Washington State Route 172

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State Route 172 marker

State Route 172
290x172px
SR 172 is highlighted in red.
Route information
Auxiliary route of SR 17
Defined by RCW 47.17.355
Maintained by WSDOT
Length: 35.01 mi[2] (56.34 km)
Existed: 1964[1] – present
Major junctions
West end: US 2 at Farmer
East end: SR 17 near Mansfield
Location
Counties: Douglas
Highway system
← x20px SR 171 SR 173 x20px →

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) at Farmer 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.

Route description

File:Mansfield-Washington-PB110038.JPG
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.[3] The highway travels north through farmland and serves Withrow before climbing Lone Butte and turning east into 14th Road NW.[2][4][5] SR 172 continues east into Mansfield,[6] where it becomes Main Street and turns southeast into Downtown at Mansfield High School.[7] The roadway turns northeast onto Railroad Avenue, serving the Mansfield Airport.[8] SR 172 leaves Mansfield and continues east as 14th Road NE until it ends at SR 17 at Sims Corner, north of Coulee City.[9][10][11]

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.[12]

History

A gravel county road extending from Lone Butte through Mansfield to Sims Corner first appeared in a 1933 Department of Highways map of Washington.[13] 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.[14][15] 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.[16][17] SSH 11B was split into SR 172 and SR 174 in the 1964 highway renumbering,[1][18][19] and no major revisions to the highway has occurred since.[20]

Major intersections

The entire highway is in Douglas County.

Location mi[2] km Destinations Notes
Farmer 0.00 0.00 US 2 – Coulee City, Waterville Western terminus
​ 35.01 56.34 SR 17 – Coulee City, Bridgeport, Grand Coulee Dam Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

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  2. ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
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  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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