estuary into Alameda, from three to four feet to better support pedestrians and cyclists. Work on the $120 million project by the Alameda County Transportation Commission is expected to begin in the middle of 2023 and be finished in three years. Other parts of the plan include new sidewalks on Fifth and Sixth streets in Oakland, a sidewalk that encircles the Chinese Garden Park on Seventh Street in Chinatown, and a two-way bicycle path on Oak and Sixth streets in Oakland. To learn more about the project, review the draft environmental document and submit comments, go to www.OaklandAlamedaAccessProject.com.
(Source: East Bay Times, 12/8/2020)

In June 2021, the CTC approved amending the STIP to use the funding available through the 2021 Mid-Cycle STIP and share distribution of the federal Coronavirus Response and Relief Supplemental Appropriations Act of 2021 funds (COVID Relief Funds) to add a new project to the STIP: Route 880 Oakland/Alameda Access, Broadway-Jackson, Improvement (PPNO 0044D) and program $50K to the PS&E phase in FY 2022-23.
(Source: June 2021 CTC Agenda, Agenda Item 2.1a.(19))

In May 2022, the CTC approved for future consideration of funding the following project: 04-Ala-880, PM 30.47/31.61; 04-Ala-260, PM R0.78/R1.90. Oakland Alameda Access Project. Improve connectivity and accessibility between Alameda and I-880 by way of Route 260 in Alameda County. (FEIR) (PPNO 0044D) (STIP) The project is located on I-880 between postmile R30.47 and R31.61 and along Route 260 between postmile R0.78 and R1.90 in Alameda County. The proposed project would improve multimodal safety for all users and reduce conflicts between regional and local traffic by enhancing bicycle and pedestrian accessibility and connectivity. It would also improve mobility and accessibility between I-880 and Route 260, the City of Oakland downtown neighborhoods and the City of Alameda, and reduce freeway-bound regional traffic and congestion on local roadways and area neighborhoods. This project is currently programmed in the 2020 State Transportation Improvement Program (STIP) for a total of $127,728,000, which includes Right of Way (capital and support). Construction is estimated to begin in 2024-25. The scope, as described for the preferred alternative, is consistent with the project scope as programmed by the Commission in the 2020 STIP. Under the Build Alternative, access to northbound and southbound I-880 from the Posey Tube would be improved by adding a right-turn-only lane from the Posey Tube to 5^th Street and a new horseshoe connector at Jackson Street below the I-880 viaduct that would connect to the existing northbound I-880/Jackson Street on-ramp. The Build Alternative would also include a two-way bicycle/pedestrian walkway through the Posey Tube. The construction of a right-turn-only lane from the Posey Tube Approach to 5^th Street would modify the Tube in Oakland by demolishing 175 feet of the eastern Approach wall and staircase for a new turn lane onto 5^th Street. The Approach’s extant straight wall would be replaced by a new curved wall that would extend onto 5^th Street. The construction of the left-turn-only lane from the Posey Tube exit to 6^th Street would modify the Tube by demolishing 93 feet of the Oakland Approach’s western wall, including the existing western pylon base. The Approach’s existing straight walls would be replaced by new walls that would extend onto 5^th Street and 6^th Street, respectively. There likely will not be sufficient room under the I-880 viaduct to relocate the existing western pylon base at the end of the proposed western wall. Relocation options will be evaluated following additional data collected during the project’s design phase. The eastern pylon base will be preserved in place and stabilized as part of this project. The demolition of the Approach’s eastern wall and stairs, the demolition of the western wall including its pylon base, the construction of the new wall with a different configuration, and the construction of the bicycle/pedestrian ramp around the Portal building would result in the partial removal of, physical destruction of, or damage to this historic property under 36 CFR 800.5(a)(2)(i) and (ii). A two-way bicycle/pedestrian accessible ramp would be installed at the Posey Tube’s Oakland exit. This ramp would replace the existing staircase attached to the Oakland Approach’s eastern wall, and would transition to an at-grade path that wraps around the Oakland Portal building. The path would replace the existing concrete sidewalk and curb on the west (4th Street) side of the building. The construction of the bicycle/pedestrian walkway at or near the Portal building would result in the partial removal of, physical destruction of, or damage to this historic property under 36 CFR 800.5(a)(2)(i) and (ii).
(Source: May 2022 CTC Agenda, Agenda Item 2.2c.(8))

