SR 24 begins at the four-level stack interchange with Interstate 580 and Interstate 980 in Oakland; this interchange is located on top of Grove Shafter Park. SR 24 initially heads north before turning east near the Berkeley city limits. Route 24 rises from near sea level in downtown Oakland past its interchange with State Route 13, which is a freeway south of SR 24 (upgraded August 1999) and a surface street north of SR 24. After this, SR 24 crosses the Contra Costa County county line through the four-bore Caldecott Tunnel and offers some attractive views of the hilly terrain through which it passes. Some protection of the views comes from the highway's designation as a California Scenic Highway.[5]
On the other side of the tunnel, SR 24 travels through unincorporated Contra Costa County before entering Orinda. SR 24 crosses the Mokelumne Aqueduct soon after entering the city of Lafayette. SR 24 terminates at the intersection with Interstate 680 just inside the city limits of Walnut Creek.[6]
SR 24 is part of the California Freeway and Expressway System,[7] and is part of the National Highway System,[8] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[9] SR 24 is eligible to be included in the State Scenic Highway System;[10] however, Caltrans has only designated it as a scenic highway between the eastern end of the Caldecott Tunnel and I-680,[11] meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.[12] SR 24 is designated as both the Grove Shafter Freeway, after streets the route travels along (Grove Street was later renamed Martin Luther King Jr. Way), and the William Byron Rumford Freeway, honoring the first African American elected to a state public office in Northern California,[13] from the Caldecott Tunnel to the I-580 interchange segment of the MacArthur Maze, continuing henceforth as I-980 to the terminus with I-880.[14]
The Berkeley Hills as seen from CA 24 near Orinda.SR 24 near Lafayette, stradling BART tracks with Mt Diablo in the background.
History
Highway 24 was designated in 1932 in conjunction with the ongoing construction of the Broadway Low Level Tunnel (renamed the Caldecott Tunnel in 1960) which opened in 1937,[15] connecting with the new Eastshore Highway and the approaches to the new Bay Bridge by way of Tunnel Road and Ashby Avenue through Berkeley west of the Berkeley Hills, and routed along Mount Diablo Boulevard through Contra Costa County east of the hills. Before either the bridge or the tunnel were completed, Highway 24 was provisionally routed starting from downtown Oakland at the major intersection of San Pablo and Broadway, which was also the terminal point of US 40 and State Highway 17. From this point, Highway 24 proceeded northward along Broadway to College Avenue, then along College to Claremont Avenue, up Claremont to Tunnel Road, then up into the Berkeley Hills on Tunnel Road to the old Intercounty Tunnel (also called the Kennedy Tunnel), through the tunnel into Contra Costa County.[16]
Highway 24 remained along Ashby Avenue until completion of the Grove-Shafter Freeway in the late 1960s. This new freeway, which ran from the Caldecott Tunnel through downtown Oakland to the MacArthur and Nimitz Freeways, was designated Route 24 and Ashby was re-designated Route 13.
Route 24 used to extend much further east. The section of Interstate 680 between the current terminus of SR 24 and State Route 242 was dual-signed I-680 and SR 24 until c. 1987; State Route 242 which runs primarily in Concord was signed as Route 24 until the same time. Older maps show routes for 24 which continue along State Route 4 from the current intersection of 242 to the Antioch Bridge, continuing along the river road to Sacramento, currently State Route 160, then continuing north to Woodland, Marysville, Oroville, along the North Fork of the Feather River to a junction with State Route 89 (this segment is currently State Route 70), where it continued dual-numbered with 89 through Quincy. Highway 24 split from 89 near Graeagle, and continued east through Portola east until its terminus at U.S. Route 395.[17] Parts of the same route were also sometimes designated as State Route 84.
At least one published map from the 1960s incorrectly showed Route 24 extending eastward from Interstate 680 in Walnut Creek to Route 4 in Pittsburg that followed the Ygnacio Valley Road-Kirker Pass Road-Railroad Avenue corridor, presumably as a future extension that never materialized. A 1970 State Highway Map shows this corridor as a future Route 24 bypass.[1]
A 1956 version of Thomas Brothers maps shows Mt. Diablo Blvd. where present day Northgate Road is and labeled as Route 24, winding and climbing the mountain.
Exit list
Mileage is measured from SR 24's original western terminus, now part of Interstate 980.
Westbound exit and eastbound entrance; west end of SR 24; provides direct exit ramp onto Market Street / San Pablo Avenue (SR 123); I-580 east exit 19C, west exit 19D
2
Martin Luther King Jr Way, 51st Street
Eastbound exit and westbound entrance; Martin Luther King Jr Way was formerly Grove Street[19]
^California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original(XLS file) on June 30, 2015. Retrieved June 30, 2015.
^"Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
^Federal Highway Administration (March 25, 2015). National Highway System: San Francisco–Oakland, CA(PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 18, 2017.
^Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
^California Department of Transportation (2012). Scenic Highway Guidelines(PDF). Sacramento: California Department of Transportation. p. 5. Retrieved June 8, 2017.
SR 24 between the Caldecott Tunnel and Walnut Creek[4]
I-580 / I-980 in Oakland
SR 13 in Oakland
I-680 / Mount Diablo Boulevard in Walnut Creek
