Lower Tertiary aquifers

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

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.

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High Plains aquifer (SUPERCEDED)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 This aquifer extent has been superceded by DS543 https://water.usgs.gov/GIS/metadata/usgswrd/XML/ds543.xml

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.

Upper carbonate aquifer

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This data set represents the extent of the Upper carbonate aquifer in Minnesota and Iowa.

Base of aquifer contours for the Northern High Plains aquifer

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Several pre-existing datasets that characterize portions of the Northern High Plains aquifer base were merged together in order to define the entire base of the Northern High Plains aquifer. This digital dataset consists of the aquifer base elevation contours (100-foot contour interval) for the northern portion of the High Plains aquifer in the central United States. The boundaries were chosen to simplify boundary conditions for a computer simulation model being used for a hydrologic study of the Northern High Plains.