State Trunk Highway 51 (often called Highway 51, STH-51 or WIS 51) was a number assigned to two different state highways in the U.S. state of Wisconsin:
- Highway 51 from 1917 to 1923, along the current route of U.S. Highway 63 from Turtle Lake to Spooner.
- Highway 51 from 1923 to 1936, currently routed as Highway 72 from Ellsworth to Downsville.
- For the highway in Wisconsin numbered 51 since 1926, see U.S. Highway 51.
.svg) State Trunk Highway 51 | ||||
|---|---|---|---|---|
| Route information | ||||
| Maintained by WisDOT | ||||
| Existed | 1918–1926 | |||
| Location | ||||
| Country | United States | |||
| State | Wisconsin | |||
| Highway system | ||||
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