Phelps lake is a Grand Teton National park favorite. A short 1.2 mile hike from the Rockafeller Center puts you at the base of Death Canyon and Phelps Lake. The Lake is usually pretty warm, though early season, when its completely snow run off it can be a bit refreshing. The jump rock located on the Northwest shore offers a great opertunity to enjoy the lake. Its about a 20-25 foof drop into very deep water. On a warm day the rock will be crowded with locals and tourists alike enjoying the sun, jumping, and of course a few beers.