Moyie Dam, Gravity dam in Boundary County, Idaho, United States.
Moyie Dam is a concrete gravity dam on the Moyie River in northern Idaho that supplies water to three hydroelectric powerhouses downstream. The structure stands about 92 feet tall and operates as part of the region's water management system.
This dam was built in 1950 to replace an earlier structure from 1923. The older dam failed during a flood in 1925, leading to the construction of the current facility.
The facility represents one of three municipal hydropower sources in Idaho, contributing substantial revenue to Bonners Ferry's general fund.
You can view the dam from outside and explore the surrounding area along the river, which is accessible to visitors. The warmer months offer the best conditions for a visit when access and safety are optimal.
The older 1923 dam was a single-angle thin-arch structure that experienced a breach but did not suffer complete structural collapse. This rare outcome made it a significant case study for dam engineering history.
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