U.S. Department of the Interior

U.S. Geological Survey

Fact Sheet 2014–3074

November 2014

Prepared in cooperation with the Louisiana Department of Transportation and Development 

Water Resources of Jefferson Davis Parish, Louisiana

Introduction 

Information concerning the availability, use, and quality of 

water in Jefferson Davis Parish, Louisiana (fig. 1), is critical for 

proper water-supply management. The purpose of this fact sheet 

is to present information that can be used by water managers, 

parish residents, and others for stewardship of this vital 

resource. Information on the availability, past and current use, 

use trends, and water quality from groundwater and surfacewater sources in the parish is presented. Previously published 

reports (see References Cited section) and data stored in the 

U.S. Geological Survey’s National Water Information System 

(http://waterdata.usgs.gov/nwis) are the primary sources of the 

information presented here. 

In 2010, about 175.06 million gallons per day (Mgal/d) 

of water were withdrawn in Jefferson Davis Parish, including 

about 140.46 Mgal/d from groundwater sources and 34.61 

Mgal/d from surface-water sources1

 (table 1). Withdrawals for 

rice irrigation accounted for about 76 percent (133.09 Mgal/d) 

of the total water withdrawn (table 2). Other categories of use 

included public supply, industrial, rural domestic, livestock, 

general irrigation, and aquaculture. Water-withdrawal data 

collected at 5-year intervals from 1960 to 2010 (fig. 2) indicated 

that water withdrawals in Jefferson Davis Parish peaked in 

1980. Withdrawals for rice irrigation have ranged from a low of 

121.73 Mgal/d in 1960 to a high of 319 Mgal/d in 1980 (U.S. 

Geological Survey, 2014a). 

1

Water-withdrawal data is based on estimated or reported site-specific data and 

aggregated data, which is distributed to sources. For a full description of wateruse estimate methodology, see Data Collection in Sargent, 2011. Tabulation 

of withdrawals in the text and tables may produce different totals because of 

rounding; nonrounded numbers are used for calculation of total withdrawals.

92°50'

Base modified from U.S. Geological Survey digital data

Albers Equal-Area Conic projection

North American Datum of 1983

Evangeline

aquifer

Chicot

aquifer

system

EXPLANATION

Approximate altitude of base of fresh

 groundwater, in feet below National

 Geodetic Vertical Datum of 1929 (NGVD 29)

 (modified from Smoot, 1988; Nyman, 1989)—

 Deepest freshwater contained within Chicot 

 aquifer system, except where noted

 300 to 499

 500 to 899

 900 to 1,499

 1,500 to 2,099

Approximate boundary of area showing deepest freshwater

 contained within underlying Evangeline aquifer 

Line of section (see fig. 3)

Approximate boundary between the undifferentiated

 sand to the north and the upper and lower sands

 to the south

River subbasin boundary

Well for which hydrograph is shown

 (see fig. 4)

U.S. Geological Survey surface-water 

 discharge site and number

U.S. Geological Survey surface-water 

 quality site and number (see table 4)

JD-9

A'A

08012150

08015500

10 KILOMETERS

0

0 2 4 6 8

2 4 6 8 10 MILES

Mermentau

subbasin

Upper Calcasieu

subbasin

Mermentau Headwaters

subbasin

Fenton

Welsh

Jennings

Elton

Basile

Lake Arthur

Kinder

Mermentau

Iowa

TEXAS

ARKANSAS MISSISSIPPI

LOUISIANA JEFFERSON DAVIS

PARISH

GULF OF MEXICO

10

26

14

190

165

JD-9 08012150

08012470

08015500

08012000

Bayou Chene

Lake Arthur

River Mermentau

West Bayou

Lacassine

Bayou Serpent

Calcasieu

River

Bayou Nezpique

West Bayou Grand Marais

Bayou Lacassine

Bayou des Cannes

Bayou Plaque mine

JEFFERSON

DAVIS

PARISH

ACADIA

PARISH

EVANGELINE

PARISH

ALLEN

PARISH

CALCASIEU

PARISH

BEAUREGARD

PARISH

VERMILION

PARISH

CAMERON

PARISH

93°00'

30°20'

30°10'

92°40'

A'

A

Figure 1. Location of study area, Jefferson Davis Parish, Louisiana. 
Table 1. Water withdrawals, in million gallons per day, by source 

in Jefferson Davis Parish, Louisiana, 2010 (Sargent, 2011; B.P. 

