Lake Powell, Arizona Exploration of area. Desert Magazine v.33 #5 My 1970 p.14-17,38-39 Lawsuit concerns filling up of lake to cover Rainbow Bridge National Monument. RMN N 27, 1970 p.5 Threatens Rainbow Bridge National Monument. Post D 9, 1970 p.84A If environmental ?roups win case, Colorado loses 800,000 acre feet of water annually. Post My 7, 1971 p.19