In January 2023, the CTC amended the Local Partnership Formulaic Program to add the Oakland Alameda Access Project in Alameda County (04-Ala-260 R0.78/R1.90, 04-Ala-880 30.47/31.61) and program $196,000 in fiscal year 2022-23. This project will provide active transportation facilities, pedestrian and bicyclist safety enhancements, realignment of offramps and onramps to address circulation issues, as well as other roadway improvements. The anticipated benefits of this project include improved multimodal mobility and accessibility between the cities of Oakland and Alameda and easing local roadway congestion around I-880 and Route 260.
(Source: January 2023 CTC Agenda, Agenda Item 4.10)

In March 2023, the CTC approved the following allocation for a locally-administered STIP project: $50,000. 04-Ala-880 R30.47/R31.61. PPNO 04-0044D; ProjID 0400000326; EA 0G360. Oakland Alameda Access Project. Project is located on I-880 and Route 260 between 5^th Avenue Overhead and 5^th and 6^th Street Viaduct within the Cites of Oakland and Alameda in Alameda County. The project proposes to improve access along I-880 and in and around the Webster and Posey Tubes (Route 260 tunnels under the Oakland Estuary [Tubes]), downtown Oakland, and the City of Alameda. Proposed improvements also include implementation of follow up landscaping work to restore removed vegetation required by the highway improvements. CEQA - EIR, 08/20/2021. NEPA - FONSI, 08/20/2021. Future consideration of funding approved under Resolution E-22-36; May 2022. Contribution from other sources: $12,000,000. Allocation: PS&E $50,000.
(Source: March 2023 CTC Agenda, Agenda Item 2.5c.(2) #2)

In June 2023, the CTC approved the following allocation for a locally-administered LPP (Formulaic) project: $196,000. 04-Ala-880 R30.47/R31.61. PPNO 04-0044D; ProjID 0400000326; EA 0G360. Oakland Alameda Access Project. Project is located on I-880 and Route 260 between 5^th Avenue Overhead and 5^th and 6^th Street Viaduct within the Cites of Oakland and Alameda in Alameda County. The project proposes to improve access along I-880 and in and around the Webster and Posey Tubes (Route 260 tunnels under the Oakland Estuary [Tubes]), downtown Oakland, and the City of Alameda. Proposed improvements also include implementation of follow up landscaping work to restore removed vegetation required by the highway improvements. CEQA - EIR, 08/20/2021. NEPA - FONSI, 08/20/2021. Future consideration of funding approved under Resolution E-22-36; May 2022. Allocation: R/W $196,000.
(Source: June 2023 CTC Agenda, Agenda Item 2.5s.(2) #1)

In October 2023, the CTC approved the following amendment request for the Local Partnership Program: The Alameda County Transportation Commission requests to amend the Oakland Alameda Access Project in Alameda County and add $7,281,000 of its available 2022 Formulaic Program funding to the Construction phase in fiscal year 2024-25. This project was programmed at the January 2023 Commission meeting with 2020 Formulaic Program funds to the Right-of-Way phase. This project will remove and modify existing freeway ramps, modify the connection from the Posey Tube (Route 260) to I-880, construct Class IV two-way cycle tracks in Oakland, and implement bicycle and pedestrian improvements near the Posey Tube and the Webster Tube. The anticipated benefits of this project are enhanced safety, reduction in greenhouse gas emissions, and providing multimodal choices for travelers.
(Source: October 2023 CTC Agenda, Agenda Item 4.26)

