The Virgin River, Grand Wash, and Shivwits areas include about 3 ,250 square miles in northwestern Arizona. Ground water is obtained mainly from the alluvium, conglomerate, and basalt; however, several other formations yield small amounts of water to some wells. In the Virgin River area, most wells are less than 200 feet deep, water levels range from 17 to 310 feet below the land surface, and well yields range from a few gallons per minute to as much as 2,000 gallons per minute. Springs in the Littlefield area contribute about 70 cubic feet per second of water to the Virgin River. In the Grand Wash area wells are from 35 to 850 feet deep, and water levels range from 5 to 759 feet below the land surface. In the Shivwits area wells are from 10.5 to 300 feet deep, and water levels range from 10 to 256 feet below the land surface. The chemical quality of the water varies with location and aquifer in the report area. Information shown on the map (scale 1:125,000) includes the principal aquifer that furnishes water to wells and springs, depth to water, altitude of the water level, and specific conductance and fluoride concentrations. (Woodard-USGS)
