GREEN MOUNTAIN RESERVOIR

RESERVOIR LEVELS
February 18, 2025


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Green Mountain, located in Summit County, Colorado, is a federal-owned dam managed by the Bureau of Reclamation for hydroelectric power generation, irrigation, and recreation purposes. Completed in 1942, this Earth dam stands at 309 feet tall and spans 1150 feet across the Blue River, with a storage capacity of 161,850 acre-feet and a surface area of 2125 acres. The dam's spillway, controlled by slide and valve gates, has a width of 75 feet, and the maximum discharge capacity is 27,000 cubic feet per second.

With a high hazard potential and a very high risk assessment rating, Green Mountain is closely regulated and inspected by the Bureau of Reclamation to ensure its structural integrity and the safety of downstream communities. The dam's emergency action plan was last revised in January 2020, and although the condition assessment is not available, regular inspections are conducted to monitor its performance. Despite being a critical piece of infrastructure, the dam poses a potential risk due to its age and the surrounding environment, emphasizing the importance of ongoing risk management measures to mitigate any potential hazards.

Storage 24hr Change -0.19%
Percent of Normal 88%
Minimum 8,145 acre-ft
1963-01-12
Maximum 155,838 acre-ft
1957-07-18
Average 75,930 acre-ft
Nid_Height 309
Hydraulic_Height 258
Drainage_Area 599
Year_Completed 1942
Dam_Height 309
Structural_Height 309
River_Or_Stream BLUE RIVER
Primary_Dam_Type Earth
Foundations Rock, Soil
Surface_Area 2125
Hazard_Potential High
Outlet_Gates Slide (sluice gate) - 2, Valve - 2
Nid_Storage 161850
Dam_Length 1150
Reservoir Levels
       

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