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Shadow Mountain Reservoir

Shadow Mountain Dam

Located strategically between Lake Granby and Grand Lake, Shadow Mountain Reservoir receives water from the North Fork of the Colorado River and water pumped from Lake Granby.

Shadow Mountain acts as a regulating reservoir to help maintain a constant surface elevation in Grand Lake - which by law can fluctuate no more than one vertical foot - while water is diverted through the Alva B. Adams Tunnel.

Built between 1944 and 1946, the reservoir also serves as a conduit between Lake Granby and Grand Lake. Shadow Mountain is one of the principal features of the C-BT's West Slope collection and storage system.

Shadow Mountain Reservoir by the Numbers
Map of Shadow Mountain Reservoir