State Route 109 (SR 109) is a short, unsigned
state highway
A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either Route number, numbered or maintained by a sub-national state or province. A road numbered ...
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 so ...
of
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. It forms part of University Avenue in
San Mateo County
San Mateo County ( ), officially the County of San Mateo, is a county (United States), county located in the U.S. state of California. As of the 2020 United States census, the population was 764,442. Redwood City, California, Redwood City is th ...
between
U.S. Route 101
U.S. Route 101, or U.S. Highway 101 (US 101), is a major north–south highway that traverses the states of California, Oregon, and Washington on the West Coast of the United States. It is part of the United States Numbered Highway Syst ...
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 cit ...
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
U.S. Route 101, or U.S. Highway 101 (US 101), is a major north–south highway that traverses the states of California, Oregon, and Washington on the West Coast of the United States. It is part of the United States Numbered Highway Syst ...
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 cit ...
. It continues north, paralleling the city border with
Menlo Park before entering Menlo Park and crossing a railroad. SR 109 passes by
salt evaporators
In common usage, salt is a mineral composed primarily of sodium chloride (NaCl). When used in food, especially in granulated form, it is more formally called table salt. In the form of a natural crystalline mineral, salt is also known as ro ...
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 American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test quality control, protocols, and guidelines that are used in highway design and construction through ...
.
[
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 System, 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 thro ...
in San Diego
San Diego ( , ) is a city on the Pacific coast of Southern California, adjacent to the Mexico–United States border. With a population of over 1.4 million, it is the List of United States cities by population, eighth-most populous city in t ...
. In 1972, that route was deleted and was renumbered as a western extension of Interstate 8
Interstate 8 (I-8) is an Interstate Highway in the southwestern United States. It runs from the southern edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California, almost at the Pacific Ocean, to the junction with I-10, ...
. 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
{{CASR external links, SR, 109
California Highways: SR 109
109 109 may refer to:
* 109 (number), the integer following 108 and preceding 110
* AD 109, a year of the Julian calendar, in the second century AD
* 109 BC, a year of the pre-Julian Roman calendar
* 109 (department store), a department store in Shi ...
State Route 109
Menlo Park, California