Devils Causeway, Mountain ridge in Flat Tops Wilderness Area, Colorado, United States

Devils Causeway is a narrow ridge in the Flat Tops Wilderness Area of Garfield County, Colorado, near the Garfield County line at about 40.03°N, 107.15°W. The landform sits in a hemiboreal climate where July averages 14 °C and January −15 °C, with roughly 527 mm of precipitation a year, most falling in September.

The name Devils Causeway appears on maps of the Flat Tops region in Garfield County, Colorado, where the ridge lies at roughly 40.03° N, 107.15° W, about 2,600 km west of Washington, D.C. The sources record no documented tribal route or dated event for the ridge; the surrounding climate is hemiboreal, with January averages near −15 °C and July near 14 °C.

The name Devils Causeway comes from the narrow rock bridge itself, which hikers cross on foot where the ridge pinches to a few feet. The crossing is the reason people seek out this section of the Flat Tops Wilderness trail, and accounts of it circulate among Colorado hikers as a test of nerve rather than a viewpoint.

The round trip hike from Stillwater Reservoir covers several miles and requires sturdy footwear and navigation tools for staying on route. Visitors should prepare for sudden weather shifts at high elevation and bring layers for changing conditions.

The causeway sits at roughly 12,300 feet in the Flat Tops Wilderness, and the crossing is short: a few steps over rock barely wider than a boot. Hikers often straddle or crawl it rather than walk upright, and wind at that elevation makes the exposure felt even on clear days.