Lake Helena is a body of water along Prickly Pear Creek in the Helena Valley of Lewis and Clark County in southwestern Montana. It is 2,073 acres in size and is 3,647 ft above sea level. Completion of Hauser Dam on the Missouri River in 1907 created Hauser Lake. In addition, it created an arm of the lake, flooding 8 miles of Prickly Pear Creek and surrou…Lake Helena is a body of water along Prickly Pear Creek in the Helena Valley of Lewis and Clark County in southwestern Montana. It is 2,073 acres in size and is 3,647 ft above sea level. Completion of Hauser Dam on the Missouri River in 1907 created Hauser Lake. In addition, it created an arm of the lake, flooding 8 miles of Prickly Pear Creek and surrounding wetlands to form Lake Helena.
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