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

Otay River - SDOR (18S/2W-23G2-6)

Lithologic Summary

Land-surface elevation is 70.85 feet above NAVD88. Depth is in feet below land surface.  Drilled by U.S. Geological Survey using hydraulic rotary, December 13, 2008. Total depth drilled 1472 feet. Screened intervals: 1420-1460, 950-970, 550-570, 220-240, and 70-90 feet.

Depth (ft) Description
From To
0 10 Gravelly sand; m-vc sand w/ granules-sm pebbles; olive gray (5Y 5/2)
10 20 Gravelly sand; m-vc sand w/ granules; grayish brown (2.5Y 5/2)
20 30 Gravelly sand; m-vc sand w/ granules; lt olive brown (2.5Y 5/4)
30 40 Gravelly sand; m-vc sand w/ granules; dk yellowish brown (10YR 4/6)
40 60 Gravel; granules-med pebbles; various colors
60 70 Clayey silt; silt w/ clay; olive (5Y 4/3)
70 80 Silty sandy gravel; granules-med pebbles w/ vf-vc sand and silt; olive gray (5Y 4/2)
80 200 Clayey silt; silt w/ clay and shell fragments; v dk gray (5Y 3/1)
200 240 Clayey silt; silt w/ clay and minor shell fragments; v dk gray (5Y 3/1)
240 320 Silt; silt; dk gray (5Y 4/1)
320 550 Clayey silt; silt w/ clay; v dk gray (5Y 3/1)
550 560 Sand; vf-coarse sand w/ shell fragments; dk gray (5Y 4/1)
560 570 Clayey silt; silt w/ clay; v dk gray (5Y 3/1)
570 580 Sandy clay; clay w/ med-coarse sand; greenish gray (10Y 5/1)
580 610 Clay; clay; grayish brown (2.5Y 5/2)
610 630 Clay; clay; grayish brown (10YR 5/2)
630 650 Clay; clay; lt brownish gray (2.5Y 6/2)
650 750 Clay; clay; grayish brown (2.5Y 5/2)
750 880 Sandy clayey silt; silt w/ clay & vf-med sand; grayish brown (2.5Y 5/2)
880 910 Clayey silty sand; vf-coarse sand w/ silt & clay; grayish brown (2.5Y 5/2)
910 920 Clay; clay; brown (10YR 5/3)
920 940 Gravelly sand; med-vc sand w/ granules-sm pebbles; grayish brown (2.5Y 5/2)
940 1,030 Clayey silty gravelly sand; vf-vc sand w/ granules, silt & clay; lt olive brown (2.5Y 5/3)
1030 1,120 Silty gravelly sand; vf-vc sand w/ granules & silt; grayish brown (2.5Y 5/2)
1120 1,140 Sandy clay; clay w/ med-vc sand; lt brownish gray (2.5Y 6/2)
1140 1,472 Clayey silty sand; vf-vc sand w/ silt & clay; grayish brown (2.5Y 5/2)