The observation well program, begun in 1934 in cooperation with the Conservation and Survey Division, University of Nebraska, was continued during 1954. The United States Geological Survey began a series of ground-water investigations in Nebraska during the fall of 1945, as part of the program for development of the Missouri River basin. These investigations, during 1954, consisted principally of the collection and compilation of water-level data. Most of the water-level measurements in this report were obtained and all were compiled as part of the Missouri River basin development program.