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Research about Mohave County, Arizona

Source-linked reports with geographic coverage including Mohave County, Arizona.

35 records · Page 2Linked to original sources
USGS1981

Map showing ground-water conditions in the Sacramento Valley area, Mohave County, Arizona; 1979

The Sacramento Valley area includes about 800 2 miles in northwestern Arizona and is bounded on the west by the Black and Buck Mountains and on the east by the Cerbat and Hualapai Mountains. The Black Mountains consist mainly of volcanic rocks; the Buck, Cerbat, and Hualapai Mountains consist of igneous, metamorphic, and volcanic rocks (Gillespie and Bentley, 1971, pl. 1). Sacramento Valley slopes gently southward and is underlain by alluvium and volcanic rocks to depths of more than 4,000 ft. Gillepsie and Bentley (1971, p. 1-15) divided the alluvium into three units - older, intermediate, and younger alluvium - and the volcanic rocks into two units - older and younger volcanic rocks.

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USGS1979

Map showing ground-water conditions in the Virgin River, Grand Wash, and Shivwits areas, Mohave County, Arizona, 1976

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)

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USGS1968

Use of water by riparian vegetation, Cottonwood Wash, Arizona

The change in water use as a result of the modification of riparian vegetation was measured in Cottonwood Wash, Mohave County, Ariz. A 4.1-mile length of the stream channel was selected and divided into a 2.6-mile upper reach and a 1.5-mile lower reach. Measurements of streamflow, ground-water levels, vegetation, and meteorological phenomena in the area defined the use of water by riparian vegetation under natural hydrologic conditions. Subsequent defoliation and eradication of the vegetation in the lower reach permitted the determination of the change in water use as a result of the modification. The computed average loss of water from the lower reach before modification was 80 acre-feet per growing season, a quantity which represented about 18 percent of the average flow entering the reach in the same period. The average loss after modification of the vegetation was 42 acre-feet per growing season, a quantity which represented about 12 percent of the average flow entering the reach in the same period.

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