Sargent, unpub. data, 2011).

Aquifer system or

surface-water body Groundwater Surface water

Chicot aquifer system 140.46

Bayou Chene 9.60

Bayou Lacassine 6.22

Mermentau River 3.34

West Bayou Grand Marais 0.02

Other streams 15.42

Total 140.46 34.61

Table 2. Water withdrawals, in million gallons per day, by use 

category in Jefferson Davis Parish, Louisiana, 2010 (modified from 

Sargent, 2011).

Use category Groundwater Surface water Total

Public supply 4.83 0.00 4.83

Industrial 0.09 0.00 0.09

Rural domestic 0.39 0.00 0.39

Livestock 0.16 0.00 0.16

Rice irrigation 122.51 10.58 133.09

General irrigation 0.69 0.46 1.15

Aquaculture 11.78 23.57 35.35

Total 140.46 34.61 175.06

1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010

Year

Groundwater

Surface water

EXPLANATION

Annual withdrawals, in million gallons per day

0

25

50

75

100

125

150

175

200

225

250

275

300

325

Figure 2. Water withdrawals in Jefferson Davis Parish, Louisiana, 

1960–2010 (Sargent, 2011).

Groundwater Resources 

The primary source of fresh groundwater (water with a 

chloride concentration of 250 milligrams per liter [mg/L] or less) 

in Jefferson Davis Parish is the Chicot aquifer system (fig. 3). 

The Chicot aquifer system contains freshwater to depths ranging 

from less than 400 feet (ft) below the National Geodetic Vertical 

Datum of 1929 (NGVD 29) near the northeastern corner of the 

parish to about 900 ft below NGVD 29 near the town of Jennings 

(fig. 1). The underlying Evangeline aquifer contains freshwater to 

depths greater than 1,500 ft below NGVD 29 along the northern 

border of the parish but contains saltwater (water with a chloride 

concentration greater than 250 mg/L) throughout the rest of 

the parish (Nyman, 1989). According to State well-registration 

records, there were no reported active water wells screened in the 

Evangeline aquifer in Jefferson Davis Parish in 2010.

Chicot Aquifer System

In 2003, the general direction of groundwater flow in the 

Chicot aquifer system in Jefferson Davis Parish was toward 

east-central parts of the parish (Lovelace and others, 2004). The 

direction of flow is a result of large groundwater withdrawals, 

primarily for rice irrigation in Jefferson Davis Parish and 

surrounding parishes, which are the major sources of discharge 

for the aquifer system. Recharge to the Chicot aquifer system is 

from infiltration of precipitation, vertical leakage, and lateral flow 

from other aquifers. Recharge from precipitation primarily occurs 

in areas north of Jefferson Davis Parish, where the aquifer system 

outcrops in parts of Allen, Beauregard, Evangeline, Rapides, and 

Vernon Parishes (Nyman, 1989). 

In January 2003, water levels in the aquifer system ranged 

from about 25 ft below NGVD 29 near the northwestern corner 

of the parish to about 50 ft below NGVD 29 near Jennings. 

Water levels in the Chicot aquifer system in Jefferson Davis 

Parish generally have declined 50 ft or more since groundwater 

development began around 1900 (Lovelace and others, 2004). 

Water levels in the aquifer fluctuate in response to seasonal 

pumping for irrigation. Water levels at well JD-9, located in 

central Jefferson Davis Parish (fig. 1), generally fluctuate 10–20 ft 

annually (fig. 4). Groundwater withdrawals in Jefferson Davis 

Parish in 2010 for various categories of use are presented in table 

2. About 96 percent of groundwater withdrawals (135.14 Mgal/d) 

were used for agriculture, with the majority (122.51 Mgal/d) being 

used for rice irrigation.

