Potentiometric surface of the Catahoula aquifer in central Louisiana, 2013

Scientific Investigations Map 3339
Prepared in cooperation with the Louisiana Department of Natural Resources
By:  and 

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Abstract

The Catahoula aquifer is an important source of fresh groundwater in central Louisiana. In 2010, about 3.96 million gallons per day (Mgal/d) were withdrawn from the Catahoula aquifer in Louisiana.

In 2012, the U.S. Geological Survey in cooperation with the Louisiana Department of Natural Resources began a study to document current water levels in selected aquifers in Louisiana. This report presents water-level data and a map that illustrates the potentiometric surface of the Catahoula aquifer in 2013.

The Catahoula aquifer crops out in a narrow band across north-central Louisiana. This band is broken by alluvial deposits in the valleys of the Red, Little, and Ouachita Rivers that have incised into the aquifer. Saltwater ridges under the Red, Little, and Tensas River Valleys divide the freshwater extents of the Catahoula aquifer and limit the flow of freshwater between these areas. The Catahoula aquifer generally ranges in thickness from about 50 feet (ft) in the outcrop area to about 450 ft in southern Vernon Parish. Sand beds in the aquifer are generally discontinuous, lenticular, and interbedded with silts and clays.

The potentiometric surface of the Catahoula aquifer was constructed by using the altitude of water levels measured at 29 wells during the period May through September 2013. The altitude of water levels ranged from 0.02 ft above the National Geodetic Vertical Datum of 1929 (NGVD 29) in well Co-51 to 238 ft above NGVD 29 in well Na-317. Groundwater movement in the Catahoula aquifer is generally to the southeast and towards discharge areas beneath the Sabine, Red, Little, and Tensas River Valleys.

Suggested Citation

Fendick, R.B., Jr., and Carter, Kayla, 2015, Potentiometric surface of the Catahoula aquifer in central Louisiana, 2013: U.S. Geological Survey Scientific Investigations Map 3339, 1 sheet, http://dx.doi.org/10.3133/sim3339.

ISSN: 2329-132X (online)

ISSN: 2329-1311 (print)

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Hydrogeology
  • Potentiometric Surface
  • References

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Potentiometric surface of the Catahoula aquifer in central Louisiana, 2013
Series title Scientific Investigations Map
Series number 3339
DOI 10.3133/sim3339
Year Published 2015
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Louisiana Water Science Center
Description Sheet: 32.0 x 28.0 inches
Country United States
State Louisiana
County Avoyelles Parish, Catahoula Parish, Concordia Parish, Grant Parish, LaSalle Parish, Natchitoches Parish, Rapides Parish, Sabine Parish, Tensas Parish, Vernon Parish
Other Geospatial Catahoula Aquifer
Online Only (Y/N) N
Additional Online Files (Y/N) N