Route information | ||||
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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 | ||||
Country | United States | |||
State | California | |||
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 to 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 (Guadalupe Street) | 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; US 101 north exit 171 | ||||||
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 | |||||
US 101 north / Cuyama Lane | Interchange; east end of US 101 overlap; US 101 south exit 175 | |||||||
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) to I-5 north – Central District, Taft | East end of SR 33 overlap; former US 399 north | ||||
| 14.86 | Old River Road – Old River | ||||||
| 22.80 | I-5 (West Side Freeway) | 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 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.
State Route 58 is a major east-west state highway in the U.S. state of California that runs across the Coast Ranges, the southern San Joaquin Valley, the Tehachapi Mountains, which border the southern Sierra Nevada, and the Mojave Desert. It runs between U.S. Route 101 near Santa Margarita and Interstate 15 in Barstow. It has junctions with Interstate 5 near Buttonwillow, State Route 99 in Bakersfield, State Route 202 in Tehachapi, State Route 14 near Mojave, and U.S. Route 395 at Kramer Junction. SR 58 also provides access to Edwards Air Force Base. At various points it is known as the Calf Canyon Highway, Carrisa Highway, Bakersfield-McKittrick Highway, Rosa Parks Highway, Westside Parkway, Barstow-Bakersfield Highway, Bakersfield Tehachapi Highway, Kern County Korean War Veterans Memorial Highway, and Mojave-Barstow Highway.
State Route 92 is a state highway in the U.S. state of California, serving as a major east-west corridor in the San Francisco Bay Area. From its west end at State Route 1 in Half Moon Bay near the coast, it heads east across the San Francisco Peninsula and the San Mateo–Hayward Bridge to downtown Hayward in the East Bay at its junction with State Route 238 and State Route 185. It has interchanges with three freeways: Interstate 280, U.S. Route 101 in or near San Mateo, and Interstate 880 in Hayward. It also connects indirectly to Interstates 238 and 580 by way of Hayward's Foothill Boulevard, which carries Route 238 and flows directly into Route 92.
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.
State Route 2 (SR 2) is a state highway in the U.S. state of California. It connects the Los Angeles Basin with the San Gabriel Mountains and the Victor Valley in the Mojave Desert. The highway's southwestern end is at the intersection of Centinela Avenue at the Santa Monica-Los Angeles border and its northeastern end is at SR 138 east of Wrightwood. The SR 2 is divided into four segments, and it briefly runs concurrently with U.S. Route 101 (US 101) and Interstate 210 (I-210). The southwestern section of SR 2 runs along a segment of the east–west Santa Monica Boulevard, an old routing of US 66, to US 101 in East Hollywood; the second section runs along segments of both the north–south Alvarado Street and Glendale Boulevard in Echo Park; the third section to I-210 in Glendale is known as the north–south Glendale Freeway; and the northeastern portion from I-210 in La Cañada Flintridge to SR 138 is designated as the Angeles Crest Highway.
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.
State Route 35, generally known as Skyline Boulevard for most of its length, is a mostly two-lane state highway in the U.S. state of California. It runs along the ridge of the Santa Cruz Mountains from the high point of State Route 17 near Lexington Reservoir in Santa Clara County to State Route 1 just south of Daly City in San Mateo County, where it crosses SR 1 and loops around Lake Merced to become Sloat Boulevard in San Francisco. SR 35 then continues along Sloat Boulevard until it reaches its terminus when it meets SR 1 again at 19th Avenue.
State Route 154 is a state highway in the U.S. state of California that runs from Los Olivos to Santa Barbara, crossing the San Marcos Pass in the Santa Ynez Mountains. Before U.S. Route 101 was built through the Gaviota Pass, SR 154 was the main throughway to Santa Barbara and the tri city area including use as a stagecoach route in early years. After being replaced by US 101 as the primary route between the Santa Ynez Valley and Santa Barbara, SR 154 now serves as a scenic bypass.
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.
State Route 41 is a state highway in the U.S. State of California, connecting the Central Coast with the San Joaquin Valley and the Sierra Nevada. Its southern terminus is at the Cabrillo Highway in Morro Bay, and its northern terminus is at SR 140 in Yosemite National Park. It has been constructed as an expressway from near SR 198 in Lemoore north to the south part of Fresno, where the Yosemite Freeway begins, passing along the east side of downtown and extending north into Madera County.
State Route 33 is a north–south state highway in the U.S. state of California. It runs north from U.S. Route 101 in Ventura through the Transverse Ranges and the western side of the San Joaquin Valley to Interstate 5 at a point east of Tracy. SR 33 replaced part of U.S. Route 399 in 1964 during the "great renumbering" of routes. In the unincorporated sections of Kern County it is known as the West Side Highway. In addition, the California Legislature designated the entire Kern County portion as the Petroleum Highway in 2004. The southernmost portion in Ventura is a freeway known as the Ojai Freeway, while it is known as the Maricopa Highway from Ojai to Maricopa.
State Route 150 is a state highway in the U.S. state of California. It runs from U.S. Route 101 near the Ventura/Santa Barbara County line to State Route 126 in Santa Paula, providing a connection to Lake Casitas and Ojai. It is a two-lane road. There were some one-lane bridges near the western end of the route, but these were rebuilt as two-lane bridges after flooding in 2005.
State Route 27, commonly known by its street name Topanga Canyon Boulevard, is a state highway in the U.S. state of California that runs from the Pacific Coast Highway at Topanga State Beach near Pacific Palisades, through the Topanga Canyon in Topanga, and continuing through Woodland Hills, Canoga Park, West Hills, and Chatsworth to the Ronald Reagan Freeway.
State Route 156 is a west to east state highway in the U.S. state of California, running from State Route 1 in Castroville to State Route 152 near Hollister. It serves as part of the primary route from the Monterey Peninsula to either the San Francisco Bay Area or the California Central Valley.
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