U.S. Department of the Interior

U.S. Geological Survey

Open-File Report 2012–1056

Prepared in cooperation with the Louisiana Coastal Area Science and Technology Program

Water-Quality, Bed-Sediment, and Discharge Data for the 

Mississippi River-Gulf Outlet and Adjacent Waterways, 

Southeastern Louisiana, August 2008 Through December 

2009
Cover: Construction of the rock barrier across the Mississippi River Gulf Outlet in early June 2009 

(photograph by Dennis K. Demcheck, U.S. Geological Survey). 
Water-Quality, Bed-Sediment, and 

Discharge Data for the Mississippi RiverGulf Outlet and Adjacent Waterways, 

Southeastern Louisiana, August 2008 

Through December 2009

By Christopher M. Swarzenski, Scott V. Mize, and John K. Lovelace

Prepared in cooperation with the Louisiana Coastal Area Science and 

Technology Program

Open-File Report 2012–1056

U.S. Department of the Interior

U.S. Geological Survey
Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Swarzenski, C.M., Mize, S.V., and Lovelace, J.K., 2012, Water-quality, bed-sediment, and discharge data for the 

Mississippi River-Gulf Outlet and adjacent waterways, southeastern Louisiana, August 2008 through December 2009: 

U.S. Geological Survey Open-File Report 2012–1056, 52 p.

U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2012

This and other USGS information products are available at http://store.usgs.gov/

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U.S. Government.
iii

Acknowledgements

The authors thank Barbara Kleiss of the U.S. Army Corps of Engineers, and James Pahl 

of the Coastal Protection and Restoration Authority of Louisiana for their assistance with the 

execution of the project.

v

Contents

Acknowledgements .....................................................................................................................................iii

Abstract ..........................................................................................................................................................1

Introduction ....................................................................................................................................................1

Purpose and Scope .............................................................................................................................1

Description of the Study Area ...........................................................................................................1

Methods ..........................................................................................................................................................3

Water-Quality, Bed-Sediment, and Discharge Data ...............................................................................3

References .....................................................................................................................................................9

Figures

1. Map showing location of data-collection sites in the Mississippi River-Gulf Outlet 

and adjacent waterways ............................................................................................................2

2. Graphs showing daily mean temperature and specific conductance at selected 

sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and the Inner 

Harbor Navigation Canal (IHNC), January through December 2009 ...................................4

3. Graphs showing channel cross sections at locations in the Mississippi River-Gulf 

Outlet (MRGO) and Lake Borgne, Louisiana ............................................................................5

4. Graphs showing channel cross sections at locations in the Mississippi River-Gulf 

Outlet (MRGO), Louisiana ...........................................................................................................6

5. Graphs showing channel cross sections at locations in the Mississippi River-Gulf 

Outlet (MRGO), Louisiana ...........................................................................................................7

6. Graphs showing channel cross sections at locations in the Mississippi River-Gulf 

Outlet (MRGO), Louisiana ...........................................................................................................8

Tables

1. Data-collection sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, 

Violet Canal, and the Inner Harbor Navigation Canal in southeastern Louisiana, 

August 2008 through December 2009 .....................................................................................10

2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), 

Lake Borgne, and Violet Canal in southeastern Louisiana, August 2008 through 

December 2009 ...........................................................................................................................11

3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in 

southeastern Louisiana, January through December 2009 ................................................39

4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees 

Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and 

the Inner Harbor Navigation Canal in southeastern Louisiana, January through 

December 2009 ...........................................................................................................................45

5. Grain-size distribution and loss on ignition for bed sediment collected at selected 

sites in the Mississippi River-Gulf Outlet (MRGO) in southeastern Louisiana, 

June 10, 2009. ..............................................................................................................................51

6. Instantaneous discharge at selected sites in the Mississippi River-Gulf Outlet 

(MRGO) in southeastern Louisiana on March 9 and June 17, 2009 ...................................52
vi

Conversion Factors

Inch/Pound to SI

Multiply By To obtain

Length

inch (in.) 25.4 millimeters (mm)

inch (in.) 2.54 centimeter (cm)

foot (ft) 0.3048 meter (m)

Area

square foot (ft2

) 0.09290 square meter (m2)

Volume

cubic foot (ft3

) 0.02832 cubic meter (m3) 

Flow rate

foot per second (ft/s) 0.3048 meter per second (m/s)

cubic foot per second (ft3

/s) 0.02832 cubic meter per second (m3/s)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F =(1.8x°C)+32

Horizontal coordinate information is referenced North American Datum of 1927 (NAD 27).

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (μS/cm at 

25°C).

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) 

or micrograms per liter (μg/L).
Abstract 

The Mississippi River-Gulf Outlet navigation channel 

(MRGO) was constructed in the early 1960s to provide a 

safer and shorter route between the Gulf of Mexico and the 

Port of New Orleans for deep-draft, ocean-going vessels and 

to promote the economic development of the Port of New 

Orleans. In 2006, the U.S. Army Corps of Engineers developed a plan to de-authorize the MRGO. The plan called for a 

rock barrier to be constructed across the MRGO near Bayou 

La Loutre. In 2008, the U.S. Geological Survey, in cooperation with the Louisiana Coastal Area Science and Technology 

Program began a study to document the impacts of the rock 

barrier on water-quality and flow before, during, and after its 

construction. Water-quality, bed-sediment, and discharge data 

were collected in the MRGO and adjacent water bodies from 

August 2008 through December 2009. 

Introduction

The Mississippi River-Gulf Outlet navigation channel 

(MRGO) (fig. 1) was constructed in the early 1960s to provide 

a safer and shorter route between the Gulf of Mexico and the 

Port of New Orleans for deep-draft, ocean-going vessels and 

to promote the economic development of the Port of New 

Orleans. The MRGO was envisioned as a major commercial 

asset for the region (Shaffer and others, 2009).

However, decreased ship traffic, environmental concerns, 

and Hurricane Katrina in August 2005 caused the U.S. Army 

Corps of Engineers (USACE) to de-authorize the MRGO in 

2006. The de-authorization plan called for a rock barrier to 

be constructed across the MRGO near Bayou La Loutre (U.S. 

