Special routes of U.S. Route 101

U.S. Route 101 Alternate
Location	Los Angeles, California
Existed	Mid-1930s–1964

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

U.S. Route 101 Bypass
Location	Los Angeles – Anaheim, California
Existed	Early-1940s–Mid-1950s

The precursor to the Santa Ana Freeway between Los Angeles and Anaheim 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.

U.S. Route 101 Business
Location	Ventura, California

US 101 Business in Ventura, California is a business loop 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.

U.S. Route 101 Bypass
Location	El Camino Real, California

Until the 1964 renumbering, the present route of US 101 along the Bayshore Freeway was U.S. Route 101 Bypass, and US 101 used SR 82 (El Camino Real) and I-280.

U.S. Route 101 Business
Location	Fortuna

US 101 Business, called Main Street and Fortuna Blvd in its entirety, is a business loop of US 101 through Fortuna.

U.S. Route 101 Business
Location	McKinleyville

US 101 Business, called Central Ave its entirety, is a business loop of US 101 through McKinleyville.

U.S. Highway 101 Business
Location	Astoria–Warrenton, Oregon
Length	7.40 mi[1][2] (11.91 km)

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

Major intersections
The entire route is in Clatsop County.

Location	mi[1][2]	km	Destinations	Notes
Warrenton	1.27	2.04	US 101 – Astoria, Seaside
Lewis and Clark River	4.67– 4.83	7.52– 7.77	Lewis and Clark River Bridge
Youngs Bay	6.75– 7.08	10.86– 11.39	Old Youngs Bay Bridge
Astoria	7.25 1.42	11.67 2.29	OR 202 east – Jewell, Vernonia	South end of OR 202 overlap
	0.18	0.29	US 101 to US 30 – Warrenton, Seaside, Astoria, Portland	North end of OR 202 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

U.S. Route 101 Alternate
Location	Long Beach, Washington
Existed	1931–present

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.