Tarryall Reservoir lies in Park County, Colorado, U.S. east of Fairplay.

The 70-foot (21-meter) high dam stores 1,580 acre-feet (1,950,000 cubic meters) of water.

Colorado Parks and Wildlife owns the dam, and its NID ID# is CO00342.

Located 16.5 miles (26.6 kilometers) southeast of the hamlet of Jefferson, Colorado on Park County Road 77, the wildlife area offers coldwater lake and stream fishing, waterfowl and big game hunting, and wildlife viewing and camping.

[1][4] The reservoir was originally planned to function as a fish hatchery, but this effort ended, and now it offers outdoor recreation.