California State Route 109
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| University Avenue | ||||
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| Maintained by Caltrans | ||||
| Length: | 1.870 mi (3.009 km) | |||
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| South end: |
 US 101 in East Palo Alto
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| North end: |
 SR 84 in Menlo Park
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State Route 109 (SR 109) is a short, unsigned state highway in the U.S. state of California. It is the portion of University Avenue that runs between U.S. Route 101 and State Route 84 in East Palo Alto and Menlo Park. The route is unsigned; however, it is noted on some online maps.
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.
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 in San Diego. In 1972, that route was deleted and was redefined in 1984 as a route in Palo Alto.
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