MILNER LAKE AT MILNER DAM ID

RESERVOIR LEVELS
February 13, 2025


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Milner Dam-Middle, located in Twin Falls, Idaho along the Snake River, is a rockfill dam with a height of 80 feet and a storage capacity of 39,000 acre-feet. Originally completed in 1905, the dam serves primarily for irrigation purposes but also supports hydroelectric power generation and recreational activities. With a significant hazard potential and a very high risk assessment rating, Milner Dam-Middle is regulated by the Federal Energy Regulatory Commission and inspected regularly to ensure safety and compliance with state regulations enforced by the Idaho Department of Water Resources.

Managed by a private owner, Milner Dam-Middle underwent rehabilitation in 1992 by Morrison Knudsen, with the original construction designer unknown. The dam features a controlled spillway with a width of 667 feet and five Tainter (radial) outlet gates. The surrounding area encompasses a surface area of 4,000 acres and a drainage area of 17,180 square miles. Recognized for its critical role in water resource management, Milner Dam-Middle plays a vital part in sustaining agriculture and supporting local communities in the region.

As a key structure in the water infrastructure system, Milner Dam-Middle plays a crucial role in maintaining water supply reliability and supporting the local economy. With its historic significance and ongoing importance in water resource management, the dam serves as a focal point for water resource and climate enthusiasts interested in understanding the intersection of water management, infrastructure development, and environmental stewardship in the region.

Gage Height, Ft 24hr Change 0.1%
Percent of Normal 105%
Minimum 8.12 ft
2022-10-23
Maximum 11.52 ft
2021-04-13
Average 10 ft
Dam_Height 80
Hydraulic_Height 75.5
Drainage_Area 17180
Year_Completed 1905
Nid_Storage 39000
Hazard_Potential Significant
Structural_Height 80
River_Or_Stream Snake River
Primary_Dam_Type Rockfill
Surface_Area 4000
Outlet_Gates Tainter (radial) - 5
Dam_Length 404
Nid_Height 80
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