Cascade is a rural city in and the county seat of Valley County, Idaho, United States. The population was 1,005 at the 2020 census. The Cascade Dam across the Payette River was completed in 1948, and is located in the north end of the city. The dam created Cascade Reservoir along the west side of the city. With the introduction of nearby Tamarack Resort in 2004, the name was officially changed to Lake Cascade for marketing reasons.
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