Army Corps of Engineers, 2010). By blocking or limiting 

tidal exchange in the MRGO, the rock barrier could affect 

water quality and flow in the MRGO and water quality in 

Lake Pontchartrain and Lake Borgne. In 2008, in cooperation with the Louisiana Coastal Area Science and Technology Program, a collaboration between the USACE and the 

Coastal Protection and Restoration Authority of Louisiana, the 

U.S. Geological Survey (USGS) began a study to document 

the impacts of the rock barrier before, during, and after its 

construction. 

Purpose and Scope

This report presents water-quality, bed-sediment, and 

discharge data collected in the MRGO and adjacent water 

bodies from August 2008 through December 2009. These 

data represent conditions in the MRGO before, during, and 

immediately after construction of a rock barrier across the 

MRGO near Bayou La Loutre. Discrete and continuous waterquality data collected in the MRGO upstream and downstream 

from the rock barrier and in Lake Borgne, Violet Canal, and 

the Inner Harbor Navigation Canal (IHNC) are presented in 

tables and figures. Bed-sediment and discharge data collected 

or measured at selected sites in the MRGO are presented in 

tabular format. A map shows the location of data-collection 

sites (fig. 1).

Description of the Study Area

The MRGO, located in southeastern Louisiana, trends 

in a northwesterly-southeasterly direction and extends from 

the Gulf Intracoastal Waterway (GIWW) near Michoud, La., 

through Breton Sound into the 38-foot (ft) depth contour in 

the Gulf of Mexico (fig. 1). All reaches of the MRGO were 

authorized to be 36-ft deep with a bottom width of 500 ft 

except in Breton Sound, where it was authorized to be 38-ft 

deep, with a 600-ft bottom width. Construction of the channel 

began in March 1958 near the IHNC and the GIWW. By July 

1963, an interim channel had been completed to the full design 

depth but only half of the design width, and the first vessel had 

traveled down the channel. By 1968, all dredging had been 

completed, and the channel was at the full design dimensions. 

By 2006 erosion had widened the channel from the original 

500 ft to more than 1,500 ft in many places, whereas damage 

caused by Hurricane Katrina in August 2005 had reduced the 

Water-Quality, Bed-Sediment, and Discharge Data for the 

Mississippi River-Gulf Outlet and Adjacent Waterways, 

Southeastern Louisiana, August 2008 Through December 

2009

By Christopher M. Swarzenski, Scott V. Mize, and John K. Lovelace
Figure 1. Location of data-collection sites in the Mississippi River-Gulf Outlet and adjacent waterways.

90°00' 89°50' 89°40' 89°30' 89°20' 89°10'

30°00'29°50'29°40'29°30'

0 10 20 KILOMETERS

0 10 20 MILES Instantaneous discharge site and number Water-quality transect or point and number

Water-quality meter site and number (see table 1)

EXPLANATION

073802332

294047089232700

295634089502000

Base map modified from Microsoft Bing Maps (2010)

New Orleans

Violet

Michoud

Hopedale

Yscloskey

294047089232700

295157089423200

294946089361900

073802332

295311089445100

294900089350800

294805089335200

295556089494400

294608089310500

294414089282400

3000189089551200

295655089495600

295634089502000

295602089501600

295709089511200

Mississippi River

Mississippi

Gulf Intracoastal Waterway Inner Harbor Navigation Canal

LakeBorgne

LakePontchartrain

Violet Canal

 River-Gulf Outlet

BayouLa Loutre

BretonSound

Rock

barrier
Water-Quality, Bed-Sediment, and Discharge Data 3

channel depth to 22 ft in places, which restricted deep-draft 

vessel access (U.S. Army Corps of Engineers, 2010). 

The MRGO was dredged through shallow bays, coastal 

marshes, and cypress swamps. The channel changed local 

and regional hydrologic circulation patterns and allowed 

saltwater from the Gulf of Mexico to enter wetlands that were 

dominated by vegetation with a low tolerance to salinity. In 

addition to the direct loss of wetlands caused by the channel 

construction, the increased salinity could have exacerbated 

wetland loss and conversion of freshwater marsh to brackish or saltwater marsh in areas adjacent to the MRGO. The 

MRGO also altered salinity in Lake Pontchartrain and Lake 

Borgne (Shaffer and others, 2009).

The MRGO was de-authorized in 2008. An important 

feature of the de-authorization was the placement of a rock 

barrier across the channel near the Bayou La Loutre Ridge 

near Hopedale, La., to limit tidal exchange and prevent navigation. Construction of the rock barrier began in February 

2009 with the placement of a wide rock base along the channel 

bottom. The rock barrier was extended above the water surface 

for the entire channel width on June 4, 2009. The rock barrier, 

reaching a height of 7 ft above average water levels, was completed at the end of July. Details of the deauthorization and 

closure can be found on the web at http://www.mrgo.gov.

Methods

A multiparameter water-quality meter was used to measure specific conductance, pH, temperature, dissolved oxygen, 

and salinity at various depths along transects in the MRGO 

and at selected points in adjacent waterways. Measurements 

along transects were made at three or five evenly spaced points 

across the full width of the channel. Vertical profiles of water 

quality were measured at three points where the channel was 

about 900 ft wide and at five points where the channel width 

was greater than about 900 ft. At each point, vertical waterquality profiles were made by making measurements at every 

5 or 10 ft of depth starting at 0.5 ft from the channel bottom 

and ending at 0.5 ft from the water surface. Channel widths 

and the distances from the banks were determined using a 

laser range finder. The water-quality meter was calibrated for 

each parameter on each day; measurements were made following USGS field methods presented in Wilde (variously dated). 

Temperature and specific conductance were measured and 

recorded at 60- or 120-minute intervals by continuous waterquality meters suspended in the water column at selected 

monitoring sites. The meters were suspended in stilling wells 

attached to existing structures or galvanized steel pipes driven 

into the channel bottom. The stilling wells were constructed 

of 2-inch (in.) polyvinyl-chloride (PVC) pipe with 18 in. of 

perforated copper pipe at the bottom to inhibit the growth of 

algae on the monitor’s sensors. The meters were serviced and 

calibrated during routine site visits using methods described 

in Wagner and others (2006). Temperature data recorded by 

the meters are not included herein, but are on file at the USGS 

office in Baton Rouge, La.

Bed-sediment samples were collected using a Petite 

Ponar bottom-material sampler at each transect. The samples 

were collected at three evenly spaced locations to the left, 

right, and center of the channel at each transect and composited in the field using techniques discussed in Radtke (2005). 

