Upper Cretaceous aquifers

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This data set represents the extent of the Upper Cretaceous aquifers in the states of North Dakota, South Dakota, Wyoming, and Montana.

Lower Cretaceous aquifers

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This data set represents the extent of the Lower Cretaceous aquifers in the states of Montana, Wyoming, South Dakota, Kansas, Nebraska, Iowa, and Minnesota..

Paleozoic aquifers

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This data set represents the extent of the Paleozoic aquifers in the states of South Dakota, Wyoming, and Montana.

Wyoming Tertiary aquifers

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This data set represents the extent of the Wyoming Tertiary aquifers in Wyoming.

High Plains aquifer (SUPERCEDED)

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This data set represents the extent of the High Plains aquifer in the states of South Dakota, Wyoming, Nebraska, Colorado, Kansas, New Mexico, Oklahoma, and Texas. This aquifer extent has been superceded by DS543 https://water.usgs.gov/GIS/metadata/usgswrd/XML/ds543.xml

Northern Rocky Mountains Intermontane Basins aquifer system

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This data set represents the extent of the Northern Rocky Mountains Intermontane Basins aquifer system in Montana and Idaho.

Digital data set of water-level changes in the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1980 to 1996

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This data set consists of digital water-level-change contours for the High Plains aquifer in the Central United States, 1980 to 1996. The High Plains aquifer extends from south of 32 degrees to almost 44 degrees north latitude and from 96 degrees 30 minutes to 104 degrees west longitude. The aquifer underlies about 174,000 square miles in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This digital data set was created from 5,429 wells measured in both 1980 and 1996. The water-level-change contours were drawn manually on mylar. The contours were converted into a digital map at a scale of 1:1,000,000. The data should not be used at scales larger than 1:1,000,000.

Volcanic and sedimentary-rock aquifers

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This data set represents the extent of the Volcanic and sedimentary-rock aquifers in the states of Montana, Wyoming, Idaho, Nevada, California, Oregon, and Washington.

Digital data set of water-level changes in the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1980 to 1994

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This data set consists of digital water-level-change contour for the High Plains aquifer in the Central United States, 1980 to 1994. The High Plains aquifer extends from south of 32 degrees to almost 44 degrees north latitude and from 96 degrees 30 minutes to 104 degrees west longitude. The aquifer underlies about 174,000 square miles in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This digital data set was created from 6,143 wells measured in both 1980 and 1994. The water-level-change contours were drawn manually on mylar. The contours were converted into a digital map at a scale of 1:1,250,000. The data should not be used at scales larger than 1:1,250,000.