The US Geological Service provides this report detailing water level changes in the High Plains aquifer. Underlying one of the major agricultural regions in the world, the High Plains Aquifer includes parts of eight States -- Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. The report describes "(1) water-level changes in the High Plains aquifer from 1980 to 1997 and from 1996 to 1997, (2) the precipitation pattern in the High Plains region during 1996, and (3) estimated saturated thickness of the High Plains aquifer in 1996-97."