California Water Science Center (CAWSC) - San Diego Hydrogeology Project (SDH)

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San Diego Hydrogeology

Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology project website, which provides geologic and hydrologic information for the transboundary San Diego–Tijuana area, USA and Mexico. This website provides background information about the project; a variety of news items; a large amount of data, in particular for USGS multiple-depth, monitoring-well sites; geologic and hydrologic models; and additional resources including photos, illustrations, and references. Last updated: April 2016

Some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Wes Danskin
Phone: 619-225-6132
Email: wdanskin@usgs.gov

Lake Hodges - SDLH (13S/2W-12M1-3)

Lithologic Summary

Land-surface elevation is 322 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, October 5, 2012. Total depth drilled 280 feet. Screened intervals: 170-250, 90-110, and 30-50 feet.

Depth (ft) Description
From To
0 19 Sand (f-m), trace organic debris (wood/roots), abundant Mica; Dark Yellowish Brown (10YR 3/4)
19 32 Sand (f-vc) & Gravel (gran); Olive Brown (2.5Y 4/3)
32 35 Sand (f-m); Dark Yellowish Brown (10YR 3/4)
35 44 Sand (f-vc) & Gravel (gran); Olive Brown (2.5Y 4/3)
44 49 Sand (f-m), mafic, abundant mica, Coarsening downward to Olive Brown; Very Dark Grey (5Y 3/1)
49 53 Sand (f-vc) & Gravel (gran); Olive Gray (5Y 4/2)
53 54 Sandy (f) Silt; Very Dark Gray (5Y 3/1)
54 124 Sand (f-vc) & Gravel (gran); Olive Brown (2.5Y 4/3) [Weathered bedrock]
124 280 Granodiorite; Salt & Pepper [Bedrock]