The Chicot aquifer system consists of a complex series of 

alternating beds of unconsolidated gravel, sand, silt, and clay 

that thicken and dip to the south at a rate of about 30 ft per mile 

(Nyman and others, 1990). In Jefferson Davis Parish, the system 

is characterized by massive beds of coarse sand and gravel 

separated by relatively thin beds of clay. In Jefferson Davis Parish, 

the Chicot aquifer system is composed of the shallow sand and 

the undifferentiated, upper, and lower sands (fig. 3). A surficial 

confining layer of clay, also called the Chicot aquifer system 

surficial confining unit, is present throughout the parish and ranges 

in thickness from 40 ft in northern parts of the parish to as much as 

240 ft in the southwestern corner of the parish (Sargent, 2004). 

The shallow sand of the Chicot aquifer system comprises 

scattered sand streaks and lenses within the surficial confining layer 

(Prakken, 2003). State well-registration records listed 20 active 
0 5

5 10 KILOMETERS

10 MILES

0

NGVD 29

+100

-200

-400

-600

-800

-1000

-1200

-1400

-1600

-1800

-2000

Vertical datum is National Geodetic Vertical Datum of 1929 (NGVD 29)

VERTICAL SCALE GREATLY EXAGGERATED

Evangeline

aquifer

Chicot aquifer system lower sand 

Chicot aquifer system upper sand 

Chicot aquifer system

lower sand 

Clay

Clay

FEET

A A’

SOUTH NORTH

Land surface

Surficial confining layer Shallow sand not shown

Chicot 

aquifer 

system

undifferentiated

sand 

NGVD 29

+100

-200

-400

-600

-800

-1000

-1200

-1400

-1600

-1800

-2000

FEET

EXPLANATION

Clay

Freshwater in sand

and gravel

Hydrogeologic contact—

Dashed where approximate

Saltwater in sand

and gravel

water wells screened in the shallow sand in Jefferson Davis Parish 

in 2010; all were domestic wells. Depths of these wells ranged 

from 13 to 105 ft below land surface, with a median depth of 22 

ft (Louisiana Department of Natural Resources, 2010). In 2010, 

there were no reported water withdrawals from the shallow sand 

in Jefferson Davis Parish.

Below the surficial confining layer and the shallow sand, 

the Chicot aquifer system consists of the undifferentiated, upper, 

and lower sands. The undifferentiated sand is a single massive 

sand present in the northern third of Jefferson Davis Parish. In the 

southern two-thirds of the parish, a clay layer generally is present, 

separating the aquifer system into the upper and lower sands. The 

altitude of the base of the Chicot aquifer system ranges from about 

400 ft below NGVD 29 in the northeastern corner of the parish to 

more than 1,000 ft below NGVD 29 at the southern boundary of 

the parish (Nyman, 1989). A transition zone from freshwater to 

saltwater is present in the lower sand at depths ranging from about 

600 to 800 ft below NGVD 29 in the central part of Jefferson 

Davis Parish (Nyman, 1989). Saltwater also is present at the base 

of the upper sand at depths ranging from about 170 to 360 ft in 

western Jefferson Davis Parish and eastern Calcasieu Parish near 

the town of Iowa. Chloride concentrations in water from wells in 

the area have ranged from 100 to 550 mg/L (Nyman, 1989). 

State well-registration records listed 1,761 active water 

wells screened in the undifferentiated, upper, and lower sands 

of the Chicot aquifer system in Jefferson Davis Parish in 2010, 

including 1,052 domestic, 608 irrigation, 69 public supply, and 32 

industrial. Eighty-two percent of the wells were screened in the 

upper sand. Depths of these wells ranged from 60 to 760 ft below 

land surface, with a median depth of 185 ft. Reported yields for 

Figure 3. Generalized southto-north hydrogeologic section 

through Jefferson Davis Parish, 

Louisiana (modified from Stanley, 

Jr., and Maher, 1944). Trace of 

section shown on figure 1. 

the wells ranged from 4 to 6,000 gallons per minute (Louisiana 

Department of Natural Resources, 2010).

