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From Route 880 near 42nd Avenue to a connection with Route 580 near High Street in Oakland.
Route 77 was not allocated as part of the original signage of state highways in 1934. This segment was a proposed route in 1963, and was LRN 233, defined in 1953, but was renumbered as LRN 235 in 1957.
According to Chris Sampang on AAroads:
(Source: Chris Sampang on AAroads, "Re: CA 77", 3/4/2019)
Looking at Historic Aerials (coordinates 37.76647, -122.21208), the Route 77/Route 17 (now I-880) interchange used to be a full system interchange (likely in anticipation of the eastward extension towards the MacArthur Freeway and to Orinda etc. that never happened). The ramps (and for that matter, the 42nd Avenue freeway itself) first show up on their aerial photos ca. 1958, curiously with the southbound offramp from the Nimitz Freeway/Route 17 coming off on the left side. By 1968, this was replaced with a more standard semi-directional ramp from the right-hand side southbound. The current diamond interchange with Route 77 was installed sometime between 2010 and 2012. In some ways this explains the reason the exit was signed for High Street all these years, even though direct access from southbound I-880 to High Street was only created in 2012: a driver would have to get onto eastbound Route 77 and then take the only offramp to East 12th/High intersection to access High Street itself. The only vestige of the old semi-directional T remaining is the now superfluous ramp from High Street to I-880 north that allows one to skip over the stoplight at Route 77 and Coliseum Way: prior to 2012, the left lane served as an onramp from High to eastbound Route 77, with the flyover being the only access to the northbound Nimitz.
For a period before 2008, Route 77 between I-880 and post mile 0.45 was signed as Route 185. As of 2008, that segment has been resigned as Route 77. In terms of constructed length, this route is the shortest in the state system, beating Route 283 by 10 feet. There's a nice blog with pictures of this short segment; Tom Fearer also covers the highway in his Feb 2019 Gribblenation Blog California State Route 77; the real "Shortest Signed" State Highway.
The route is unconstructed between Route 185 and Route 580. This was originally signed as Route 185 from Route 185 to I-880 via 42nd Avenue in Oakland; however, as of August 2008, it was signed as Route 77. Note that this signage is of the form of signs on the structures; it appears there are no reassurance markers. It follows the High Street corridor (including the portion that is Route 185) between I-880 and I-580. The constructed portion may be to freeway standards. The portion of High Street may be local traversable highway, not state maintained. As of 2002 the portion on 42nd Avenue was local traversable highway, but the 2008 signage might signal assumption of state maintenance.
As of 2008, some work has (re)started on the Isabel Avenue ramp to I-580
Note: 25th Ave does not go far enough north to meet I-580. 35th Ave, however, is the next exit up on I-580 from High St (segment 1) and turns into Redwood Rd (segment 2) at Jordan Rd. So there might be a typo in the route definition.
From Route 580 in Oakland to Route 24 near Lafayette.
In 1973, Chapter 447 changed the terminus of the segment to be “Route 24 near Lafayette.”
Until 1973, segment (2) ended at Route 242. In 1973, the portion from Route 24 to Route 242 was deleted. At Taylor Boulevard and Pleasant Hill Road in Walnut Creek, there is a Y interchange. As Taylor Boulevard corresponds to the (pre-1973) extension of Route 77 to Route 242, this interchange might have been built in anticipation of the never-built extension. The deleted portion includes Taylor Boulevard (and its interchange with Pleasant Hill Road), Sunvalley Boulevard (between former Route 21 and I-680 at the Sun Valley Mall), and Willow Pass Road to Route 242.
The route would have run through Shepherd Canyon. Originally, the
Sacramento Northern Railroad ran an electrified route through the hills,
with a tunnel at Gunn Drive. After the tunnel was sealed off in 1957,
Caltrans then proposed a route through the area. Caltrans projected a
daily traffic count of 100,000 vehicles per day by 1990. After extensive
opposition, the plan was withdrawn in 1972.
(Source: "The Highway That Never Was" (a website Mark Roberts once had))
Preliminary studies were completed in 1956 covering the location for this future freeway. On December 19, 1956, after various public meetings and a hearing before the Highway Commission, the last gap in the route was adopted and declared a freeway. This future facility will consist of initially four lanes, future six lanes, and starting at the Mountain Boulevard Freeway in Oakland, will traverse Shepherd Canyon and tunnel some 1,400 feet through the Oakland hills. It will span the Redwood Canyon in Contra Costa County and traverse the range of hills easterly thereof entering and crossing the Moraga Valley just north of the present town site. It traverses close to St. Mary's College and terminates at a junction with Route 24 at Pleasant Hill Road. This would have been called the Shepherd Canyon Freeway.
Route 77 was not allocated as part of the original signage of state highways in 1934. This segment was a proposed route in 1963, and was part of LRN 233, defined in 1953, but was renumbered as LRN 235 in 1957.
