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Antero was the first dam on the South Platte River. Antero is derived from the Spanish word "first," as it was the first dam on the South Platte River near the river's origin. Originally built in 1909, this earth-fill dam is believed to occupy the site of a former lakebed, probably no more than 300 years old. Green Lake is submerged within Antero Reservoir.
From Denver take US-285 through Fairplay to US-24. About a mile south of Fairplay veer southeast on Highway 9 toward Hartsel. After about 15 miles you will reach a stop sign at the intersection with Higway 24. Turn right (west) on Highway 24. The entrances to Antero Reservoir will be on your right The entrance to the north access will be first and the entrance to the south access next.
From Co. Springs take US-24 through Hartsel to the Antero entrance on your right.