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In cooperation with the City of Laredo

Hydrogeology of Webb County, Texas

By Rebecca B. Lambert

U.S. Geological Survey
Scientific Investigations Report 2004–5022


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Text, figures, and tables are linked below in the Table of Contents and or the
zipped plates in pdf

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36" X 24" (4,388 KB)
Sheet 2. 
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Sheet 7. 
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Contents

Introduction

Previous Studies

Methods

Acknowledgments

Geologic Setting

Hydrogeology

Gulf Coast Aquifer

Jackson and Yegua Aquifers

Laredo Aquifer

El Pico Confining Unit, Queen City-Bigford Aquifer, and Reklaw Confining Unit

Carrizo Aquifer

Summary

Figures

1. 
Location of the city of Laredo and smaller cities in Webb County
2. 
Location of inventoried and sampled wells
3. 
Location of geophysical log control points
4. 
Surface geology of Webb County and location of geologic sections
5. 
Structural features affecting Tertiary deposits in Webb County
6. 
Geologic dip section A–A' across northern Webb County
7. 
Geologic dip section B–B' across southern Webb County
8. 
Geologic strike section C–C' in northwest Webb County
9. 
Geologic strike section D–D' trending north-south in central Webb County
10. 
Geologic strike section E–E' in eastern Webb County
11. 
Extent of the Gulf Coast aquifer outcrop and depth of water level in wells, 1996–97
12. 
Altitude of the top of the Gulf Coast aquifer
13. 
Thickness of the Gulf Coast aquifer
14. 
Net sand thickness of the Gulf Coast aquifer
15. 
Specific capacity and estimated transmissivity of the Gulf Coast aquifer
16. 
Chemical characteristics of water from the Gulf Coast aquifer
17. 
Extent of the Jackson aquifer outcrop and subsurface extent of the aquifer
18. 
Altitude of the top of the Jackson aquifer
19. 
Thickness of the Jackson aquifer
20. 
Net sand thickness of the Jackson aquifer
21. 
Chemical characteristics of water from the Jackson and Yegua aquifers
22. 
Extent of the Yegua aquifer outcrop, subsurface extent of the aquifer, and depth of water level in wells, 1996–97
23. 
Altitude of the top of the Yegua aquifer
24. 
Thickness of the Yegua aquifer
25. 
Net sand thickness of the Yegua aquifer
26. 
Extent of the Laredo aquifer outcrop, subsurface extent of the aquifer, and depth of water level in wells, 1996–97
27. 
Altitude of the top of the Laredo aquifer
28. 
Thickness of the Laredo aquifer
29. 
Net sand thickness of the Laredo aquifer
30. 
Specific capacity and estimated transmissivity of the Laredo aquifer
31. 
Chemical characteristics of water from the Laredo aquifer
32. 
Extent of the Queen City-Bigford aquifer and El Pico confining unit outcrops, subsurface extent of the Queen City-Bigford aquifer and El Pico confining unit, and depth of water level in wells completed in the El Pico confining unit, 1996
33. 
Altitude of the top of the El Pico confining unit
34. 
Thickness of the El Pico confining unit
35. 
Altitude of the top of the Queen City-Bigford aquifer
36. 
Thickness of the Queen City-Bigford aquifer
37. 
Net sand thickness of the Queen City-Bigford aquifer
38. 
Altitude of the top of the Reklaw confining unit
39. 
Thickness of the Reklaw confining unit
40. 
Extent of the Carrizo aquifer outcrop, subsurface extent of the aquifer, and depth of water level in wells, 1997–98
41. 
Altitude of the top of the Carrizo aquifer
42. 
Thickness of the Carrizo aquifer
43. 
Net sand thickness of the Carrizo aquifer
44. 
Specific capacity and estimated transmissivity of the Carrizo aquifer
45. 
Chemical characteristics of water from the Carrizo aquifer

Tables

1. 

Summary of the lithologic and hydrologic properties of the hydrogeologic units in Webb County, Texas or
pdf version (268 KB)

2. 
Specific capacity and estimated transmissivity of the Gulf Coast, Jackson, Laredo, and Carrizo aquifers
or
pdf version (219 KB)
3. 
Water quality of the Gulf Coast aquifer
or
pdf version (250 KB)
4. 
Water quality of the Jackson and Yegua aquifers
or
pdf version (243 KB)
5. 
Water quality of the Laredo aquifer
or
pdf version (238 KB)
6. 
Water quality of the Carrizo aquifer
or
pdf version (265 KB)

DATUM

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).
Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).


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