The Rocky Mountain capshell (Acroloxus coloradensis) is a species of freshwater snail in the family Acroloxidae, the river limpets.

It has been recorded in high-altitude ponds and lakes in Colorado, Montana, and Wyoming in the United States and British Columbia, Alberta, Ontario, and Quebec in Canada.

Below this altitude lake floor substrates are too fine, while above the abundance of calcium and other essential ions is too low.

[5] This is a relict species of isolated glacial mountain habitat, and its very small populations are scattered in widely separated locations.

Threats to the species include the loss and degradation of its alpine lake habitat from urbanization, particularly in parts of Colorado, pollution, drought, and recreation.