Roberts Tunnel

The Harold D. Roberts Tunnel, commonly known as the Roberts Tunnel, is a 23.3-mile trans-basin water diversion tunnel constructed to transport water from the Blue River Basin on Colorado’s Western Slope to the North Fork of the South Platte River on the Eastern Slope. It is considered one of the world’s longest water tunnels. Completed in 1962 after 16 years of construction, the tunnel remains a critical component of the city of Denver’s water infrastructure. It was designed to address the growing water demands of the Denver metropolitan area, particularly during periods of drought and urban expansion in the mid-20th century. The tunnel begins at Dillon Reservoir in Summit County and terminates near Grant in Park County, traversing beneath the Continental Divide at depths exceeding 4,000 feet.

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