The silt and clay fraction of the composited sample was 

determined using dry sieve and hydrometer analyses using 

techniques discussed in Guy (1969). The amounts of organic 

matter in the samples were determined by measuring the loss 

on ignition at 550 degrees Celsius using techniques discussed 

in Fishman and Friedman (1989). All sediment analyses were 

performed at the USGS sediment laboratory in Baton Rouge.

Instantaneous discharge measurements were made using 

a 1,200 kilohertz boat-mounted Acoustic Doppler Current Profiler (ADCP) following standard USGS protocol (Simpson and 

Oltmann, 1993). Depth profiles of the channel bottom were 

made using the ADCP. 

Water-Quality, Bed-Sediment, and 

Discharge Data

Specific conductance, pH, temperature, dissolved oxygen, 

and salinity were measured at seven transects in the MRGO 

and at single points in Lake Borgne and Violet Canal from 

August 2008 through December 2009 (fig. 1; tables 1 and 2 

at end of report). Measurements generally were made over 

1- or 2-day periods every 4 to 6 weeks during June through 

September and about every 8 weeks during October through 

May. Measurements made during August and November 2008 

and January and March 2009 document conditions before the 

barrier breached the water surface. Measurements made from 

June to December 2009 document conditions in MRGO subsequent to barrier completion. 

After hypoxic conditions (dissolved oxygen concentration less than 2 milligrams per liter [mg/L]) were documented 

downstream from the rock barrier at transects near miles 30 

and 34 during June 2009 (table 2), water quality was measured 

along two additional transects near miles 20 and 27 (fig. 1) 

further downstream towards the Gulf of Mexico to track the 

extent of hypoxic conditions. 

Six continuous water-quality meters were deployed at 

three sites in the MRGO and one site each in Lake Borgne and 

the IHNC in late December 2008 to record both short-term 

(less than one month) and long-term water-quality changes 

(fig. 1). The meters were suspended at a depth of 10 ft below 

the water surface at sites in the MRGO near miles 35, 46, and 

59; at a depth of 10 ft at the site in the IHNC; and at a depth of 

6 ft at the site in Lake Borgne near the MRGO. An additional 

meter was suspended 20 ft below the water surface at a site in 

the MRGO near mile 46 to enable limited evaluation of salinity stratification. Figure 2 and tables 3 and 4 at end of report 
4 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Figure 2. Daily mean temperature and specific conductance at selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake 

Borgne, and the Inner Harbor Navigation Canal (IHNC), January through December 2009. Specific conductance, in microsiemens per centimeter at 25 degrees Celsius

0

10,000

20,000

30,000

40,000

50,000

Temperature, in degrees Celisus

0

10

20

30

40

Jan. Feb. Mar. Apr. May June

2009

July Aug. Sept. Oct. Nov. Dec.

June 4, 2009 rock barrier

extends above water line

across the entire channel

Daily mean temperature and specific conductance,

 by site—Dashed line indicates missing data

 294900089350800 (MRGO near mile 35)

 295311089445100 (MRGO near mile 46)

 300018089551200 (MRGO near mile 59)

 295634089502000 (Lake Borgne)

 0738023321 (IHNC)

EXPLANATION
Water-Quality, Bed-Sediment, and Discharge Data 5

present the daily mean temperature and specific conductance 

at the sites from January through December 2009.

Placement of the continuous meters was primarily limited to existing structures in the channel because of concerns 

about boat traffic and cost and time constraints on the construction of new data-collection platforms. Existing structures in the MRGO included navigation markers located in 

relatively shallow water near the sides of the deeper shipping 

lane. Hence, the maximum depths at which the meters could 

be placed in the MRGO generally were limited to about 10 

ft below the water surface. Because the depth of the shipping 

lane generally ranged from 35 to 40 ft in most places, higher 

specific conductance values than those measured could have 

been present at greater depths because of salinity stratification. During the project, vertical profiles of water quality along 

the transects were found to provide a more comprehensive 

indication of channel salinity stratification than the continuous 

water-quality meters. 

Bed-sediment samples were collected at the initial seven 

transect sites on June 6, 2009, to document the character of the 

sediment in the MRGO prior to any changes that might occur 

as the result of rock barrier and reduced flow. The samples 

were analyzed for grain size and the amounts of mineral 

and organic matter (loss on ignition) (table 5 at end of report). 

Samples represent conditions in the uppermost 4–6 in. of 

bed sediment. The collected data provide a baseline for 

conditions in the MRGO at the beginning of the rock barrier 

placement.

Instantaneous discharge was measured at the transect 

sites in the MRGO and at the opening into Lake Borgne on 

March 9 and June 17, 2009 (table 6 at end of report). These 

two sampling dates represent conditions before and after the 

barrier affected tidal exchange. Figures 3–6 show channel 

cross-sections at the transect sites in the MRGO and Lake 

Borgne in southeastern Louisiana on March 9, 2009, when 

construction of the rock barrier had just started.

Figure 3. Channel cross sections at locations in the Mississippi River-Gulf Outlet (MRGO) and Lake Borgne, Louisiana.

12.5

25.0

37.5

50.0

0

12.5

25.0

37.5

50.0

0

Depth below water surface, in feet

0 200 400 600 800 1,000 1,200

Distance from left bank, in feet

Vertical scale is exaggerated

300018089551200 MRGO near mile 59 near Michoud, La.

295634089502000 Lake Borgne at MRGO near Violet, La.
6 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Figure 4. Channel cross sections at locations in the Mississippi River-Gulf Outlet (MRGO), Louisiana.

12.5

25.0

37.5

50.0

0

12.5

25.0

37.5

50.0

0

Depth below water surface, in feet

0 200 400 600 800 1,000 1,200

Distance from left bank, in feet

Vertical scale is exaggerated

295556089494400 MRGO near mile 52 near Violet, La.

295709089511200 MRGO near mile 54 near Violet, La.
Water-Quality, Bed-Sediment, and Discharge Data 7

Figure 5. Channel cross sections at locations in the Mississippi River-Gulf Outlet (MRGO), Louisiana.

