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Deep inside the Gunnison Tunnel
The 120-year-old, 5.8-mile tunnel was the largest irrigation tunnel in the country when it opened in 1909. It was also the first major transmountain diversion in the U.S., becoming a model for moving Western water beneath mountains, connecting wet basins with dry deserts.
Today, the Gunnison Tunnel can move more than 500,000 acre-feet of water a year, more than the entire Eastern Slope draws from the Upper Colorado River Basin.
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