State Route 166 | ||||
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Route information | ||||
Maintained by Caltrans | ||||
Length | 95.886 mi [1] (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. | |||
Major junctions | ||||
West end | SR 1 in Guadalupe | |||
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East end | SR 99 at Mettler | |||
Location | ||||
Counties | Santa Barbara, San Luis Obispo, Kern | |||
Highway system | ||||
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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, running from State Route 1 in Guadalupe and through Santa Maria in Santa Barbara County to State Route 99 in Mettler in Kern County.
Route 166 starts off in Guadalupe in northwestern Santa Barbara County and heads east towards Santa Maria, the largest city on its eastern journey. 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.
After going through the towns of New Cuyama and Cuyama, the highway meets SR 33 north of Ventucopa. SR 33 and SR 166 merge until reaching Maricopa, where SR 166 heads due east for its last 20 miles (32 km), intersecting with I-5 about 9 miles (14 km) north of the Grapevine. SR 166 ends at SR 99 in Mettler, and it is the last exit for both I-5 and SR 99 southbound before they merge near Wheeler Ridge.
In Kern County, Highway 166 is known as the Maricopa Highway. West of Maricopa, where it skirts Santa Barbara and San Luis Obispo counties, it is called the Cuyama Highway. In the cities of Santa Maria and Guadalupe, it is known as Main Street.
SR 166 is part of the California Freeway and Expressway System, [2] but is not part of the National Highway System, [3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. [4] The route is eligible for the State Scenic Highway System, [5] but it is not officially designated as a scenic highway by the California Department of Transportation. [6] From US 101 to SR 33, SR 166 is known as the "CHP Officers Irvine and Stovall Memorial Highway". In February 1998, a large storm swelled the Cuyama River and caused it to wash out a section of the highway. Officers Britt Irvine and Rick Stovall were responding to an early morning call about a truck accident when their CHP cruiser drove off the washed out section. [7]
Before 1964, the portion of SR 166 merged with SR 33 was part of US 399.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, 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 an overlap due to a correction or change, and T indicates postmiles classified as temporary ( ). [1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
County | Location | Postmile [1] [8] [9] | Exit [10] | Destinations | Notes | |||
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Santa Barbara SB 0.00-90.99 [N 1] | Guadalupe | 0.00 | West Main Street | Continuation beyond SR 1 | ||||
0.00 | SR 1 | West end of SR 166 | ||||||
Santa Maria | 7.87 | SR 135 (Broadway, US 101 Bus.) | ||||||
8.93 88.60 [N 1] | US 101 south / Main Street | Interchange; west end of US 101 overlap | ||||||
8.93 88.60 [N 1] | West end of freeway on US 101 | |||||||
89.69 [N 1] | 172 | Donovan Road | ||||||
90.75 [N 1] | 173 | SR 135 south (Broadway, US 101 Bus. south) – Santa Maria | ||||||
San Luis Obispo SLO 0.00 [N 1] -22.89 | | 0.81 [N 1] 13.51 | East end of freeway on US 101 | |||||
| 0.81 [N 1] 13.51 | US 101 north / Cuyama Lane | Interchange; east end of US 101 overlap | |||||
Santa Barbara SB 22.89-R34.99 | No major junctions | |||||||
San Luis Obispo SLO R34.99-R51.09 | No major junctions | |||||||
Santa Barbara SB R51.09-R70.14 | No major junctions | |||||||
San Luis Obispo SLO R70.14-4.95 [N 2] | | 74.72 2.80 [N 2] | SR 33 south – Ojai, Ventura | West end of SR 33 overlap; former US 399 south | ||||
Kern KER 0.00 [N 2] -24.62 | Maricopa | R11.56 [N 2] 0.01 | SR 33 north (California Street) – Central District, Taft | East end of SR 33 overlap; former US 399 north | ||||
| 14.86 | Old River Road – Old River | ||||||
| 22.80 | I-5 | Interchange; I-5 exit 225 | |||||
Mettler | 24.62 | Mettler Frontage Road West – Mettler | ||||||
24.62 | SR 99 – Los Angeles, Bakersfield | Interchange; east end of SR 166; former US 99; SR 99 exit 3 | ||||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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State Route 1 (SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S. state of California. At a total of just over 656 miles (1,056 km), it is the longest state route in California, and the second-longest in the US after Montana Highway 200. SR 1 has several portions designated as either Pacific Coast Highway (PCH), Cabrillo Highway, Shoreline Highway, or Coast Highway. Its southern terminus is at Interstate 5 (I-5) near Dana Point in Orange County and its northern terminus is at U.S. Route 101 (US 101) near Leggett in Mendocino County. SR 1 also at times runs concurrently with US 101, most notably through a 54-mile (87 km) stretch in Ventura and Santa Barbara counties, and across the Golden Gate Bridge.
The Santa Ana Freeway is one of the principal freeways in Southern California, connecting Los Angeles and its southeastern suburbs including the freeway's namesake, the city of Santa Ana. The freeway begins at its junction with the San Diego Freeway, called the El Toro Y, in Irvine, signed as I-5. From there, it generally goes southeast to northwest to the East Los Angeles Interchange, where it takes the designation of U.S. Route 101 (US 101). It then proceeds 2.95 miles (4.75 km) northwest to the Four Level Interchange in downtown Los Angeles. Formerly, the entirety of the route was marked as US 101 until the 1964 highway renumbering, which truncated US 101 to the East Los Angeles Interchange and designated the rest of the freeway as I-5.
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State Route 152 is a state highway that runs from east to west near the middle of the U.S. state of California from State Route 1 in Watsonville to State Route 99 southeast of Merced. Its western portion provides access to and from Interstate 5 toward Southern California for motorists in or near Gilroy and San Jose.
State Route 46 is an east–west state highway in the U.S. state of California. It is a major crossing of the Coast Ranges and it is the southernmost crossing of the Diablo Range, connecting SR 1 on the Central Coast near Cambria and US 101 in Paso Robles with SR 99 at Famoso in the San Joaquin Valley.
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The State Scenic Highway System in the U.S. state of California is a list of highways, mainly state highways, that have been designated by the California Department of Transportation (Caltrans) as scenic highways. They are marked by the state flower, a California poppy, inside either a rectangle for state-maintained highways or a pentagon for county highways.
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State Route 12 is a state highway in the U.S. state of California that travels in an east–west direction from State Route 116 in Sebastopol in Sonoma County to State Route 49 just north of San Andreas in Calaveras County. The route connects the Sonoma and Napa valleys with the Sacramento–San Joaquin River Delta and the Sierra Foothills. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa, to its partial interchange with Farmers Lane.
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