Holter Dam is a hydroelectric straight gravity dam on the Missouri River northeast of Helena.The dam, which was built between 1908 and 1918, is 1,364 feet long and 124 feet high.
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Holter Dam is a hydroelectric straight gravity dam on the Missouri River northeast of Helena.The dam, which was built between 1908 and 1918, is 1,364 feet long and 124 feet high.
