Wyoming Highway 257

Wyoming Highway 257
Casper West Belt
WYO 257 highlighted in red
Route information
Maintained by WYDOT
Length	7.302 mi[1] (11.751 km)
Existed	2012–present
History	Completed in 2015
Major junctions
South end	WYO 220 near Red Butte
North end	US 20 / US 26 / US 20 Bus. / US 26 Bus. near Mills
Location
Country	United States
State	Wyoming
Counties	Natrona
Highway system
Wyoming State Highway System Interstate US State
← WYO 256 → WYO 258

Wyoming Highway 257 (WYO 257), also known as the Casper West Belt, is a state highway in Natrona County, Wyoming. The 7.3-mile (11.7 km) highway forms part of a bypass around Casper and Mills, connecting WYO 220 in the south to U.S. Route 20 (US 20) and US 26 in the north. The road itself continues east on an expressway carrying US 20 and US 26 to a junction with Interstate 25 (I-25).

The highway was proposed in the late 1990s to relieve truck congestion in Casper and Mills, particularly on WYO 220, and approved in 2002. The project used federal funding and began construction in 2013 after a series of eminent domain disputes delayed planning. WYO 257 opened to traffic on December 31, 2015.