California State Route 166
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| Maricopa Highway | ||||
Map of western California with SR 166 highlighted in red
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| Maintained by Caltrans | ||||
| Length: | 95.886 mi (154.314 km) SR 166 is broken into pieces, and the length does not reflect the US 101 and SR 33 overlaps that would be required to make the route continuous. |
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| West end: |
 SR 1 in Guadalupe
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| East end: |
 SR 99 at Mettler
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State Route 166 (SR 166) is a state highway in the U.S. state of California. It connects the Central Coast to the southern San Joaquin Valley.
This route is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System.
Route 166 starts off in Guadalupe in northwestern Santa Barbara County and heads East towards the largest city on its Eastern journey: Santa Maria. It then joins with U.S. Route 101 for the last few miles in Santa Barbara County before crossing the Santa Maria River and splitting off in San Luis Obispo County. For the next 75 miles (121 km), SR 166 crosses the Santa Barbara/San Luis Obispo county line a total of five times. This stretch follows the Cuyama River through a canyon separating the Sierra Madre Mountains from mountains in San Luis Obispo County, and then opens out into the Cuyama Valley, passing cattle ranches, going through the Russell Ranch Oil Field, and passing Aliso Canyon Road, the turnoff to the South Cuyama Oil Field. On the north during this stretch is the mile-high Caliente Range, which contains Caliente Mountain, the highest peak in San Luis Obispo County.
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