Freshwater in the undifferentiated, upper, and lower sands 

of the Chicot aquifer system is generally of similar quality 

(Nyman, 1989). A statistical summary of selected water-quality 

characteristics for freshwater samples collected from 223 wells 

screened in the undifferentiated, upper, and lower sands in 

Jefferson Davis Parish is presented in table 3. Freshwater from 

the Chicot aquifer system generally is moderately hard2 and falls 

within the U.S. Environmental Protection Agency’s Secondary 

Maximum Contaminant Levels (SMCLs)3

 for chloride, color, pH, 

and dissolved solids. Samples generally exceed SMCLs for iron 

and manganese.

Surface-Water Resources 

In 2010, about 34.61 Mgal/d of surface water were 

withdrawn in Jefferson Davis Parish for rice irrigation, general 

irrigation, and aquaculture (table 2). Current and potential surfacewater sources are found in the regional Calcasieu-Mermentau 

2

Hardness ranges, expressed as milligrams per liter of calcium carbonate, are 

as follows: 0–60, soft; 61–120, moderately hard; 121–180, hard; greater than 180, 

very hard (Hem, 1985). 3

The SMCLs are nonenforceable Federal guidelines regarding cosmetic effects 

(such as tooth or skin discoloration) or aesthetic effects (such as taste, odor, or 

color) of drinking water. At high concentrations or values, health implications as 

well as aesthetic degradation might exist. SMCLs were established as guidelines 

for the States by the U.S. Environmental Protection Agency (1992). 
Year

Water level, altitude in feet (ft)

-80

-60

-40

-20

0

20

Well: JD-9

Altitude of land surface: 24.10 ft above NGVD 29

Well depth: 318 ft below land surface 

1930 1940 1950 1960 1970 1980 1990 2000 2010 2020

Figure 4. Water level in well JD-9, screened in the upper sand layer of the Chicot aquifer system in Jefferson Davis Parish, Louisiana (see 

fig. 1 for well locations; U.S. Geological Survey, 2011a). Land surface and water level are measured in feet (ft) relative to the National Geodetic 

Vertical Datum of 1929 (NGVD 29).

Table 3. Summary of selected water-quality characteristics for freshwater in the undifferentiated, upper, and lower sands of the 

Chicot aquifer system in Jefferson Davis Parish, Louisiana (U.S. Geological Survey, 2011b).

[Values are in milligrams per liter, except as noted. °C, degrees Celsius; PCU, platinum cobalt units; μS/cm, microsiemens per centimeter; SU, standard units; 

CaCO3, calcium carbonate; μg/L, micrograms per liter; SMCL, Secondary Maximum Contaminant Level established by the U.S. Environmental Protection 

Agency (2011); NA, not applicable]

Temperature(°C)Color,

(PCU)

Specific

conductance,

field

(μS/cm

at 25 °C)

pH,

field

(SU)

Hardness

(as CaCO3)

Chloride,

filtered

(as Cl)

Iron,

filtered

(μg/L as Fe)

Manganese,

filtered

(μg/L as Mn)

Dissolved

solids,

filtered

Chicot aquifer system, 1939–2009 (223 wells) 

Median 22 10 429 7.2 110 49 1,700 280 285

10th percentile 21 3 293 6.5 62 30 410 130 213

90th percentile 23 55 777 8.0 168 115 5,000 400 432

Number of 

samples

84 16 159 50 111 216 34 33 38

Percentage of 

samples that 

do not exceed 

SMCLs

NA 75 NA 88 NA 100 9 0 89

SMCLs

NA 15 NA 6.5–8.5 NA 250 300 50 500
drainage basin which is subdivided into three different drainage 

subbasins in Jefferson Davis Parish (fig. 1). The Mermentau 

Headwaters subbasin is found in the northeastern part of the 

parish and drains into the Mermentau subbasin, which is found 

in the central and southern parts of the parish and provides all 

withdrawals from identified source water bodies (19.18 Mgal/d). 

