Ririe Reservoir is formed by Ririe Dam which is a major feature on the Ririe Project . Ririe Reservoir is administered by the Bonneville County Parks & Recreation Department. Access to this 1,500-acre reservoir with 32 miles of shoreline is fair to good. Fishing season runs from late May through November. Available species include rainbow, brown, and cutthroat trout. Reservoir acre feet and total reservoir capacity and cubic feet/second release rates for rivers below Upper Snake River Basin reservoirs and select river locations are updated daily and graphically provided. Site offers rest rooms, boat ramp and dock, campground, swimming, and visitor center. Boat ramp elevations.