List of highways numbered 166

The following highways are numbered 166:

Canada

Japan

Japan National Route 166

United States

U.S. Route 166

Alabama State Route 166

Arizona State Route 166 (former)

California State Route 166

Connecticut Route 166

Florida State Road 166

Georgia State Route 166

Illinois Route 166

Indiana State Road 166

Kentucky Route 166

Maine State Route 166

• Maine State Route 166A

Maine State Route 166A

Maryland Route 166

M-166 (Michigan highway)

Nevada State Route 166

New Jersey Route 166

New Mexico State Road 166

New York State Route 166

Ohio State Route 166

Oklahoma State Highway 166

Pennsylvania Route 166

Tennessee State Route 166

Texas State Highway 166

• Texas State Highway Loop 166

Texas State Highway Loop 166

Utah State Route 166 (former)

Virginia State Route 166

Washington State Route 166

Wisconsin Highway 166 (former)

California State Route 166

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 description

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.

Alabama State Route 166

State Route 166 is a short route in Coffee County in the southeastern part of the state. The western terminus of the route is at its junction with State Route 141 at Danleys Crossroads, an unincorporated community in the western part of the county. The eastern terminus of the route is at its junction with U.S. Highway 84 at Elba.

Route description

State Route 166 is a five-mile (8 km) long route. The route traverses along a two-lane road in western Coffee County, passing through no towns or unincorporated communities until it reaches Elba.

History

When State Route 166 was created in 1972, its western terminus was approximately two miles south of the current terminus. The original route began at an intersection approximately 10 miles (16 km) northwest of Opp. At this intersection, eastbound traffic on US-84 was routed onto northbound State Route 141, and through traffic on the roadway that had been carrying US-84 traffic continued on State Route 166 until it junctioned US-84 again west of Elba. In 1989, State Route 166 and US-84 exchanged routings between State Route 141 and Elba as part of improvements, including widening to four lanes, of US-84 across south Alabama.