Strontia Springs Dam is six and one-half miles upstream of the mouth of Waterton Canyon on the South Platte River. Water is diverted from the reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant. Completed in 1983, this dam towers 243 feet above the South Platte streambed, forming a 1.7 mile-long lake with 98 surface acres.
From Denver, take 470 west towards littleton. Exit at Wadsworth Blvd (CO 121). Go about 4 miles and follow the signs to the park. Park in the lot on the left. The trail starts on the opposite side of the road.
http://www.tripleblaze.com/trail.php?c=3&i=273