The Upper Calcasieu subbasin is found in the northwestern part 

of the parish and drains in a general southwesterly direction 

(U.S. Geological Survey, 2014b). In addition, 15.42 Mgal/d were 

withdrawn from unnamed streams (table 1). 

Freshwater availability is a concern in the Mermentau 

subbasin, which drains southern Jefferson Davis Parish 

southward through Calcasieu, Cameron, and Vermilion Parishes, 

eventually reaching the Gulf of Mexico. Although the natural 

flow is toward the Gulf of Mexico, wind and tide can reverse 

flow in the southern part of Jefferson Davis Parish. Freshwater is 

maintained in surface-water bodies by several control structures 

in Calcasieu, Cameron, and Vermilion Parishes which limit the 

potential for encroachment of saltwater from the Gulf of Mexico 

(U.S. Army Corps of Engineers, 2013). 

In northeastern Jefferson Davis Parish, the Mermentau 

Headwaters subbasin contains Bayou Nezpique, which forms 

the Mermentau River near the town of Mermentau with Bayou 

Plaquemine and Bayou des Cannes from neighboring Acadia 

Parish (fig. 1). During 1938–2013, the mean daily discharge 

of Bayou Nezpique near Basile (site number 08012000) was 

797 cubic feet per second (ft3/s) (U.S. Geological Survey, 2013). 

In northwestern Jefferson Davis Parish, the Upper Calcasieu 

subbasin contains Bayou Serpent and the Calcasieu River 

(fig. 1). During 1922–2013, the mean daily discharge for the 

Calcasieu River near Kinder (site number 08015500; fig. 1) was 

2,540 ft3/s (U.S. Geological Survey, 2013). 

In the Mermentau subbasin, 0.02 Mgal/d were withdrawn 

from West Bayou Grand Marais, 3.34 Mgal/d were withdrawn 

from Mermentau River, 6.22 Mgal/d were withdrawn from 

Bayou Lacassine, and 9.60 Mgal/d were withdrawn from Bayou 

Chene (fig. 1; table 1). During the period 1987–2005, the 

average daily discharge of Bayou Lacassine near Lake Arthur 

(site number 08012470) was about 545 ft3/s (U.S. Geological 

Survey, 2013). During the period 1989–2003, the average 

daily discharge of the Mermentau River at Mermentau (site 

number 08012150) was about 2,243 ft3/s (U.S. Geological 

Survey, 2013). Wind and tide affect discharge at both sites, and 

reverse (negative) flow can occur at times during the year (U.S. 

Geological Survey, 2006, 2011c). Lake Arthur is a shallow lake 

formed by a widening of the Mermentau River that feeds and 

drains the lake (fig. 1). The lake stage varies several feet during 

the year, but the average altitude is estimated to be about 4 ft 

above NGVD 29. At this altitude, the lake has a surface area of 

about 6 square miles and an estimated average depth of about 

7 ft (Shampine, 1971). 

Water samples collected from Bayou Lacassine near 

Lake Arthur from 1989 to 2004 (table 4) indicated that, in 

general, the water is soft and does not exceed SMCLs for pH 

and concentrations of chloride, sulfate, and iron. Dissolved 

oxygen concentrations are generally less than 5 mg/L, which 

is considered the minimum value for a diversified population 

of fresh, warmwater biota, including sport fish (Louisiana 

Department of Environmental Quality, 2008). Water samples 

collected from the Mermentau River at Mermentau during 

1979–2011 indicated that the water is generally soft. The pH 

of the water and concentrations of chloride, sulfate, and iron 

are generally below the SMCLs (table 4). Dissolved oxygen 

concentration is generally less than 5 mg/L. The water quality 

of Lake Arthur generally is similar to the water quality of the 

Mermentau River (Shampine, 1971). 

References Cited 

Louisiana Department of Environmental Quality, 2008, Environmental 

Regulatory Code, Title 33, Part IX, Subpart 1: Baton Rouge, Louisiana 

Department of Environmental Quality, accessed June 9, 2009, at http:www.

deq.louisiana.gov/portal/tabid/1674/Default.aspx.

