California State Route 109

For the earlier highway signed as Route 109, see California State Route 109 (1964-1972).

State Route 109
University Avenue
SR 109 highlighted in red
Route information
Maintained by Caltrans
Length	1.870 mi (3.009 km)
Major junctions
South end	US 101 in East Palo Alto
North end	SR 84 in Menlo Park
Location
Country	United States
State	California
Counties	San Mateo
Highway system
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← SR 108 → I-110

State Route 109 (SR 109) is a short, unsigned state highway in the U.S. state of California. It forms part of University Avenue in San Mateo County between U.S. Route 101 in East Palo Alto 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. 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.^[1]

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.^[2] The California State Route 109 designation was first defined in 1963, running from Sunset Cliffs Boulevard to Interstate 5 in San Diego. 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

Except where prefixed with a letter, postmiles were measured on the road as it was when the route was established, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).^[2] Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in San Mateo County.

Location	Postmile [2][3][4]	Destinations	Notes
East Palo Alto	​	University Avenue	Continuation beyond US 101
	​	US 101 (Bayshore Freeway) – San Francisco, San Jose	Interchange; south end of SR 109; US 101 exit 403
East Palo Alto–Menlo Park line	1.10	Notre Dame Avenue	South end of state maintenance
Menlo Park	1.87	SR 84 (Bayfront Expressway) – Menlo Park, Dumbarton Bridge, Fremont	North end of SR 109
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

• California Roads portal

References

1. Bay Area Metro Street Atlas (Map). Thomas Brothers. 2008.
2. California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on September 5, 2015. Retrieved June 30, 2015.
3. California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
4. California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006

External links

Template:Attached KML/California State Route 109

KML is from Wikidata

• Caltrans: State Route 109 highway conditions
• Caltrans Traffic Conditions Map
• California Highway Patrol Traffic Incidents
• California Highways: SR 109
• California @ AARoads.com - State Route 109