Washington State Route 172

State Route 172 (SR 172) is a 35.01-mile (56.34 km) long state highway serving rural Douglas County in the U.S. state of Washington. The highway travels north from U.S. Route 2 (US 2) near Waterville through Withrow and east through Mansfield before ending at SR 17 at Sims Corner. The highway follows the route of a county road built in the 1930s and signed as Secondary State Highway 10B (SSH 10B) in 1955. SSH 10B became SR 172 during the 1964 highway renumbering and served a daily average of less than 700 vehicles in 2011.

State Route 172 marker

State Route 172

SR 172 is highlighted in red.
Route information
Auxiliary route of SR 17
Maintained by WSDOT
Length35.01 mi[1] (56.34 km)
Existed1964[2]–present
Major junctions
West end US 2 near Waterville
East end SR 17 near Leahy
Location
CountryUnited States
StateWashington
CountiesDouglas
Highway system
← SR 171→ SR 173

Route description
SR 172 passing through Mansfield as Main Street

SR 172 begins as Road C NW at an intersection with US 2 at the unincorporated community of Farmer, between Waterville and Coulee City. The highway travels north through farmland and serves Withrow before climbing Lone Butte and turning east into 14th Road NW.[1] SR 172 continues east into Mansfield, where it becomes Main Street and turns southeast into Downtown at Mansfield High School. The roadway turns northeast onto Railroad Avenue, serving the Mansfield Airport. SR 172 leaves Mansfield and continues east as 14th Road NE until it ends at SR 17 at Sims Corner, between Coulee City and Leahy.[3][4]

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 average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that between 200 and 690 vehicles per day used the highway, mostly in Mansfield.[5]

History
SR 172 westbound at SR 17

A gravel county road extending from Lone Butte through Mansfield to Sims Corner first appeared in a 1933 Department of Highways map of Washington.[6] The road was paved and used temporarily by Primary State Highway 10 (PSH 10) until a Bridgeport–Leahy road was built to the northeast in the 1950s.[7][8] A paved road from Mansfield to Withrow and Farmer was built by 1950 and was signed as an extension of Secondary State Highway 10B (SSH 10B) in 1955.[9][10] SSH 11B was split into SR 172 and SR 174 in the 1964 highway renumbering.[2][11][12]

Major intersections

The entire highway is in Douglas County.

Locationmi[1]kmDestinationsNotes
​0.000.00 US 2 – Coulee City, WatervilleWestern terminus
​35.0156.34 SR 17 – Coulee City, Bridgeport, Grand Coulee DamEastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Strategic Planning Division (March 5, 2012). State Highway Log Planning Report 2011, SR 2 to SR 971 (PDF) (Report). Washington State Department of Transportation. pp. 1164–1167. Retrieved January 15, 2013.
  2. "47.17.355: State route No. 172". Revised Code of Washington. Washington State Legislature. 1970. Retrieved January 15, 2013.
  3. Google (January 15, 2013). "State Route 172" (Map). Google Maps. Google. Retrieved January 15, 2013.
  4. Douglas County 2010 Road Atlas (PDF) (Map) (2010 ed.). 1:16,000. East Wenatchee, Washington: Douglas County Transportation & Land Services. April 2010. pp. 111, 119. Retrieved January 15, 2013.
  5. Staff (2011). "2011 Annual Traffic Report" (PDF). Washington State Department of Transportation. p. 152. Retrieved January 15, 2013.
  6. Highway Map of the State of Washington (DJVU) (Map). Department of Highways. April 1, 1933. Retrieved January 15, 2013.
  7. Highways of the State of Washington (DJVU) (Map). Department of Highways. 1939. Retrieved January 15, 2013.
  8. "Chamber Session Broad in Scope". Spokane Daily Chronicle. Spokane, Washington. April 2, 1949. Retrieved January 15, 2013.
  9. Washington State Legislature (1955). Session Laws of the State of Washington. Session Laws of the State of Washington (1955 ed.). Olympia, Washington: Washington State Legislature.
  10. Ritzville, 1953 (JPG) (Map). 1:250,000. United States Geological Survey. 1953. Retrieved January 15, 2013.
  11. Prahl, C. G. (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission, Department of Highways. Retrieved January 15, 2013.
  12. Ritzville, 1965 (JPG) (Map). 1:250,000. United States Geological Survey. 1965. Retrieved January 14, 2013.
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