American Falls Reservoir, American FallsAre you seeing what I am seeing? A 55,000-acre reservoir sitting right in the southeastern part of the state, somehow flying completely under the national radar. American Falls Reservoir is the largest of Idaho’s Snake River reservoirs, and it offers over 100 miles of shoreline for exploration. Salmon Falls Creek Reservoir, located near Rogerson and Hollister in Twin Falls County, was created by Salmon Falls Dam, an impressive structure dating back to the early 1900s. The surrounding Salmon Falls Creek Canyon also features multi-use trails for hiking and off-roading, with high desert views that open up in every direction.