Digital map of aquifer boundary for the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming

This digital data set consists of aquifer boundaries for the
High Plains aquifer in the central United States. The High
Plains aquifer extends from south of 32 degrees to almost 44
degrees north latitude and from 96 degrees 30 minutes to 106
degrees west longitude. The outcrop area covers 174,000 square
miles and is present in Colorado, Kansas, Nebraska, New Mexico,
Oklahoma, South Dakota, Texas, and Wyoming.

This digital data set was compiled from a digital coverage
that was created for publication of paper maps in McGrath and
Dugan (1993, Water-level changes in the High Plains aquifer --
predevelopment to 1991: U.S. Geological Survey Water-Resources
Investigations Report 93-4088, 53 p.) The data are not intended
for use at scales larger than 1:1,000,000.