Red Cliff is a statutory town in Eagle County, Colorado, United States. The population was 267 at the 2010 census. The town is a former mining camp situated in the canyon of the upper Eagle River just off U.S. Highway 24 north of Tennessee Pass. The town site is concealed below the highway and is accessible by a side road leading to Shrine Pass in the Sawatch Range. It was founded in 1879 during the Colorado Silver Boom by miners from Leadville who came over Tennessee Pass scouting for better prospects. The name derives from the red quartzite cliffs surrounding the town. As the first community in the Eagle Valley, it served temporarily as the first county seat of Eagle County until the relocation of the county seat to Eagle in 1921.The town consists of a cluster of older homes and converted trailers on the flanks of the canyon around the river, as well as a post office, a historic church and older wooden structures along the main street of the town.