State Route 110 (SR 110) is a 11.10-mile-long (17.86 km) state highway serving Olympic National Park and the Quileute Indian Reservation within Clallam County, located in the U.S. state of Washington. The highway travels west from U.S. Route 101 (US 101) in Forks as La Push Road along the Quileute and Sol Duc rivers to the boundary of Olympic National Park east of La Push. La Push Road was originally added to the state highway system in 1937 as Secondary State Highway 9B (SSH 9B), but was removed in 1955. SR 110 was later established on the route in 1991 after a previous highway with the same designation was removed. A spur route extending west to Mora was originally added with SSH 9B and re-added with SR 110 in 1991.
Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of annual average daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that between 1,300 and 2,300 vehicles per day used the highway, mostly at the US 101 intersection.[4]
SR 110 has a 2.67-mile-long (4.30 km) spur route serving Mora to the north of the Quileute River.[1] The highway, known as Mora Road,[1] begins at SR 110 west of Forks and travels west across the Sol Duc River into Olympic National Park and the Quileute Indian Reservation, crossing the Dickey River into Mora.[11] The gravel road was added to the state highway system as a spur of SSH 9B in 1937,[5] but the highways were removed in 1955.[6][7] After SR 110 was re-added to the state highway system in 1991, the spur route was put into state maintenance once again.[2]
^Staff (2011). "2011 Annual Traffic Report"(PDF). Washington State Department of Transportation. p. 138. Retrieved January 29, 2013.
^ abWashington State Legislature (March 18, 1937). "Chapter 207: Classification of Public Highways". Session Laws of the State of Washington (1937 ed.). Olympia, Washington: Washington State Legislature. p. 1006. Retrieved January 29, 2013.
^ abWashington State Legislature (1955). "Chapter 383". Session Laws of the State of Washington (1955 ed.). Olympia, Washington: Washington State Legislature.
^ abCopalis Beach, 1957 (Map). 1:250,000. United States Geological Survey. 1957. Retrieved January 29, 2013.