|Fishing Info: American Falls Reservoir, at 56,000-acres, is the largest reservoir on the Snake River. Highway 39 rides the top of the reservoir's 9-story-high dam for over half a mile and the lake can be seen stretching northeast as far as the horizon. There are three boat ramps at the southwest end of the reservoir, one north of the dam. Parking, docks and fuel are available at the Seagull Bay Boat Club, which is a fee ramp. Parking, docks and camping are available at Willow Bay and at the West Side.