SNOFLO
 



FLANNERY

RESERVOIR LEVELS
Rock, Soil Dam Threemile Creek
April 21, 2025


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Flannery, located in Glenwood Springs, Colorado, is a private dam built in 1990 with a primary purpose of serving as a Fish and Wildlife Pond. This Earth dam, standing at 15 feet high with a hydraulic height of 13 feet, has a storage capacity of 203 acre-feet and covers a surface area of 24 acres. The dam, constructed by HIGH COUNTRY ENGINEERS, is regulated by the Colorado Department of Water Resources and undergoes regular inspections to ensure its fair condition and significant hazard potential.

Situated on Threemile Creek, Flannery plays a crucial role in providing water for fire protection, stock, irrigation, and wildlife in the surrounding area. The dam's spillway, with a width of 13 feet, is uncontrolled, allowing excess water to safely flow downstream. Despite being a man-made structure, Flannery blends into its natural surroundings with a core made of stone and foundations resting on rock and soil. The dam's two slide gates serve as outlets to manage water levels and maintain the pond's ecological balance.

Flannery's moderate risk assessment indicates a need for ongoing risk management measures to ensure the safety and integrity of the structure. With its strategic location and vital role in water resource management, Flannery stands as a testament to human ingenuity in balancing the needs of wildlife, agriculture, and emergency preparedness in a changing climate.

Year_Completed 1990
Dam_Height 15
River_Or_Stream THREEMILE CREEK
Dam_Length 200
Primary_Dam_Type Earth
Surface_Area 24
Hydraulic_Height 13
Drainage_Area 2
Nid_Storage 203
Structural_Height 16
Outlet_Gates Slide (sluice gate) - 2
Hazard_Potential Significant
Foundations Rock, Soil
Nid_Height 16
       

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