The geohydrology of Pinnacles National Monument, California

Open-File Report 67-2
Prepared in cooperation with the National Park Service U.S. Department of the Interior


  • Document: Document (pdf)
  • Plate: Figure 2 (pdf) Geologic map of Pinnacles national Monument, California, showing location of wells, favorable areas for ground-water development, and proposed well sites
  • Download citation as: RIS | Dublin Core


Water supplies for Pinnacles National Monument are obtained from a collection gallery in alluvium and from a flowing well which obtains water from fractured breccia and tuff near a fault.

Rocks other than alluvium, in all but the northern fourth of the monument, are dense igneous or metamorphic types that, unless fractured, have little potential for development of ground water. However, in some areas near faults these rocks probably will yield small supplies of water. The alluvium along Chalone Creek contains water of good chemical quality in quantities sufficient to supply the monument's needs. The Temblor Formation, a fanglomerate in the northeastern part of the monument, seems to be capable of absorbing and transmitting water but has not been drilled. A test well to determine the potential of the Temblor is suggested.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title The geohydrology of Pinnacles National Monument, California
Series title Open-File Report
Series number 67-2
DOI 10.3133/ofr672
Year Published 1967
Language English
Publisher U.S. Geological Survey
Publisher location Menlo Park, CA
Contributing office(s) U.S. Geological Survey, California Water Science Center
Description Report: iii, 14 p; 1 Figure: 17.28 x 22.78 inches
Country United States
State California
County Monterey County, San Benito County
Other Geospatial Pinnacles National Monument