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The area described in this report is in the northwestern part of Platte County, Wyo., in the extreme western part of the High Plains section of the Great Plains physiographic province. A reconnaissance of the geology and ground-water resources was made along the North Platte River and its tributaries-Horseshoe, Bear, and Cottonwood Creeks--to determine the possibilities of developing ground-water supplies for irrigation. The areas of rocks exposed in the GlendoWendover area are shown on a geologic map included in the report. The rock formations range in age from pre-Cambrian to Recent. The only pre-Tertiary rocks known to yield water to wells and springs in the area are the "Converse sand," a porous sandstone bed of the Hartville formation, and the Cloverly formation, which consists mainly of sandstone. Tertiary rocks in the area include the Brule and Arikaree formations. The Brule formation, a sandy siltstone, yields small amounts of water through fractures and fissures to wells; and the Arikaree sandstone, which consists mainly of fine-grained sandstone, yields water through beds of sandstone and conglomerate to wells and springs. The Quaternary alluVium is the principal waterbearing formation in the area. It consists of coarse sand and gravel containing beds and lenses of silt and clay, and readily yields water to wells. Unconfined ground water is contained in the alluvial fill of the stream valley& in sufficient quantities for irrigation supplies. Wells yielding 500 to 1,000 gpm probably could be developed from the alluvium of the North Platte River valley and of the lower ends of the valleys of the Cottonwood, Bear, and Horseshoe Creeks where the thickness of the alluvium is greatest. Ground water under artesian pressure is contained in the "Converse sand" of the Hartville formation. It is estimated that yields .of 100 gpm or more could be obtained from wells in this sand. The lateral extent of the sand and the depth at which it could be encountered throughout the area are not known; it is very likely, however, that it underlies most of the area. Ground water from several geologic sources in the Glendo-Wendover area is generally moderately mineralized, though hard. The range in dissolved solids was from 222 to 1,46o ppm, and most samples had less than 400 ppm. Concentrations of iron, chloride, fluoride, and boron normally are low except where the supply has been affected by surface drainage. Differences in the chemical character of water from shallow aquifers are attributed to local deposits of the more soluble minerals. Water from shallow wells in the valleys is similar both in concentration and in chemical character to the water in adjacent streams.. The ground water from the various geologic sources contains a low percentage of sodium and is generally of satisfactory quality for irrigation.

u.s. geological survey circular/u.s. geological survey circular

Reconnaissance of the geology and ground-water resources of the Glendo-Wendover area, Platte County, Wyoming, with a section on the chemical quality of the water