12.5

25.0

37.5

50.0

0

12.5

25.0

37.5

50.0

0

Depth below water surface, in feet

0 200 400 600 800 1,000 1,200

Distance from left bank, in feet

Vertical scale is exaggerated

295157089423200 MRGO near mile 44 near Yscloskey, La.

294946089361900 MRGO near mile 37 near Hopedale, La.
8 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Figure 6. Channel cross sections at locations in the Mississippi River-Gulf Outlet (MRGO), Louisiana.

12.5

25.0

37.5

50.0

0

12.5

25.0

37.5

50.0

0

Depth below water surface, in feet

Distance from left bank, in feet

Vertical scale is exaggerated

0 200 400 600 800 1,000 1,200 1,400 1,600 1,800

294608089310500 MRGO near mile 30 near Hopedale, La.

294805089335200 MRGO near mile 34 near Hopedale, La.
References 9

References

Fishman, M.J., and Friedman, L.C., 1989, Methods for 

determination of inorganic substances in water and fluvial 

sediments: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chap. A1, 545 p.

Guy, H.P., 1969, Laboratory theory and methods for sediment 

analysis: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chap. C1, 58 p.

Microsoft Bing Maps, 2010, Bing Maps aerial imagery: Redmond, Wash., Microsoft Corporation.

Radtke, D.B., 2005, Bottom-material samples (ver. 1.1): 

U.S. Geological Survey Techniques of Water-Resources 

Investigations, book 9, chap. A8, accessed February 15, 

2010, at http://pubs.water.usgs.gov/twri9A8/.

Shaffer, G.P., Day, J.W., Jr., Mack, S., Kemp, G.P., van 

Heerden, I., Poirrier, M.A., Westphal, K.A., FitzGerald, D., 

Milanes, A., Morris, C.A., Bea, R., and Penland, P., 2009, 

The MRGO navigation project—A massive human-induced 

environmental, economic, and storm disaster: Journal of 

Coastal Research Special Issue 54, Geologic and environmental dynamics of the Pontchartrain Basin, p. 206–224. 

Simpson, M.R., and Oltmann, R.N., 1993, Dischargemeasurement system using an Acoustic Doppler Current 

Profiler with applications to large rivers and estuaries: U.S. 

Geological Survey Water-Supply Paper 2395, 32 p.

U.S. Army Corps of Engineers, 2010, MRGO—Mississippi 

River Gulf Outlet—Ecosystem restoration plan feasibility 

study—History of MRGO: U.S. Army Corps of Engineers 

New Orleans District, accessed October 1, 2010, at 

http://www.mrgo.gov/MRGO_History.aspx.

Wagner, R.J., Boulger, R.W., Jr., Oblinger, C.J., and Smith, 

B.A., 2006, Guidelines and standard procedures for continuous water-quality meters—Station operation, record 

computation, and data reporting: U.S. Geological Survey 

Techniques and Methods 1–D3, 51 p., 8 attachments.

Wilde, F.D., ed., variously dated, Field Measurements: U.S. 

Geological Survey Techniques of Water-Resources Investigations, book 9, chap. A6, accessed September 22, 2010, at 

http://pubs.water.usgs.gov/twri9A/.
10 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 1. Data-collection sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, Violet Canal, and the Inner Harbor Navigation 

Canal in southeastern Louisiana, August 2008 through December 2009.

[NAD 27, North American Datum of 1927; Data-collection activity codes: T, water-quality transect; P, water-quality point; S, bed sediment; Q, discharge; 

M, continuous water-quality meter]

Station 

number Station name Latitude(NAD 27)

Longitude 

(NAD 27)

Data-collection 

activity code

294047089232700 MRGO near mile 20 near Hopedale, La. 294047 892327 T

294414089282400 MRGO near mile 27 near Hopedale, La. 294414 892824 T

294608089310500 MRGO near mile 30 near Hopedale, La. 294608 893105 T,S,Q

294805089335200 MRGO near mile 34 near Hopedale, La. 294805 893352 T,S,Q

294900089350800 MRGO near mile 35 near Hopedale, La. 294900 893508 M,S

294946089361900 MRGO near mile 37 near Hopedale, La. 294946 893619 T,S,Q

295157089423200 MRGO near mile 44 near Yscloskey, La. 295157 894232 T,S,Q

295311089445100 MRGO near mile 46 near Yscloskey, La. 295311 894451 M

295556089494400 MRGO near mile 52 near Violet, La. 295556 894944 T,S,Q

295709089511200 MRGO near mile 54 near Violet, La. 295709 895112 T,S,Q

300018089551200 MRGO near mile 59 near Michoud, La. 300108 895512 T,M,S,Q

295655089495600 Lake Borgne near MRGO near Violet, La. 295655 894956 P,M,S

295634089502000 Lake Borgne at MRGO near Violet, La. 295634 895020 Q

295602089501600 Violet Canal near MRGO near Violet, La. 295602 895016 P,S

0738023321 Industrial Canal1

 at I-10 at New Orleans, La. 300016 900132 M

1

Referred to in report as the Inner Harbor Navigation Canal. 

Table 1
Table 2 11

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 29404089232700 MRGO near mile 20 near Hopedale, La.

6/17/2009 110 31 24.3 51,700 34.0 1.8 26 7.7

6/17/2009 110 30 24.3 51,700 34.0 1.8 26 7.8

6/17/2009 110 20 24.3 51,500 33.9 1.8 26 7.8

6/17/2009 110 10 24.4 51,300 33.7 1.5 21 7.7

6/17/2009 110 5 25.2 48,500 31.7 1.6 23 7.7

6/17/2009 110 1 28.2 33,700 21.0 8.4 122 8.2

6/17/2009 220 20 -- 51,600 34.0 1.8 26 7.8

6/17/2009 220 10 24.4 51,400 33.8 1.5 22 7.8

6/17/2009 220 5 25.4 46,700 30.2 2.4 35 7.8

6/17/2009 220 1 29.7 33,500 20.9 7.9 116 8.2

10/8/2009 144 11 27.3 35,200 22.0 2.8 42 7.3

10/8/2009 144 1 28.5 31,700 19.7 6.6 95 7.5

10/8/2009 240 30 27.6 38,100 24.2 .7 10 7.6

10/8/2009 240 20 27.5 38,000 24.0 .4 5 7.6

10/8/2009 240 15 27.4 37,400 23.6 .7 9 7.6

10/8/2009 240 10 27.0 34,100 21.5 3.3 47 7.6

10/8/2009 240 1 28.1 32,200 20.0 5.4 78 7.7

10/8/2009 365 25 27.5 38,000 24.0 .4 6 7.7

10/8/2009 365 20 27.5 37,900 24.0 .3 4 7.7

10/8/2009 365 15 27.3 36,700 23.2 .5 7 7.7

10/8/2009 365 10 27.0 33,800 21.2 3.5 51 7.7

10/8/2009 365 1 28.1 32,400 20.1 5.7 82 7.8

Station number 294414089282400—MRGO near Mile 27 near Hopedale, La.