Louisiana Department of Natural Resources, 2010, Strategic Online Natural 

Resources Information System (SONRIS): Louisiana Department of Natural 

Resources database, accessed August 17, 2010, at http://sonris.com/.

Lovelace, J.K., Fontenot, J.W., and Frederick, C.P., 2004, Withdrawals, water 

levels, and specific conductance in the Chicot aquifer system in southwestern 

Louisiana, 2000–03: U.S. Geological Survey Scientific Investigations Report 

2004–5212, 56 p., accessed December 6, 2012, at http://pubs.er.usgs.gov/

publication/sir20045212.

Nyman, D.J., 1989, Quality of water in freshwater aquifers in southwestern 

Louisiana: Louisiana Department of Transportation and Development Water 

Resources Technical Report no. 42, 22 p., 28 pls. 

Nyman, D.J., Halford, K.J., and Martin, Angel, Jr., 1990, Geohydrology and 

simulation of flow in the Chicot aquifer system of southwestern Louisiana: 

Louisiana Department of Transportation and Development Water Resources 

Technical Report no. 50, 58 p. 

Prakken, L.B., 2003, Quality of water used for domestic supply in the 

Chicot aquifer system of southwestern Louisiana, 1994–2001: Louisiana 

Department of Transportation and Development Water Resources Technical 

Report no. 71, 48 p. 

Sargent, B.P., 2004, Thickness of the Chicot aquifer system surficial confining 

unit and location of shallow sands, southwestern Louisiana: Louisiana 

Department of Transportation and Development Water Resources Technical 

Report no. 73, 29 p. 

Sargent, B.P., 2011, Water use in Louisiana, 2010: Louisiana Department of 

Transportation and Development Water Resources Special Report no. 17, 

135 p. 

Shampine, W.J., 1971, Chemical, biological, and physical data for the major 

lakes and reservoirs in Louisiana: Louisiana Department of Public Works 

Basic Records Report no. 5, 98 p. 

Smoot, C.W., 1988, Louisiana hydrologic atlas map no. 3—Altitude of the 

base of freshwater in Louisiana: U.S. Geological Survey Water-Resources 

Investigations Report 86–4314, 1 sheet, accessed November 2, 2011, at 

http://pubs.er.usgs.gov/publication/wri864314.

Stanley, T.B., Jr., and Maher, J.C., 1944, Ground-water resources of Jefferson 

Davis and Acadia Parishes, Louisiana: Louisiana Department of Public 

Works, 93 p.

U.S. Army Corps of Engineers, 2013, Lock and waterway status 60 day 

forecast: U.S. Army Corps of Engineers, New Orleans District, accessed 

June 18, 2014, at http://www.mvn.usace.army.mil/portals/56/docs/

navigation/05_lockstatus28Mar13.pdf.

U.S. Environmental Protection Agency, 1992, Secondary drinking water 

regulations—Guidance for nuisance chemicals: U.S. Environmental 

Protection Agency publication EPA 810/K-92-001, 4 p., accessed July 29, 

2009, at http://water.epa.gov/drink/contaminants/secondarystandards.cfm.

U.S. Environmental Protection Agency, 2011, 2011 Edition of the drinking 

water standards and health advisories: U.S. Environmental Protection 

Agency publication EPA 820-R-11-002, Office of Water, 12 p., accessed 

September 2, 2011, at http://water.epa.gov/action/advisories/drinking/upload/

dwstandards2011.pdf.
Table 4. Summary of selected water-quality characteristics for Bayou Lacassine and Mermentau River in Jefferson Davis Parish, 

Louisiana (U.S. Geological Survey, 2011b).

