Skip to main content

Paper Highways; Unbuilt California State Route 93

In this edition of Paper Highways we look at the history of the unbuilt California State Route 93 in the San Francisco Bay Area.



The History of California State Route 93

The history of CA 93 dates back to Legislative Routes (LRNs) that were added to the Freeway & Expressway System during 1959.  Specifically the LRNs that would make up the future planned route of CA 93 were as follows:

LRN 255 west from LRN 107 in Alamo to LRN 235 near Burton.
LRN 235 west from LRN 255 near Burton to LRN 254 near Moraga.  Note; LRN 235 was added to the State Highway System in 1953 as LRN 233 between CA 17/LRN 69 and US 50/LRN 50.  LRN 233 was reassigned as LRN 235 in 1957 and extended to Concord.
LRN 254 from LRN 235 northwest along the San Pablo Reservoir to I-80/US 40/LRN 7.
-  LRN 254 from I-80/US 40/LRN 7 west to CA 17/LRN 69.

The future planned route of CA 93 appears as LRN 255, LRN 245, and LRN 254 on the 1960 Division of Highways State  Map.


During the 1964 State Highway Renumbering LRN 255 and LRN 254 were assigned as CA 93.  CA 93's planned route would have included a multiplex of what was LRN 235 on what was renumbered to planned CA 77.   CA 93 was defined as; Route 680 near Alamo to Route 77 near Burton, Route 77 to Route 24 near Orinda, Route 24 near Orinda to Route 17 in Richmond via San Pablo.  Planned CA 93 was meant to be a freeway grade entirely contained within Contra Costa County and would have traversed a relatively sparsely populated part of the Diablo Range between Alamo westward to San Pablo.  The new planned route of CA 93 can be seen on the 1964 Division of Highways State Map.



According to CAhighways the definition of planned CA 93 was truncated to planned CA 77 near Burton during 1973.  The shortened planned route of CA 93 can be seen on the 1975 Caltrans State Map City Insert.


CA 93 has never had an officially adopted alignment but has a defined traversable route:

1.  From planned CA 77 Moraga Way west to CA 24.
2.  From CA 24 in Orinda; Camino Pablo and San Pablo Dam Road  west to I-80.
3.  From I-80 Richmond Parkway west to I-580.

Note; Richmond Parkway is an expressway grade built by the City of Richmond over the corridor of CA 93 between I-80 and I-580.  The City of Richmond apparently does want Richmond Parkway added to the State Highway System as CA 93 and has signed it with Contra Costa County Route 93 on 511 Signs.  According to CAhighways.org Richmond Parkway won't be accepted by the State until it is brought up to Caltrans Expressway standards.   The planned route of CA 93 can be seen on the 2005 Caltrans Map essentially unaltered from 1973 (note; the definition of CA 93 was clarified in 1988).


From I-80 westbound the route of Richmond Parkway is signed on guide signs as "To I-580."


I-80 westbound Exit 20 doesn't even contain a reference Richmond Parkway but is again signed as "To I-580."  If CA 93 were to be constructed to plan I-80 west Exit 20 would be the approximately junction of where it would cross I-80.




As noted above Contra Costa County Route 93 can be seen on the 511 signs of Richmond Parkway.  Oddly the 511 signs on Richmond Parkway state "Freeway Assist."  Richmond Parkway presently is 7 miles in length and was constructed during the 1990s.  Note; this image was snipped from Google Maps.


Comments

Popular posts from this blog

Former California State Route 1 over Old Pedro Mountain Road

California State Route 1 in western San Mateo County traverses the Montara Mountain spur of the Santa Cruz Mountains.  In modern times California State Route 1 passes through Montara Mountain via the Tom Lantos Tunnels and the highway is traditionally associated with Devils Slide.  Although Devils Slide carries an infamous legacy due it being prone landslides it pales in comparison to the alignment California State Route 1 carried prior to November 1937 over Old Pedro Mountain Road.   Old Pedro Mountain Road opened to traffic in 1915 and is considered one of the first major asphalted highways in California.  Old Pedro Mountain Road clambers over a grade from Montara towards Pacifica via the 922 foot high Saddle Pass.  Pictured above an overlook of Old Pedro Mountain Road facing southward towards Montara as it appears today.  Pictured below it the same view during June 1937 when it was part of the original alignment of California State Route 1.  Today Old Pedro Mountain sits abandoned a

Former US Route 101 and California State Route 1 in San Luis Obispo

Originally US Route 101 upon descending Cuesta Pass southbound entered the City of San Luis Obispo via Monterey Street.  From Monterey Street US Route 101 utilized Santa Rosa Street and Higuera Street southbound through downtown San Luis Obispo.  Upon departing downtown San Luis Obispo US Route 101 would have stayed on Higuera Street southward towards Pismo Beach and Arroyo Grande.  Notably; beginning in 1934 US Route 101 picked up California State Route 1 at the intersection of Monterey Street/Santa Rosa Street where the two would multiplex to Pismo Beach.  Pictured below is the 1 935 Division of Highways Map of San Luis Obispo County depicting the original alignments of US Route 101 and California State Route 1 in the City of San Luis Obispo.   Part 1; the history of US Route 1 and California State Route 1 in San Luis Obispo San Luis Obispo lies at the bottom of the Cuesta Pass (also known as the Cuesta Grade) which has made it favored corridor of travel for centuries.  Cuesta Pass

California State Route 232

This past month I drove the entirety of California State Route 232 in Ventura County. CA 232 is an approximately 4 miles State Highway aligned on Vineland Avenye which begins near Saticoy at CA 118 and traverses southwest to US Route 101 in Oxnard.  The alignment of CA 232 was first adopted into the State Highway System in 1933 as Legislative Route Number 154 according to CAhighways.org. CAhighways.org on LRN 154 As originally defined LRN 154 was aligned from LRN 9 (future CA 118) southwest to LRN 2/US 101 in El Rio.  This configuration of LRN 154 between CA 118/LRN 9 and US 101/LRN 2 can be seen on the 1935 California Division of Highways Map of Ventura County. 1935 Ventura County Highway Map According to CAhighways.org the route of LRN 154 was extended west from US 101/LRN 2 to US 101A/LRN 60 in 1951.  Unfortunately State Highway Maps do not show this extension due to it being extremely small. During the 1964 State Highway Renumbering LRN 154 was assigned CA 232.  Of n