California State Route 20
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 211.882 mi (340.991 km) (plus about 15.5 mi (25 km) on US 101) |
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| History: | State highway in 1910–1919; numbered in 1934 | |||
| Restrictions: | No hazardous material along the northeast shore of Clear Lake between SR 29 and SR 53 | |||
| Major junctions | ||||
| West end: |
 SR 1 in Fort Bragg
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 US 101 in Willits I-5 in Williams SR 99 in Yuba City SR 49 in Nevada City
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| East end: |
 I-80 near Emigrant Gap
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| Highway system | ||||
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State Route 20 (SR 20) is a state highway in the northern central region of the U.S. state of California, running east–west across the state north of Sacramento. Its west end is at SR 1 in Fort Bragg, from where it heads east past Clear Lake, Colusa, Yuba City, Marysville, and Nevada City to I-80 near Emigrant Gap, where eastbound traffic can continue on other routes to Lake Tahoe or Nevada.
Portions of SR 20 are built near the routing of what was first a wagon road and later a turnpike in the late nineteenth century. This road was extended through the state highway system all the way to Ukiah in the early twentieth century, and the missing link near Clear Lake was completed in 1932 before the official designation of this highway as SR 20 in 1934. There have been subsequent improvements to the road, such as the conversion of the Grass Valley portion of the route to freeway standards.
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