6/17/2009 300 37 24.4 50,800 33.3 0.8 11 7.5

6/17/2009 300 30 24.4 50,800 33.3 .8 13 7.5

6/17/2009 300 20 24.4 50,800 33.3 .8 12 7.5

6/17/2009 300 10 24.6 50,500 33.1 .6 9 7.6

6/17/2009 300 5 25.4 47,700 30.6 1.1 16 7.6

6/17/2009 300 1 28.5 41,400 26.1 8.9 131 8.1

7/30/2009 100 14 27.5 45,900 29.7 2.6 40 --

7/30/2009 100 10 29.3 42,100 27.0 3.0 45 --

7/30/2009 100 1 29.8 41,700 26.7 7.1 110 --

7/30/2009 200 35 25.9 49,200 32.2 2.6 32 --

7/30/2009 200 30 26.2 48,700 31.8 1.4 21 --

7/30/2009 200 20 26.9 48,000 31.3 .2 3 --

7/30/2009 200 10 29.5 42,100 27.0 3.7 57 --

7/30/2009 200 1 30.2 41,300 26.4 7.4 114 --

7/30/2009 300 37 25.9 49,200 32.2 .9 14 --

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Table 2
12 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294414089282400—MRGO near Mile 27 near Hopedale, La.—Continued

7/30/2009 300 30 26.6 48,800 31.8 0.1 2 --

7/30/2009 300 20 26.6 48,900 31.9 .1 2 --

7/30/2009 300 10 29.9 42,000 26.9 4.7 72 --

7/30/2009 300 1 30.2 41,200 26.4 6.9 107 --

7/30/2009 400 25 26.8 48,300 31.5 2.8 31 --

7/30/2009 400 20 27.0 47,500 30.9 .3 4 --

7/30/2009 400 10 29.6 41,800 26.8 4.6 83 --

7/30/2009 400 1 30.2 41,100 26.3 7.4 114 --

7/30/2009 500 9 29.6 41,800 26.3 7.0 108 --

7/30/2009 500 1 30.3 41,100 26.8 7.6 117 --

9/2/2009 100 10 28.2 37,600 23.8 7.0 -- 8.1

9/2/2009 100 1 28.3 37,500 23.7 10.1 147 8.2

9/2/2009 200 29 28.3 40,000 25.5 .5 7 7.8

9/2/2009 200 20 28.3 38,500 24.4 5.5 81 7.9

9/2/2009 200 10 28.4 37,800 23.9 7.9 116 8.0

9/2/2009 200 1 28.4 37,300 23.5 10.6 154 8.2

9/2/2009 300 40 27.8 44,700 28.8 .5 7 7.7

9/2/2009 300 30 28.1 39,400 25.0 2.8 41 7.7

9/2/2009 300 20 28.1 38,500 24.4 5.7 83 8.0

9/2/2009 300 10 28.6 37,800 23.9 9.2 136 8.1

9/2/2009 300 1 28.6 37,000 23.3 12.5 183 8.3

9/2/2009 400 27 28.2 39,000 24.8 3.2 48 7.9

9/2/2009 400 20 28.3 38,700 24.4 5.7 84 8.2

9/2/2009 400 10 28.7 37,700 23.8 8.0 118 8.2

9/2/2009 400 1 28.5 36,800 23.2 10.3 152 8.2

9/2/2009 500 9 28.4 37,600 23.8 8.0 118 8.2

9/2/2009 500 1 28.4 36,700 23.1 10.4 157 8.3

10/8/2009 100 1 29.2 32,400 20.1 6.9 101 7.9

10/8/2009 100 5 29.2 32,400 20.1 6. 8 99 7.9

10/8/2009 200 1 29.2 32,500 20.2 6.7 99 7.9

10/8/2009 200 9 29.1 32,300 20.2 6.4 93 7.9

10/8/2009 300 38 27.9 40,500 25.8 .4 5 7.7

10/8/2009 300 30 27.4 38,900 23.9 .4 5 7.7

10/8/2009 300 25 27.0 35,400 22.2 2.2 30 7.7

10/8/2009 300 20 26.8 33,900 21.3 3.0 42 7.7

10/8/2009 300 10 28.5 32,300 20.1 6.4 92 7.6

10/8/2009 300 1 28.9 32,400 20.1 6.8 98 7.8

10/8/2009 405 37 27.9 40,700 20.9 .5 7 7.7

10/8/2009 405 30 27.8 38,900 24.6 .4 4 7.7

10/8/2009 405 25 26.9 35,000 23.0 2.1 29 7.7
Table 2 13

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294414089282400—MRGO near Mile 27 near Hopedale, La.—Continued

10/8/2009 405 20 26.7 33,600 21.0 3.4 48 7.7

10/8/2009 405 10 28.3 32,300 20.0 6.2 90 7.7

10/8/2009 405 1 28.7 32,400 20.1 6.1 89 7.8

10/8/2009 500 15 27.7 32,400 20.2 5.1 72 7.8

10/8/2009 500 10 28.1 32,400 20.1 6.0 86 7.8

10/8/2009 500 1 28.2 32,300 20.1 6.3 91 7.8

Station number 294608089310500—MRGO near mile 30 near Hopedale, La.

