Idaho State Government--parks And Recreation Dept Of Massacre Rocks State Rockland, ID 83271 Phone : (208) 548-2672 Business Category Government Offices-State Campgrounds Recreational Vehicle Parks & Campsites Government Offices State & Local Government Offices & Public Schools Massacre Rocks State Park 3592 Park Ln American Falls, ID 83211 Phone : (208) 548-2672 Business Category Campgrounds Parks & Playgrounds Recreational Vehicle Parks & Campsites Amusement & Recreation