Lyell Glacier

Lyell Glacier is the glacier at the head of the Lyell (main) fork of the Tuolumne River. This river is the source for the water supply of San Francisco and much of the water supply for the Bay Area, via O’Shaughnessy Dam, Lake Don Pedro, the Hetch Hetchy Aqueduct, the Irvington Gate House, The Pulgas Water Temple and Crystal Springs/ San Andreas Reservoirs. The 1883 photo shows the glacier near its historical, recent end of Little Ice Age  peak. The 1972 photo shows the glacier occupying a similar footprint, though the ice is thinner. The 2008 photo shows the substantially smaller, spit glacier. This is local evidence of global climate change. Lat./ Long. 37°44′35″N 119°16′05″W

© John P. McCormack 2018