A total of fifteen special routes of U.S. Route 101 exist.

Los Angeles alternate route

Present SR 1 in the Los Angeles area was U.S. Route 101 Alternate from the mid-1930s to 1964.

Los Angeles bypass route

The precursor to the Santa Ana Freeway between Los Angeles and

Anaheim Anaheim ( ) is a city in northern Orange County, California, part of the Los Angeles metropolitan area. As of the 2020 United States Census, the city had a population of 346,824, making it the most populous city in Orange County, the 10th-most p ...

was U.S. Route 101 Bypass from the early 1940s to the mid-1950s, when it became part of US 101. Old US 101 there is now partially SR 72.

Ventura business loop

US 101 Business in Ventura, California is a

business loop A business route (or business loop, business spur, or city route) in the United States is a short special route connected to a ''parent'' numbered highway at its beginning, then routed through the central business district of a nearby city or ...

that follows the former U.S. 101 alignment before the construction of the Ventura Freeway. The route runs along the entirety of Thompson Boulevard and portions of Main Street and Garden Street.

San Francisco bypass route

Until the 1964 renumbering, the present route of US 101 along the

Bayshore Freeway The Bayshore Freeway is a part of U.S. Route 101 (US 101) in the San Francisco Bay Area of the U.S. state of California. It runs along the west shore of the San Francisco Bay, connecting San Jose with San Francisco. Within the city of San Fran ...

was U.S. Route 101 Bypass, and US 101 used SR 82 ( El Camino Real) and I-280.

Rio Dell business loop

US 101 Business, called Wildwood Avenue, is a

of US 101 through

Rio Dell Rio Dell ( Spanish: ''Río Dell'', meaning "Dell River") is a city in Humboldt County, California, United States. It is located on the west bank of the Eel River north of Scotia at an elevation of 161 feet (49 m). The population was 3,363 a ...

. Its southernmost section between US 101 near Scotia to the north end of the Eel River Bridge is legally defined as an unsigned

California State Route 283 U.S. Route 101 Business is a business loop of U.S. Route 101 that runs along Wildwood Avenue in Rio Dell in Humboldt County, California. Its southernmost section between US 101 near Scotia to the north end of the Eel River Bridge is legally defin ...

Fortuna business loop

US 101 Business, called Main Street and Fortuna Blvd in its entirety, is a

of US 101 through Fortuna.

McKinleyville business loop

US 101 Business, called Central Ave its entirety, is a

of US 101 through

McKinleyville McKinleyville (formerly Minorsville) is a census-designated place (CDP) in Humboldt County, California McKinleyville is located north of Arcata, at an elevation of . The population was 15,177 at the 2010 census, up from 13,599 at the time of the ...

Astoria business loop

U.S. Route 101 Business is a business loop of US 101 that travels from Astoria to Warrenton. It is a former alignment of US 101, bypassed in 1964 when a new bridge opened across

Youngs Bay Youngs Bay, or Youngs River Bay, is located in the northwestern corner of the U.S. state of Oregon. The Youngs River meets the Columbia River at this point, which is situated between Astoria and Warrenton. The bay is named for the Youngs Rive ...

. It was originally designated U.S. Route 101 Alternate until about 1976. Major intersections

Ilwaco alternate route

U.S. Route 101 Alternate is an alternate route of U.S. Route 101 that bypasses the towns of Long Beach and Ilwaco in southwestern Washington.

References

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