Sundown Reservoir   Be the first to submit input for Sundown Reservoir. If you have info on Sundown Reservoir, Owyhee County, Idaho please submit it here to improve this web site.          These outdoors activities are available near Sundown Reservoir.   Whitewater Near Sundown Reservoir: Owyhee River, OwyheeCounty, 13 miles away       Class III - 36 miles long (Crutcher's Crossing to Three Forks) Owyhee River - South Fork, OwyheeCounty, 18 miles away       Class II-III - 36 miles long (El Paso pipeline)