Old Dillon Reservoir
Scope of Work:
This project expanded the Old Dillon Reservoir from 102 Acre-feet to 288 Acre-feet of water storage. This project was funded in part by Dillon, Silverthorne and Summit County and engineered by Tetra Tech. The project consisted of removing 25,000 cubic yards of existing embankment, 25,000 cubic yards of unclassified excavation and 93,000 cubic yards of controlled embankment. This dam included very detailed and complicated underdrains, concrete-encased, steel-welded pipe and concrete structures to provide a fully-automated water control system. The valves are remotely operated from over three miles away. The Old Dillon is unique because water enters the reservoir from an inverted siphon that dips underneath I-70 from the Salt Lick Gulch. This project was coordinated with all the municipalities, the US Forest Service and Denver Water.