Skip to main content

California State Route 109

On the south side of San Francisco Bay between US Route 101 and California State Route 84 there are to unsigned short surface routes; CA 109 and CA 114.  Both CA 109 and CA 114 are located with the boundaries of Menlo Park and East Palo Alto, this entry is about the former route CA 109.


CA 109 is a 2 mile state highway running on University Avenue between US 101 in East Palo Alto to CA 84 in Menlo Park.  Northbound traffic departing US 101 from exit 403 must join Donohoe Street and take a brief western jog to reach CA 109 on University Avenue.



CA 109 north travels through East Palo Alto and enters Menlo Park at Notre Dame Avenue.  Notre Dame Avenue north to CA 84 was the first segment of CA 109 that was adopted by Caltrans.  Traffic is slow with speed limits as low as 25 MPH in East Palo Alto.






CA 109 on University Avenue crosses a set of rails before terminating at CA 84.




The north terminus of CA 109 is within view of modern Dumbarton Bridge crossing San Francisco Bay.  The Dumbarton Bridge is a Twin Concrete Girder design which is 1.63 miles in length.  The modern Dumbarton Bridge was opened to traffic in 1984 and was a replacement for the 1927 span which was the first highway crossing of San Francisco Bay.


According to CAhighways the current routing of CA 109 was created in 1984 from CA 84 south on University Avenue to Notre Dame Avenue.  In 1988 legislation was passed which allowed CA 109 to be extended south on University Avenue to US 101 but maintenance wasn't picked up apparently until 1997.

CAhighways on CA 109

The first CA 109 was along Sunset Cliffs Boulevard in San Diego.  The first CA 109 first appears on the State Highway Map in 1964 and was apparently created out of legislation in 1963 according to CAhighways.org.  The original CA 109 was deleted in 1972 and became an extension of I-8. 

1964 State Highway Map 

Interestingly the second CA 109 appears on the 1986 State Highway Map City Insert as CA 209 running south from CA 84 to Notre Dame Avenue.

1986 State Highway Map City Insert

On the 1988 State Highway Map City Insert CA 109 is shown correctly, I'm not sure if the 1986 map was an error.

1988 State Highway Map City Insert

CA 109 appears as a complete route between CA 84 and US 101 on the 1990 State Highway Map City Insert.

1990 State Highway City Insert

Comments

Popular posts from this blog

Yes, the color of your nearby fire hydrant matters...

...and here's why. You will find White, Red, Yellow and Violet colored fire hydrants pretty much everywhere.  But there's a reason for this - and it's because of the National Fire Protection Association (NFPA).  This association has issued guidelines for color coding standards for fire hydrants.  These color codes from the body of the hydrant, top of the hydrant, and in some municipalities the outlet caps are designed to allow fire fighters to know what type of system, water flow rate (Gallons Per Minute or GPM), and level of water pressure.  This guideline is known as NFPA 291 and is intended to be used universally throughout the United States. The NFPA guidelines are specific to the body and the top cap of the hydrant.  If a hydrant is WHITE or YELLOW - it means that it is connected to a public/municipal water system.  If a hydrant is RED - the hydrant is connected to a private system, typically a well.  These are most common in rural or unincorporated areas

Phase 1 of the California State Route 132 West Expressway (in the making since 1947)

On September 15, 2022, the Phase 1 of the California State Route 132 West Expressway opened in the city of Modesto from California State Route 99 west to North Dakota Avenue.  Phase 1 of the California State Route 132 West Expressway was built upon a corridor which was tentatively to designated to become the branching point for Interstate 5W in the 1947 concept of the Interstate Highway System.  The present California State Route 132 West Expressway corridor was adopted by the California Highway Commission on June 20, 1956.  Despite almost being rescinded during the 1970s the concept of the California State Route 132 West Expressway corridor lingered on for over half a century and became likely the oldest undeveloped right-of-way owned by California Transportation Commission.  Pictured above is the planned California State Route 132 freeway west of US Route 99 in Modesto as featured in the May/June 1962 California Highways & Public Works.   The history of the California State Route

Aptos Creek Road to the Loma Prieta ghost town site

Aptos Creek Road is a roadway in Santa Cruz County, California which connects the community of Aptos north to The Forest of Nisene Marks State Parks.  Aptos Creek Road north of Aptos is largely unpaved and is where the town site of Loma Prieta can be located.  Loma Prieta was a sawmill community which operated from 1883-1923 and reached a peak population of approximately three hundred.  Loma Prieta included a railroad which is now occupied by Aptos Creek Road along with a spur to Bridge Creek which now the Loma Prieta Grade Trail.  The site of the Loma Prieta Mill and company town burned in 1942.   Part 1; the history of Aptos Creek Road and the Loma Prieta town site Modern Aptos traces its origin to Mexican Rancho Aptos.  Rancho Aptos was granted by the Mexican Government in 1833 Rafael Castro.  Rancho Aptos took its name from Aptos Creek which coursed through from the Santa Cruz Mountains to Monterey Bay.  Castro initially used Rancho Aptos to raise cattle for their hides.  Following