8/15/2008 90 5 27.8 30,600 19.0 6.0 84 7.8

8/15/2008 90 1 28.0 30,600 19.0 6.2 89 7.9

8/15/2008 180 34 24.9 43,100 27.7 4.9 69 7.7

8/15/2008 180 30 24.9 42,800 27.5 5.0 70 7.7

8/15/2008 180 25 25.4 40,600 26.2 4.7 67 7.8

8/15/2008 180 18 27.5 31,200 19.3 5.8 82 7.8

8/15/2008 180 15 27.6 31,000 19.2 5.9 83 7.8

8/15/2008 180 10 27.7 30,800 19.1 6.0 85 7.9

8/15/2008 180 5 27.8 30,800 19.0 6.1 86 7.9

8/15/2008 180 1 27.9 30,700 19.0 6.3 89 7.9

8/15/2008 290 41 24.7 43,600 28.1 5.0 71 7.7

8/15/2008 290 30 25.0 42,200 27.1 5.1 72 7.8

8/15/2008 290 20 26.9 33,200 20.9 5.5 77 7.8

8/15/2008 290 15 27.6 30,900 19.1 6.1 86 7.9

8/15/2008 290 10 27.9 30,700 19.0 6.4 92 7.9

8/15/2008 290 1 28.1 30,600 18.9 6.8 97 7.9

8/15/2008 400 17 27.6 30,800 19.0 6.4 90 7.9

8/15/2008 400 10 27.6 30,800 19.0 6.4 90 7.9

8/15/2008 400 1 27.7 30,600 18.9 6.3 90 7.9

8/15/2008 485 8 27.6 30,700 19.0 6.1 87 7.9

8/15/2008 485 1 27.7 30,600 18.9 6.4 92 7.9

9/26/2008 90 12 25.7 25,100 15.2 5.7 77 --

9/26/2008 90 1 27.1 23,000 13.9 6.5 94 --

9/26/2008 180 35 25.3 32,100 20.0 6.6 91 --

9/26/2008 180 25 25.4 30,700 19.0 6.3 86 --

9/26/2008 180 15 25.7 25,300 15.4 6.6 89 --

9/26/2008 180 5 26.3 23,500 14.2 7.8 105 --

9/26/2008 180 1 27.1 23,000 13.9 7.8 106 --

9/26/2008 290 42 25.3 30,700 19.0 6.5 86 --

9/26/2008 290 30 25.3 31,000 19.3 6.4 87 --
14 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294608089310500—MRGO near mile 30 near Hopedale, La.—Continued

9/26/2008 290 25 25.4 30,700 19.0 6.4 87 --

9/26/2008 290 20 25.5 27,900 17.1 6.5 87 --

9/26/2008 290 15 25.6 26,700 16.3 6.6 88 --

9/26/2008 290 10 25.9 24,100 14.6 7.0 93 --

9/26/2008 290 5 26.0 23,800 14.4 7.2 97 --

9/26/2008 290 1 26.8 22,900 13.8 7.5 102 --

9/26/2008 400 17 25.8 26,100 15.9 6.6 87 --

9/26/2008 400 10 25.7 24,300 14.7 6.3 84 --

9/26/2008 400 1 26.8 21,900 13.1 7.6 103 --

9/26/2008 485 6 27.9 23,200 12.7 7.3 95 --

9/26/2008 485 1 27.0 21,300 14.0 8.1 109 --

11/24/2008 90 5 14.2 19,800 11.7 9.8 102 8.1

11/24/2008 90 1 14.2 19,710 11.7 9.9 103 8.0

11/24/2008 180 13 14.1 25,400 15.5 8.6 91 7.9

11/24/2008 180 10 14.1 22,100 13.2 8.7 91 7.9

11/24/2008 180 1 14.1 19,900 11.7 9.5 97 8.0

11/24/2008 290 37 13.6 38,100 24.1 8.7 97 7.8

11/24/2008 290 30 13.6 38,100 24.2 8.7 97 7.8

11/24/2008 290 20 13.9 37,300 23.6 8.5 96 7.9

11/24/2008 290 10 14.0 20,600 12.3 8. 5 88 8.0

11/24/2008 290 1 14.1 19,700 11.7 9.3 96 8.0

11/24/2008 400 17 14.4 31,200 19.3 8.3 91 7.8

11/24/2008 400 10 14.0 21,900 13.1 8.7 92 8.0

11/24/2008 400 1 14.1 19,700 11.7 9.5 99 8.0

11/24/2008 485 3 14.2 20,000 11.9 9.8 102 8.0

11/24/2008 485 1 14.3 19,900 11.8 9.9 103 8.0

3/11/2009 90 6 20.7 25,300 15.5 8.9 108 7.9

3/11/2009 90 1 20.8 25,000 15.3 9.3 114 8.0

3/11/2009 180 14 20.1 25,700 15.8 9.6 116 8.0

3/11/2009 180 10 20.4 25,300 15.5 9.5 115 8.0

3/11/2009 180 1 20.7 24,900 15.2 9.6 116 8.0

3/11/2009 290 40 14.8 39,300 25.0 8.3 97 7.8

3/11/2009 290 30 14.7 39,200 25.0 7.7 88 7.9

3/11/2009 290 20 17.6 28,500 17.6 8.6 99 7.9

3/11/2009 290 10 20.2 25,400 15.5 9.4 114 8.0

3/11/2009 290 1 20.6 24,800 15.1 9.6 117 8.0

3/11/2009 400 40 14.8 39,300 25.1 8.1 93 7.9

3/11/2009 400 30 14.7 39,300 25.1 7.9 91 7.9

3/11/2009 400 20 17.2 28,700 17.6 8.5 98 7.9

3/11/2009 400 10 20.1 25,300 15.4 9.2 110 8.0
Table 2 15

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294608089310500—MRGO near mile 30 near Hopedale, La.—Continued

