Wyoming Highway 173

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Wyoming Highway 173

Buffalo Creek Road
WYO 173 highlighted in red
Route information
Maintained by WYDOT
Length1.61 mi[1] (2.59 km)
Major junctions
West end US 20 / WYO 789
East end CR 31
CountryUnited States
CountiesHot Springs
Highway system
  • Wyoming State Highway System
WYO 172 WYO 174

Wyoming Highway 173 (WYO 173) is a short 1.61-mile-long (2.59 km) Wyoming state road located in Hot Springs County south of Thermopolis.

Route description

Highway 173 crossing the Bighorn River on the CQA Four Mile Bridge

Wyoming Highway 173 begins its west end at US 20/WYO 789 just over a mile and a half south of Thermopolis. Named Buffalo Creek Road, Highway 173 travels southeasterly along the south bank of the Bighorn River. At 1.42 miles, WYO 173 crosses the river via the CQA Four Mile Bridge which is listed on the National Register of Historic Places.[2] Two-tenths of a mile later WYO 173 reaches its end at County Route 31 (South Yellowstone Road).[3] CR 31 continues another 1.6 miles south and returns to US 20/WYO 789.


The original Four Mile Bridge, which carried Highway 173 over the Big Horn River, was completed in 1928 and was added to the National Register of Historic Places as part of a fourty-bridge collection that illustrate steel truss construction.[2] It was offered for sale by the Wyoming Highway Department in 1987 ahead of a planned replacement.[4] The project to improve Highway 173 and replace the bridge was part of a 1984 agreement to eventually transfer control to Hot Springs County, but the county government declined to assume responsibility in 1993.[5]

Major intersections

The entire route is in Hot Springs County.

0.000.00 US 20 / WYO 789Western terminus of WYO 171
1.612.59 CR 31 (South Yellowstone Road)Eastern terminus of WYO 171
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Wyoming Department of Transportation Reference Marker Book (PDF) (Map). WYDOT. November 2004. Archived from the original (PDF) on July 17, 2011. Retrieved February 14, 2012.
  2. ^ a b Fraser, Clayton B. (May 4, 1982). "National Register of Historic Places Inventory - Nomination Form: CQA Four Mile Bridge". National Park Service. p. 12. Retrieved 2012-02-26.
  3. ^ Google (February 26, 2012). "Overview Map of Wyoming Highway 173" (Map). Google Maps. Google. Retrieved February 26, 2012.
  4. ^ Kirshner, Erich (August 17, 1987). "Psssst, buddy! Want a bridge?". Casper Star-Tribune. p. B1. Retrieved June 24, 2023 – via Newspapers.com.
  5. ^ "DOT wants rid of road; Hot Springs doesn't want it". Casper Star-Tribune. April 17, 1993. p. B1. Retrieved June 24, 2023 – via Newspapers.com.

External links