Antero is Denver Water’s first collection reservoir on the South Platte River. Geologists believe Antero Reservoir occupies the site of a former lake-bed. While Green Lake lies submerged within the reservoir, an extinct volcano, Buffalo Peaks, looms above.

Take Highway 285 to Fairplay. About a mile south of Fairplay veer southeast on Highway 9 toward Hartsel. After about 15 miles, a stop sign marks the intersection with Highway 24. Turn right (west). The entrances to Antero Reservoir will be on the right. The entrance to the north access will be first, and the south second.