3/11/2009 400 1 20.6 24,700 15.1 9.6 116 8.0

3/11/2009 485 15 19.7 25,700 15.7 9.7 117 8.0

3/11/2009 485 10 19.8 25,500 15.6 9.6 116 8.0

3/11/2009 485 1 20.3 25,100 15.3 9.6 117 8.0

6/10/2009 90 6 27.1 26,400 15.8 3.0 41 7.7

6/10/2009 90 1 30.9 19,600 11.6 8.3 119 8.0

6/10/2009 180 30 25.7 32,600 20.4 .9 12 7.5

6/10/2009 180 20 25.8 32,500 20.2 .8 10 7.5

6/10/2009 180 10 26.4 28,500 17.5 1.3 17 7.5

6/10/2009 180 1 31.0 19,500 11.5 8.1 117 8.1

6/10/2009 290 39 25.7 32,600 20.4 1.0 14 7.5

6/10/2009 290 30 25.7 32,600 20.4 .9 12 7.5

6/10/2009 290 20 25.8 32,500 20.3 .9 12 7.5

6/10/2009 290 10 26.4 28,400 17.5 1.5 20 7.5

6/10/2009 290 1 31.1 18,500 11.5 8.4 120 8.1

6/10/2009 400 19 25.3 32,500 20.2 .6 9 7.5

6/10/2009 400 10 26.4 28,300 17.4 1.2 17 7.6

6/10/2009 400 1 31.1 19,400 11.5 8.2 118 8.1

6/10/2009 485 4 29.3 22,700 13.6 3.2 45 7.7

6/10/2009 485 1 31.1 20,300 12.1 8.2 118 8.1

7/30/2009 90 5 7.2 41,200 26.3 7.2 111 --

7/30/2009 90 1 30.2 41,100 26.3 7.3 113 --

7/30/2009 180 30 25.9 49,200 32.1 .3 5 --

7/30/2009 180 20 27.0 47,800 31.1 .1 2 --

7/30/2009 180 10 29.8 41,300 26.4 3.2 51 --

7/30/2009 180 1 30.1 41,100 26.3 6.5 100 --

7/30/2009 290 35 25.9 49,300 32.2 .5 6 --

7/30/2009 290 30 26.3 48,300 31.5 .1 2 --

7/30/2009 290 20 26.9 46,400 30.1 .1 1 --

7/30/2009 290 10 29.7 41,200 26.4 3.8 58 --

7/30/2009 290 1 30.1 41,100 26.3 7.3 113 --

7/30/2009 400 8.5 30.0 41,200 26.3 7.7 118 --

7/30/2009 400 1 30.1 41,100 26.3 7.8 121 --

7/30/2009 485 4 30.0 41,000 26.3 8.0 123 --

7/30/2009 485 1 30.1 41,000 26.3 8.1 124 --

9/2/2009 90 5 28.3 37,200 23.5 6.1 90 8.0

9/2/2009 90 1 28.5 36,900 23.3 6.4 95 8.0

9/2/2009 180 15 28.4 38,500 14.4 5.2 76 7.9

9/2/2009 180 10 28.4 38,000 24.1 5.5 81 8.0

9/2/2009 180 1 28.7 36,700 23.1 9.2 136 8.0
16 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294608089310500—MRGO near mile 30 near Hopedale, La.—Continued

9/2/2009 290 40 27.6 46,200 29.9 0.4 6 7.7

9/2/2009 290 30 28.1 40,200 25.6 .3 4 7.7

9/2/2009 290 20 28.1 38,700 24.5 2.5 37 7.7

9/2/2009 290 10 28.3 37,900 23.9 5.8 86 7.8

9/2/2009 290 1 28.8 36,400 22.9 10.0 147 8.0

9/2/2009 400 28 28.7 40,000 25.4 .4 6 7.8

9/2/2009 400 25 28.6 39,900 25.4 .2 3 7.7

9/2/2009 400 20 28.4 39,100 24.8 2.0 30 7.7

9/2/2009 400 10 28.4 38,000 24.0 5.0 73 7.8

9/2/2009 400 1 28.6 36,000 22.6 9.8 145 8.1

9/2/2009 485 5 28.7 36,000 22.6 8.4 122 8.1

9/2/2009 485 1 28.9 35,700 22.4 9.0 132 8.1

10/8/2009 90 1 30.1 31,100 19.2 6.3 94 7.8

10/8/2009 90 5 28.7 31,500 19.6 5.9 86 7.8

10/8/2009 180 10 28.8 31,600 19.6 6.1 89 7.8

10/8/2009 180 1 29.7 31,400 19.4 6.0 88 7.7

10/8/2009 290 30 27.8 39,600 25.0 .7 11 7.6

10/8/2009 290 20 26.8 32,600 20.3 3.7 52 7.7

10/8/2009 290 10 29.5 31,600 19.6 5.9 85 7.7

10/8/2009 290 1 28.9 31,600 19.6 5.8 84 7.7

10/8/2009 290 36 28.0 41,600 26.6 .5 8 7.6

10/8/2009 400 30 27.9 38,000 24.1 .4 6 7.7

10/8/2009 400 26 26.9 35,200 22.0 1.2 28 7.7

10/8/2009 400 20 26.8 32,600 20.3 3.7 52 7.7

10/8/2009 400 10 28.7 31,600 19.6 5.6 81 7.7

10/8/2009 400 1 28.8 31,600 19.6 6.1 88 7.7

10/8/2009 485 5 28.5 31,700 19.7 6.5 94 7.7

10/8/2009 486 1 29.1 31,800 19.7 7.1 103 7.8

11/6/2009 90 6 19.6 28,900 17.9 7.6 92 8.2

11/6/2009 90 1 19.6 28,900 17.9 7.6 92 8.2

11/6/2009 180 10 19.3 28,800 17.8 7.4 89 8.1

11/6/2009 180 1 19.6 28,800 17.8 7.7 93 8.1

11/6/2009 290 40 19.7 35,500 22.5 .9 12 8.0

11/6/2009 290 35 19.7 35,600 22.5 3.7 46 8.0

11/6/2009 290 30 19.7 35,300 22.3 3.8 47 8.0

11/6/2009 290 25 20.1 34,700 21.8 4.8 60 8.0

11/6/2009 290 20 19.3 28,900 17.9 4.9 59 8.1

11/6/2009 290 10 19.4 28,800 17.8 6.9 84 8.0

11/6/2009 290 1 19.6 28,500 17.6 7.9 95 8.1

11/6/2009 400 23 20.2 28,200 17.4 7.4 91 8.0
Table 2 17

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294608089310500—MRGO near mile 30 near Hopedale, La.—Continued

11/6/2009 400 20 19.6 27,500 16.9 4.8 58 8.0

11/6/2009 400 10 19.5 28,600 17.7 7.4 89 8.0

11/6/2009 400 1 19.7 28,600 17.7 8.0 97 8.1

11/6/2009 485 4 20.0 28,700 17.7 7.9 97 8.1

11/6/2009 486 1 20.0 28,700 17.7 8.0 98 8.1

Station number 294805089335200—MRGO near mile 34 near Hopedale, La.

