Skip to main content

California State Route 242

After driving the Warren Freeway on California State Route 13 east via CA 24 and Interstate 680 to drive California State Route 242.


CA 242 is a 3 mile freeway in Contra Costa County which runs northward from I-680 in Pleasant Hill to CA 4 in Concord .  CA 242 is a former segment of what was once a much larger CA 24 which was routed through the area on Legislative Route Number 75 in 1935 when it was extended to Berkeley from Sacramento.

The route of CA 24 from originally used the following alignment prior to the present CA 242 freeway being completed:

-  CA 24 was multiplexed with CA 21 north from Walnut Creek to Pleasant Hill.  CA 24/CA 21 entered Pleasant Hill on Contra Consta Boulevard where CA 24 split on Monument Road towards Concord.
-  CA 24 entered Concord on Monument Road which becomes Galindo Street entering downtown.
-  CA 24 exited downtown via Willow Pass Road which continued to CA 4.

The original alignment of CA 24 on the current CA 242 corridor can be seen on the 1938 State Highway Map.

1938 State Highway Map

By 1946 a new proposed alignment of CA 24 bypassing downtown Concord along what essentially is the modern CA 242 corridor is shown on the State Highway Map.

1946 State Highway Map

CA 24 was realigned by 1948 on a partially constructed Concord Bypass.  CA 24 was routed out of downtown Concord via Concord Avenue to the new limited access grade which is now the northern extent of CA 242.

1948 State Highway Map

In 1959 a new proposed cut-off route for CA 24 which would take a wide bypass of Concord to Antioch was assigned as LRN 256 according to CAhighways.org.

CAhighways.org on LRN 256

LRN 256 can be seen on the 1960 State Highway Map.

1960 State Highway Map

During the 1964 State Highway renumbering the planned path of LRN 256 was assigned to LRN 24.  CA 24 from Pleasant Hill to Concord stayed signed as CA 24 but was assigned LRN 242.

1963 State Highway Map

1964 State Highway Map

By 1965 the Concord bypass was completed and what is essentially modern CA 242 took form.

1965 State Highway Map

Interestingly CA 24 signage on the Concord bypass isn't changed on State Highway maps until 1988.  CA 24 appears to have been cut back to Walnut Creek at I-680 by 1988. 

1986 State Highway Map 

1988 State Highway Map

According to CAhighways.org the entire route of CA 242 appears to have been fully converted to freeway standards by 1992.  The planned route of CA 24 via what was LRN 256 appears to have never been officially cancelled.

CAhighways.org on CA 24

My approach to CA 242 was via CA 24 east and I-680 north.  The photo below is the eastern terminus of CA 24 at I-680 in Walnut Creek.  As described above it was wasn't until the late 1980s when the I-680/CA 24 multiplex was elminated.


I-680 north meets CA 242 at Exit 50 at a split junction.  I-680 essentially follows the former path of CA 21 whereas CA 242 obviously is the former path of CA 24.




As CA 242 north begins it almost immediately enters Concord.


CA 242 north has exits for; Clayton Road, Concord Avenue, Grant Street and Olivera Road before the terminus at CA 4.  The north terminus of CA 242 includes ramps to both CA 4 west and CA east.








Comments

Popular posts from this blog

California State Route 190; a Trans-Sierra Highway that could have been

This past week I decided to take a small scale road trip on California State Route 190 from CA 99 east to the unbuilt section over the Sierra Nevada Range.  While I was in for what turned out to be a fun drive following the course of the Tule River watershed what I found researching the back story of CA 190 was one of the most complex and unusual stories of any California State Highway.  Given that I had a ton of older photos of the eastern segment of CA 190 in the Mojave Desert of Inyo County I thought it was time to put something together for the entire route. The simplified story of CA 190 is that it is a 231 mile state highway that has a 43 mile unbuilt gap in the Sierra Nevada Range.  CA 190 is an east/west State Highway running from CA 99 in Tulare County at Tipton east to CA 127 located in Death Valley Junction near the Nevada State Line in rural Inyo County.  The routing CA 190 was adopted into the State Highway system as Legislative Route 127 which was adopted in 1933 acc

Old US Route 40 on Donner Pass Road

While completing California State Route 89 between Lassen Volcanic National Park and US Route I took a detour in Truckee up the infamous Donner Pass Road. Generally I don't dispense with the history of a roadway before the route photos but the history of Donner Pass is steeped within California lore and western migration.  The first recorded Wagon Crossing of Donner Pass was back in 1844.  The infamous Donner Party saga occurred in the winter of 1846-47 in which only 48 of the 87 party members survived.  Although the Donner Party incident is largely attributed to poor planning and ill conceived Hastings Cutoff it largely led to the infamous reputation of Donner Pass. The first true road over the Sierra Nevada Range via the Donner Pass was known as the Dutch Flat & Donner Lake Road.  The Dutch Flat & Donner Lake Wagon Road was completed by 1864 to assist with construction of the Central Pacific build the First Trans-Continental Railroad over Donner Pass.  The websit

California State Route 159 (former California State Route 11 and US Route 66)

California State Route 159 was a post 1964-Renumbering State Route which was designated over former segments of California State Route 11 and US Route 66.  As originally defined California State Route 159 began at Interstate 5/US Route 99 at the Golden State Freeway in Los Angeles.  California State Route 159 followed Figueroa Street, Colorado Boulevard and Linda Vista Avenue to the planned Foothill Freeway.  California State Route 159 was truncated during 1965 to existing solely on Linda Vista Avenue where it remained until being relinquished during 1989.  California State Route 159 was formally deleted from the State Highway System during 1992.   The history of California State Route 159 Prior to 1933 the Division of Highways was not actively involved in maintaining urban highways outside of occasional cooperative projects.  The responsibility for signage of US Routes in cities was thusly given to the Automobile Club of Southern California in the Southern California region.  This bei