Wyoming Highway 77
| Old Shirley Basin Road | ||||
WYO 77 highlighted in red | ||||
| Route information | ||||
| Maintained by WYDOT | ||||
| Length | 22.18 mi (35.70 km) | |||
| Existed | Mid 1970s–present | |||
| Restrictions | Closed winters | |||
| Major junctions | ||||
| South end | WYO 487 north of Medicine Bow | |||
| North end | WYO 487 near Casper | |||
| Location | ||||
| Country | United States | |||
| State | Wyoming | |||
| Counties | Carbon | |||
| Highway system | ||||
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Wyoming Highway 77 (WYO 77) is a 22.18-mile (35.70 km) remote state highway in northeastern Carbon County, Wyoming, United States, that forms a western loop off of Wyoming Highway 487 (WYO 487), and connects with WYO 487 north of Medicine Bow and again south of Casper.