Oregon Trail Ruts State Historic Site is a preserved site of wagon ruts of the Oregon Trail on the North Platte River, about 0.5 miles south of Guernsey, Wyoming.

Here, wagon wheels, draft animals, and people wore down the trail into a sandstone ridge about two to six feet, during its heavy usage from 1841–1869.

The half-mile stretch is "unsurpassed" and is the best-preserved set of Oregon Trail ruts anywhere along its former length.

[1][2] The trail was first recorded in 1812, when Robert Stuart and six others came through there heading east from Fort Astoria, Oregon.

[2] The trail ruts are 0.5 miles (0.80 km) long and are worn 2 to 6 feet (0.61 to 1.83 m) into a sandstone ridge.