Antelope Flat Reservoir is an impoundment located in the southern part of the Maury Mountains in Crook County, Oregon. It is formed by a 33-foot (10 m) high earth-fill dam built across Bear Creek for irrigation purposes. The western part of the lake is within the Ochoco National Forest. Though it covers 170 acres (69 ha) when full, and has a storage capacity of almost 2,000 acre-feet (87,120,000 cubic feet or 2,467,000 m3) with a maximum depth of 28 feet (8.5 m), the reservoir is often not filled to capacity, especially late in the irrigation season. A boat-launch ramp is located at the lake's western end, and a 25-unit campground lies just up the hill from there.
Fish in the reservoir include rainbow trout and catfish. A rotenone treatment was applied in 2009 in an effort to remove brown bullhead catfish