In December 2024, the CTC approved an allocation of $67,625,000 for the STIP/SB 1 Local Partnership Program (Competitive and Formulaic) Oakland Alameda Access Project: 04-Ala-260 R0.78/R1.90, 04-Ala-880 R30.47/R31.61. PPNO 04-0044D; ProjID 0400000326; EA 0G360. Oakland Alameda Access Project. Project is located on I-880 and Route 260 between 5^th Avenue Overhead and 5^th and 6^th Street Viaduct within the Cites of Oakland and Alameda in Alameda County. The project proposes to improve access along I-880 and in and around the Webster and Posey Tubes (Route 260 tunnels under the Oakland Estuary [Tubes]), downtown Oakland, and the City of Alameda. Proposed improvements also include implementation of follow up landscaping work to restore removed vegetation required by the highway improvements. CEQA - EIR, 08/20/2021; Re-validation 10/07/2024. NEPA - FONSI, 08/20/2021; Re-validation 10/07/2024. Future consideration of funding approved under Resolution E-22-36; May 2022. Right of Way Certification: 10/14/2024. Contribution from other sources: $51,375,000. As part of this allocation request, the implementing agency is requesting to extend the completion of CONST an additional 6 months beyond the 36 month deadline. Allocation: RIP/24-25: CON ENG $18,000,000; CONST $17,344,000; LPP-C/24-25: CONST $25,000,000; LPP-F/24-25 CONST $7,281,000.
(Source: December 2024 CTC Agenda, Agenda Item 2.5s.(4))

In June 2025, the CTC approved for future consideration of funding 04-Ala-880, PM 30.47/31.61; 04-Ala-260, PM R0.78/R1.90; PPNO 04-0044D. Oakland Alameda Access Project. Improve connectivity and accessibility between Alameda and I-880 by way of Route 260. The Department, in partnership with Alameda County Transportation Commission, proposes to improve mobility and accessibility. Specifically, the project will improve motorist, pedestrian, and bicycle safety, reduce conflicts between regional and local traffic, and enhance bicycle and pedestrian accessibility and connectivity within the project area by removing and modifying existing freeway ramps, modifying the connection from the Posey Tube to I-880, constructing Class IV two-way cycle tracks in Oakland, implementing various related "complete streets" improvements, implementing bicycle and pedestrian improvements at the approaches to the Tubes, and opening the Webster Tube's westside walkway to bicyclists and pedestrians. The project is currently programmed in the 2024 State Transportation Improvement Program (STIP). The total programmed amount, which includes Right of Way (Support and Capital) and Construction (Support and Capital) is $151,917,000 in STIP, Regional Improvement Program (RIP), and Senate Bill 1 (SB 1) Local Partnership Program (LPP) (Formulaic). Construction began in Fiscal Year 2024-25. The scope, as described for the preferred alternative, is consistent with the project scope as programmed by the Commission in the 2024 STIP. The Commission accepted the FEIR and approved the project for future consideration of funding on May 18, 2022, under Resolution E-22-36. Since the approval of the FEIR, there have been changes to the project and an Addendum was prepared pursuant to the California Environmental Quality Act (CEQA). Specifically, the Addendum addresses minor design modifications, including overhead and roadside signage, minor changes in permanent maintenance easements, retaining wall modifications, Americans with Disabilities Act (ADA)- compliant curb ramps, pavement rehabilitation and associated improvements, driveway access control modifications, raised cycle track, crosswalk and sidewalk modifications, modifications to median and sidewalk landscaping, changes to proposed utility undergrounding and relocations, changes in tree removal and on-street parking, and conversion of a Harrison Street segment from bidirectional traffic to one-way traffic. The modifications expand the project footprint within I-880 right-of-way (ROW) and on some local streets. There is no change to the construction duration. The design modifications expand the project footprint mostly within the I-880 ROW to accommodate signage and on some local streets where proposed ADA-compliant curb ramps, pavement rehabilitation, sidewalks, and other improvements would occur. Resources in the project area that may be impacted by the project include cultural resources. Potential impacts associated with the project can all be mitigated to below significance with the exception of cultural resources, for which a Statement of Overriding Considerations was prepared. In accordance with CEQA Guidelines Section 15162, no Subsequent FEIR is required for the project because new information and changes in circumstances, project description, impacts, and mitigation are not substantial and do not involve new significant impacts or a substantial increase in the severity of previously identified impacts. As a result, the Department completed an Addendum to the FEIR pursuant to CEQA.
(Source: June 2025 CTC Agenda, Agenda Item 2.2c.(4) #1)

