State Route 109 (SR 109) is a short, unsigned
state highway in the
U.S. state
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...
of
California
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
. It forms part of University Avenue in
San Mateo County
San Mateo County ( ), officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, and the third most populated city following Daly ...
between
U.S. Route 101 in
East Palo Alto
East Palo Alto (abbreviated E.P.A.) is a city in San Mateo County, California, United States. As of the 2020 census, the population of East Palo Alto was 30,034. It is situated on the San Francisco Peninsula, roughly halfway between the cities of ...
and
State Route 84 in
Menlo Park just west of the
Dumbarton Bridge. Although the route is unsigned, it may be noted on some online maps.
Route description
SR 109 begins at
U.S. Route 101 in
East Palo Alto
East Palo Alto (abbreviated E.P.A.) is a city in San Mateo County, California, United States. As of the 2020 census, the population of East Palo Alto was 30,034. It is situated on the San Francisco Peninsula, roughly halfway between the cities of ...
. It continues north, paralleling the city border with
Menlo Park before entering Menlo Park and crossing a railroad. SR 109 passes by
salt evaporators before terminating at
SR 84 just west of the
Dumbarton Bridge.
History
In April 1958, I-109 was proposed as a name for the route that is now
Interstate 280. This proposal was rejected by
AASHTO.
[
The California State Route 109 designation was first defined in 1963, running from Sunset Cliffs Boulevard to ]Interstate 5
Interstate 5 (I-5) is the main north–south Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels through the states of Californi ...
in San Diego
San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United State ...
. In 1972, that route was deleted and was renumbered as a western extension of Interstate 8. Later in 1984, SR 109 was defined as a route in Palo Alto.
The segment in East Palo Alto between US 101 and Notre Dame Avenue remains in local control. Under Cal S&HC § 409 (b), the state will not take control over this section until Caltrans and the city determine that it is in an "acceptable state of repair".
Major intersections
See also
*
References
External links
{{commonscat
California Highways: SR 109Caltrans: Route 109 highway conditions
109
State Route 109
Menlo Park, California