Junction of Highway # 12 (The Northwest Passage Scenic Byway ) South to Hells Gate State Park. Quiet and grassy campsites along the shores of the Snake River await campers to Hells Gate State Park. There are 93 campsites within 100 yards of the Snake River, offering shade trees and grass. Power and water hookups are available at 64 sites. All sites include picnic tables and barbecue grills. There are modern restrooms with showers and a nearby dump station.