[Values are in milligrams per liter, except as noted. μS/cm, microsiemens per centimeter; °C, degrees Celsius; SU, standard units; CaCO3, calcium carbonate; 

μg/L, micrograms per liter; <, less than; SMCL, Secondary Maximum Contaminant Level established by the U.S. Environmental Protection Agency (2011); NA, 

not applicable]

Specific

conductance,

field (μS/

cm

at 25 °C)

Oxygen,

dissolved

pH,

field

(SU)

Hardness

(as 

CaCO3

)

Calcium,

filtered

(as Ca)

Magnesium,

filtered

(as Mg)

Sodium,

filtered

(as Na)

Chloride,

filtered

(as Cl)

Sulfate,

filtered

(as SO4

)

Iron,

filtered

(μg/L as 

Fe)

Bayou Lacassine near Lake Arthur, 1989–20041

Median 169 4.0 7.2 43 9.6 4.3 21 22 4.6 110

10th percentile 103 0.8 6.7 28 6.8 2.6 12 9.6 2.3 <30

90th percentile 371 7.0 7.8 66 14 7.7 62 76 11 290

Number of samples 72 62 72 46 46 47 47 69 69 47

Percentage of samples 

that do not exceed 

SMCLs

NA NA 96 NA NA NA NA 97 100 91

Mermentau River at Mermentau, 1979–20112

Median 163 4.0 7.1 40 10 3.6 15 17 4.2 170

10th percentile 70 1.1 6.2 17 4.5 1.6 5.7 6.7 2.3 20

90th percentile 329 7.0 7.6 77 18 7.6 39 37 8.4 340

Number of samples 192 176 192 126 126 126 124 188 187 103

Percentage of samples 

that do not exceed 

SMCLs

NA NA 84 NA NA NA NA 100 100 79

SMCLs

NA NA 6.5–8.5 NA NA NA NA 250 250 300

1

Site number 08012470.

2

Site number 08012150

U.S. Geological Survey, 2006, Annual water-data report 2005 [data for 

08012470 Bayou Lacassine near Lake Arthur, LA]: USGS Water Resources 

of the United States, Publications—Annual Water Data Reports, p. 522, 

accessed July 29, 2011, at http://pubs.usgs.gov/wdr/2005/wdr-la-05-1/.

U.S. Geological Survey, 2011a, Groundwater levels for Louisiana: National 

Water Information System Web Interface, accessed July 28, 2011, at

http://nwis.waterdata.usgs.gov/la/nwis/gwlevels.

U.S. Geological Survey, 2011b, Water-quality samples for Louisiana: National 

Water Information System Web Interface, accessed July 28, 2011, at

http://nwis.waterdata.usgs.gov/la/nwis/qwdata.

U.S. Geological Survey, 2011c, Annual water-data report—Water-data report 

2010 [data for 08012150 Mermentau River at Mermentau, LA]: U.S. 

Geological Survey Water Resources of the United States, accessed July 29, 

2011, at http://wdr.water.usgs.gov/wy2010/pdfs/08012150.2010.pdf.

U.S. Geological Survey, 2013, USGS surface-water daily statistics for the 

Nation: National Water Information System Web Interface, accessed 

October 25, 2013, at http://waterdata.usgs.gov/nwis/dvstat?referred_

module=sw.

U.S. Geological Survey, 2014a, U.S. Geological Survey Water Resources 

Cooperative Program—Louisiana Water Use Program, 1960–2010 data: 

Accessed September 3, 2014, at http://la.water.usgs.gov/WaterUse/default.

asp.

U.S. Geological Survey, 2014b, Science in your watershed: Accessed June 18, 

2014, at http://water.usgs.gov/wsc/acc/080802.html.

This fact sheet was published by the U.S. Geological 

Survey, in cooperation with the Louisiana Department 

of Transportation and Development (DOTD). Thanks 

are given to Zahir “Bo” Bolourchi, Director, Water 

Resources Programs, DOTD, who contributed to the 

content of the fact sheet.

By Vincent E. White and Lawrence B. Prakken

For additional information, contact: 

Director, USGS Lower Mississippi-Gulf Water Science Center

3535 S. Sherwood Forest Blvd., Suite 120

Baton Rouge, LA 70816

E-mail: gs-w-lmg_center_director@usgs.gov

Fax: (225) 298–5490

Telephone: (225) 298–5481

Home Page: http://la.water.usgs.gov

ISSN 2327-6916 (print)

ISSN 2327-6932 (online)

http://dx.doi.org/10.3133/fs20143074