Digital map of water-level changes in the High Plains aquifer, Republican River Basin in Colorado, Kansas, and Nebraska, 2002 to 2015
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 175,000 
square miles in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, 
Texas, and Wyoming. The Republican …