Soda Dam

42°38′41″N 111°41′47″W / 42.64466°N 111.69635°W / 42.64466; -111.69635Purposehydroelectric powerOpening date1925Operator(s)PacifiCorpDam and spillwaysImpoundsBear RiverHeight94 ft (29 m)Length492 ft (150 m)ReservoirCreatesAlexander ReservoirTotal capacity15,760 acre⋅ft (0.01944 km³)Active capacity15,200 acre⋅ft (0.0187 km³)Surface area1.9 sq mi (4.9 km²)Normal elevation5,722 ft (1,744 m)^[1]

Soda Dam, also known as Alexander Dam (National Inventory of Dams ID ID00060), is a dam in Caribou County, Idaho, directly west of the town of Soda Springs.

The concrete dam was originally constructed in 1925, with a current height of 94 feet (29 m) and a length of 492 feet (150 m) at its crest, since a 1991 re-construction.^[2][3] It impounds Bear River for hydroelectric power, one of the hydropower facilities owned and operated by the electric utility PacifiCorp.

The reservoir it creates, Alexander Reservoir, has a normal water surface of 1.9 square miles (4.9 km²), a maximum capacity of 15,760 acre-feet, and a normal capacity of 15,200 acre-feet.^[2] Recreation includes fishing, canoeing, and birdwatching.^[4]

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