Data for wells in the Modesto-Merced area, San Joaquin Valley, California

The Modesto-Merced area is in the northeastern part of the San Joaquin Valley. The area includes about 1,800 square miles that lie in the eastern portions of Merced and Stanislaus Counties. Specifically the boundaries are: North, the Stanislaus River; south, the Merced-Madera County line; east, the Merced-Mariposa and the Stanislaus-Tuolumne County lines; west, the San Joaquin River.

Between September 1970 and May 1971, 859 wells were selectively canvassed in the area. The resulting data are on file in the U.S. Geological Survey office at 2800 Cottage Way, Sacramento, Calif. Selected well data are tabulated in table 1, and the location of these wells is shown on maps 1-65. Selected chemical analyses are shown in table 2. Table 3 is a listing of the well numbers of all wells canvassed in the area by the U.S. Geological Survey through April 1971.