Charles F. Berkstresser Jr. 1973 <p>The study area consists of about 6,600 square miles; about 5,500 square miles of the floor of the Sacramento Valley, and about 1,100 square miles of the Sacramento-San Joaquin Delta.&nbsp; The Sacramento Valley, as defined by Bryan (1923, p. 8), extends from Red Bluff 145 miles southward to Suisun Bay.&nbsp; It is bounded on the east by the Sierra Nevada, on the northeast by the Cascade Range, on the northwest by the Klamath Mountains, and the west by the Coast Ranges.&nbsp; Southward the valley merges with the Delta and the San Joaquin Valley.&nbsp; The width of the Sacramento Valley varies from about 30 miles near Red Bluff to about 60 miles on the south, and averages about 40 miles.&nbsp; The southern boundary of the study area coincides with the northern boundary used in an earlier study be Page (1971, 1973a).</p> application/pdf 10.3133/wri7340 en U.S. Geological Survey Base of fresh ground water approximately 3,000 micromhos in the Sacramento Valley and Sacramento-San Joaquin Delta, California reports