In June 2025, the CTC approved the following Allocation Amendment for a Multi-Funded STIP and Senate Bill 1 LPP (Formulaic and Competitive) Project to amend the postmiles for the project: 04-Ala-260 R0.78/R1.90, 04-Ala-880 ~~R30.47/R31.61~~ 29.36/R31.6. PPNO 04-0044D; ProjID 0400000326; EA 0G360. Oakland Alameda Access Project. Project is located on I-880 and Route 260 between 5^th Avenue Overhead and 5^th and 6^th Street Viaduct within the Cites of Oakland and Alameda in Alameda County. The project proposes to improve access along I-880 and in and around the Webster and Posey Tubes (Route 260 tunnels under the Oakland Estuary [Tubes]), downtown Oakland, and the City of Alameda. Proposed improvements also include implementation of follow up landscaping work to restore removed vegetation required by the highway improvements.
(Source: June 2025 CTC Agenda, Agenda Item 2.5s.(6))

In March 2026, the CTC adopted the 2026 STIP, which included the following as continued programming from 2024: PPNO 04-0044D, “Rt 880, Oakland/Alameda Access, Broadway-Jackson (LPP-C)”. Prior years programming ($ × 1000): $35,344 ($17,344 CONST; $18,000 CON SUP). No FY26-27+ funds programmed.
(Source: March 2026 CTC Agenda, Agenda Item 4.4; 2026 STIP Staff Recommendations Adopted 2/27/2026)

In March 2026, it was reported that a $175 million plan to overhaul traffic between Alameda and Oakland has the goal of redirecting thousands of cars away from Chinatown streets long plagued by pedestrian deaths, congestion and poor air quality. The first stage of the project will remove a freeway exit and redirect thousands of cars away from Chinatown streets while expanding bike and pedestrian routes. The I-880 Broadway exit will be demolished to “reduce regional traffic” while pedestrian and bike routes will be widened between Alameda’s Mariner Square loop, the Webster Tub and Chinatown. While these changes could benefit Jack London Square and the businesses it hosts, construction will temporarily close the Posey and Webster tubes during the three-year project. The Posey Tube exit with I-880 will be rerouted away from Chinatown via a new “horseshoe” that threads underneath support columns for I-880 and moves drivers to a new on-ramp. The Broadway off-ramp will be demolished and the Oak Street off-ramp will be widened, according to planning documents. Caltrans estimates the new route will reduce traffic by 13,529 cars each day from the Posey Tube through Harrison Street, representing a nearly 50% drop in traffic volume. The second stage pivots to creating new traffic flows on numerous Oakland streets, including restriping Madison Street for two-way travel and restriping Jackson Street for one-way travel underneath I-880. The Webster Tube detour will reroute motorists southbound along I-880 to cross into Alameda along the Park Street Bridge. Caltrans is attempting to mitigate the effect of these closures on residents and businesses by operating Sunday through Thursday between 10 p.m. and 6 a.m. during a six-month period of the first phase of the project. Designers hope that upon completion, the project will increase active transportation like walking and biking between the neighborhoods.
(Source: Mercury News, 3/14/2026)