Crystal Reservoir, Lake on the Gunnison River in Colorado, United States

Crystal Reservoir is a 340-acre artificial lake on the Gunnison River in the upper Black Canyon, formed behind Crystal Dam, a 323-ft concrete double-arch structure. It lies at 2,180 m in Montrose County within Curecanti National Recreation Area, about 6 miles west of Morrow Point Dam. It is the smallest and least developed of the park's three Aspinall Unit reservoirs.

Crystal Reservoir is the last of the three impoundments of the Wayne N. Aspinall Unit of the Colorado River Storage Project. Construction of Crystal Dam, a 323-ft concrete double-arch structure, began in 1973, five years after Morrow Point Dam and seven after Blue Mesa Dam; the reservoir was created in 1976. It lies about 6 miles west of Morrow Point Dam, the final impoundment before the Gunnison enters the Black Canyon.

Crystal Reservoir lies at the far western end of Curecanti National Recreation Area, the last impoundment before the Gunnison enters the Black Canyon. Recreation is limited to hand-carried craft, camping and hiking: a single boat-in campsite sits about 4 miles west of Mesa Creek at the mouth of Crystal Creek, and the Mesa Creek Trail crosses the water on a footbridge.

Access to Crystal Reservoir is via a one-mile road north of U.S. 50 at Cimarron to the Mesa Creek Trailhead, or from Colorado Highway 92 at the Crystal Creek Trailhead, 24 miles west of Blue Mesa Dam. Only hand-carried craft are allowed; a boat-in campsite sits about 4 miles west at the mouth of Crystal Creek. Mesa Creek is day-use only, with developed campsites nearby at Cimarron.

The reservoir is the most isolated of the three water bodies in the Curecanti area, offering a quieter alternative to busier locations. Water levels fluctuate significantly due to releases from the nearby Morrow Point Dam, creating changing shorelines and landscape views throughout the year.