The geology of the Moses Lake North quadrangle was mapped in 1954 and 1958 by the U.S. Geological Survey. Some of the basic hydrologic data has been collected by the Geological Survey during the early investigations of ground-water conditions in the Quincy Basin (Henshaw, written communication, 1917; Schwennesen and Meinzer, 1918). Most of the data, however, were obtained by the Geological Survey since 1941, in cooperation with the U.S. Bureau of Reclamation and the Washington State Department of Conservation under continuing programs in the area of the Columbia Basin Project of the Bureau of Reclamation. Some preliminary geologic field work in the Moses Lake North quadrangle was done by the Geological Survey in 1954 in cooperation with the Washington State Department of Conservation.