Digital map of the test-hole and well data used to estimate the configuration of the base of the principal aquifer and the geologic units underlying the principal aquifer in the Elkhorn-Loup model area, north-central Nebraska
The U.S. Geological Survey (USGS), in cooperation with the Lewis and Clark Natural Resources District 
(NRD), Lower Elkhorn NRD, Lower Loup NRD, Lower Platte North NRD, Lower Niobrara NRD, Middle 
Niobrara NRD, Upper Elkhorn NRD, and Upper Loup NRD, have agreed to cooperatively study water 
resources from prior to the …