This routing is unconstructed from Route 580 to Route 24. The route is approximately 25th Avenue, Redwood Road, Pinehurst Road, and Canyon Road to Moraga; St. Mary's Road north to Lafayette. The official traversable local routing is Park Blvd, Sheperd Canyon Road, and Moraga Road. The portion from Route 580 to Route 93 was deleted from the Freeway and Expressway system in 1972, and the adopted freeway route was rescinded effective 7/18/1974. The adopted freeway routing from Route 93 to Route 24 was rescinded 7/17/1975. The town of Moraga has negotiated to lease a portion of the state right of way to construct a golf course. Construction of a conventional highway could be accomodated within the rescinded alignment. There are no plans to do so.
[SHC 253.4] From Route 93 westerly of Moraga to Route 24 near Lafayette. Part (1) is unconstructed from Route 185 to Route 580, and all of part (2) is unconstructed. Added to the Freeway and Expressway system in 1959. Note that the portion deleted in 1973 (Route 580 to Route 93) is explicitly not part of the freeway and expressway system.
Overall statistics for Route 77:
The route that would become LRN 77 was first defined in 1931 by Chapter 82. It was part of segment (l) (“Riverside to San Diego (Inland Route)”) and segment (m) (“Pomona to Temecula”).
Segment l (the Inland route from Riverside to San Diego) was an old established county routing that passed through many settlements and towns in plains and in narrow valleys lying in a semimountainous district between Riverside and San Diego. Riverside and San Diego counties had paved this route in the past, making a serviceable road for light traffic. The state still needed to improved the alignment, and the length of the ultimate State routing would be 20 miles shorter than the existing highway. It was added to the state highway system based on the volume of intercounty and intrastate traffic it carried, and by reason of relief it will afford to existing heavily traveled State roads and as an advantageous component of a comprehensive State system.
Segment m (the alternate route from Pomona to Temecula) was viewed as a valuable adjunct in state road systemization, providing a short cut to the Elsinore Lake district and to the Inland route from the territory between Corona and Pomona and the territory north and west of Pomona. The segment provided a convenient approach to the Inland route from Los Angeles and Pasadena vicinity. From extreme points in Los Angeles it offered an alternative passage to San Diego that, although longer than the coast route, avoided restriction to speed on the coast route that is caused by congestion and delays within more numerous cities (a rationale that was not only true in the early 1930s, but is true 80 years later). The proposed segment ran from the western terminus near Pomona to Santa Ana Canyoun near Prado (current Route 71 from Route 60 to Route 91), and through Temescal Canyon (present I-15 from Route 91 S to the I-215/I-15 jct) to Lake Elsinore and to Temecula on the inland route (recall that near Elsinore, US 395 did a job from the I-215 routing in Perris across to the I-15 routing). The plan was to use existing road facilities when possible. It was estimated that the route, by 1940, would carry 6450 vehicles on Sunday, and 3100 vehicles on weekdays (24 hr estimates).
In 1935, it was codified into the state highway code as:
“Pomona to San Diego via Temecula”
Note that at this time LRN 77 appears to have run into Vista, not Escondido, by some unknown routing. This is made clear by the definition of [LRN 196] as being "to [LRN 77] near Vista". LRN 197 started at "[LRN 77] near Escondido", so it appears that as of 1933, the route between Vista and Escondido appears to have been part of LRN 77.
That same year (1935), Chapter 626 added the following as Section 603 with no LRN:
“603. There is hereby added to the state highway system a new route or portion of route from the east city limits of Los Angeles on Valley Boulevard to [LRN 26] near El Monte via Valley Boulevard and Pomona Boulevard”
Note that the 1935 segment only runs as far E as the intersection of Valley and Garvey. It is discontiguous from the rest of LRN 77. .
In 1937, Chapter 841 repealed Section 603, and added the segment to [LRN 77] as segment (a) instead, numbering the 1935 segment as (b).
In 1951, Chapter 1562 extended LRN 196 to terminate at [LRN 77] near Escondido. This implied that by 1951, the portion from Vista to Escondido was no longer LRN 77, and LRN 77 had been rerouted (presumably to the US 395 routing). However, in 1947 Chapter 1233 changed LRN 196 to terminate at Vista, so the rerouting could have been as early as 1947.
In 1953, Chapter 237 changed the definition of (a) to drop the specific routings on Valley Boulevard and Pomona Boulevard.
This route was signed as follows:
This route began at the proposed LRN 167 (eventual I-710) intersection with Valley Blvd (the present I-710 terminus). It ran E along Valley Blvd (US 70 or US 99) to cosigned US 60/US 70/US 99 near El Monte. This was likely signed as a business routing once the Ramona Freeway was completed.
Between Pomona and Corona, this was and is signed as Route 71.
Acronyms and Explanations:
Route 76 Route 78
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