8/15/2008 120 5 27.9 31,000 19.2 6.4 91 7.8

8/15/2008 120 1 28.7 30,400 18.8 6.6 94 7.8

8/15/2008 190 6 27.8 30,900 19.1 6.2 88 7.8

8/15/2008 190 1 28.5 30,500 18.8 6.6 94 7.8

8/15/2008 340 39 25.1 42,100 27.0 4.6 65 7.7

8/15/2008 340 30 25.2 41,500 26.7 4.7 66 7.7

8/15/2008 340 25 26.0 38,100 24.1 5.0 71 7.8

8/15/2008 340 20 27.3 31,700 19.7 5.8 82 7.8

8/15/2008 340 10 27.6 30,900 19.1 6.2 88 7.9

8/15/2008 340 1 28.0 30,700 19.0 7.0 100 7.9

8/15/2008 445 38 25.1 42,100 27.0 4.5 63 7.7

8/15/2008 445 30 25.2 41,800 26.8 4.5 64 7.7

8/15/2008 445 25 26.0 37,700 23.9 5.0 71 7.8

8/15/2008 445 20 27.3 31,600 19.5 5.8 82 7.8

8/15/2008 445 10 27.5 31,000 19.2 6.0 85 7.9

8/15/2008 445 1 28.0 30,800 19.0 6.7 96 7.9

8/15/2008 570 5 27.7 31,100 19.3 6.0 84 7.8

8/15/2008 570 1 28.4 31,000 19.2 6.5 93 7.9

9/26/2008 120 8 26.1 21,700 12.5 6.8 88 --

9/26/2008 120 1 26.8 20,900 13.0 7.3 102 --

9/26/2008 190 31 25.4 29,500 18.2 6.3 86 --

9/26/2008 190 15 25.9 24,600 14.9 6.2 83 --

9/26/2008 190 1 26.8 20,900 12.5 7.8 106 --

9/26/2008 340 41 25.4 29,600 18.3 6.4 87 --

9/26/2008 340 30 25.5 29,800 18.4 -- -- --

9/26/2008 340 25 25.5 29,100 17.9 6.4 86 --

9/26/2008 340 15 25.9 23,400 14.1 6.6 26 --

9/26/2008 340 1 26.7 20,600 12.2 7.7 106 --

9/26/2008 445 37 25.5 20,800 19.1 6.6 87 --

9/26/2008 445 30 25.5 29,800 18.4 6.3 86 --

9/26/2008 445 15 26.0 22,800 13.7 6.3 85 --

9/26/2008 445 1 26.6 20,300 12.1 8.4 113 --

9/26/2008 570 7 26.4 20,200 12.0 8.1 108 --

9/26/2008 570 1 26.5 19,800 11.7 8.2 111 --

11/24/2008 120 5 14.2 19,200 11.4 9.8 101 8.0
18 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294805089335200—MRGO near mile 34 near Hopedale, La.—Continued

11/24/2008 120 1 14.2 19,200 11.4 9.8 102 8.0

11/24/2008 190 9 14.0 19,300 11.3 9.6 100 7.9

11/24/2008 190 1 14.0 19,100 11.4 9.7 100 7.9

11/24/2008 340 38 14.9 34,900 22.0 7.7 86 7.7

11/24/2008 340 30 14.9 34,900 21.9 7.5 84 7.8

11/24/2008 340 20 14.6 28,600 17.6 7.6 84 7.9

11/24/2008 340 10 13.9 19,600 11.6 8.6 89 7.9

11/24/2008 340 1 14.0 19,100 11.3 9.3 97 8.0

11/24/2008 445 33 14.9 35,200 22.1 7.7 87 7.8

11/24/2008 445 30 14.9 35,200 22.1 7.3 83 7.8

11/24/2008 445 20 14.5 28,000 17.2 7.7 83 7.9

11/24/2008 445 10 13.8 19,300 11.5 8.6 88 8.0

11/24/2008 445 1 14.0 19,100 11.3 9.3 96 8.0

11/24/2008 570 4 14.3 19,300 11.4 10.0 104 8.0

11/24/2008 570 1 14.3 19,300 11.4 10.0 104 8.0

1/23/2009 120 3 11.7 22,000 13.2 11.3 114 7.9

1/23/2009 120 1 11.8 22,000 13.2 11.2 113 8.0

1/23/2009 190 10 10.5 23,200 14.1 10.8 106 7.9

1/23/2009 190 1 11.2 21,800 13.1 11.1 110 8.0

1/23/2009 340 39 10.5 25,100 15.3 10.5 104 8.0

1/23/2009 340 30 10.5 25,000 15.2 10.5 104 8.0

1/23/2009 340 20 10.5 24,600 14.9 10.5 103 8.0

1/23/2009 340 10 10.5 22,800 13.8 10.6 104 8.0

1/23/2009 340 1 11.1 21,800 13.1 10.9 108 8.0

1/23/2009 445 33 10.5 25,000 15.2 10.6 105 8.0

1/23/2009 445 30 10.5 25,000 15.2 10.5 104 8.0

1/23/2009 445 10 10.8 22,600 13.6 11.0 107 8.0

1/23/2009 445 1 11.2 21,900 13.2 10.9 108 8.0

1/23/2009 570 6 11.1 22,100 13.3 10.8 107 8.0

1/23/2009 570 1 11.1 22,000 13.3 11.1 109 8.0

3/11/2009 120 1 21.3 23,800 14.4 9.1 112 7.9

3/11/2009 190 6 20.9 24,000 14.6 9.1 111 7.9

3/11/2009 190 1 21.1 23,900 14.4 9.2 114 7.9

3/11/2009 340 37 14.8 38,300 24.4 8.5 99 7.9

3/11/2009 340 30 14.8 37,800 23.9 8.0 92 7.8

3/11/2009 340 20 18.2 27,200 16.7 8.4 96 7.9

3/11/2009 340 10 20.0 24,300 14.8 8.8 106 7.9

3/11/2009 340 1 20.5 23,500 14.2 9.1 110 7.9

3/11/2009 445 37 14.8 38,300 24.3 7.9 91 7.8

3/11/2009 445 30 15.1 37,500 24.0 7.5 87 7.8
Table 2 19

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294805089335200—MRGO near mile 34 near Hopedale, La.—Continued

3/11/2009 445 20 18.2 27,600 17.0 8.1 97 7.9

3/11/2009 445 10 20.0 23,900 14.6 8.8 105 7.9

3/11/2009 445 1 20.7 23,200 14.1 9.8 110 7.9

3/11/2009 570 6 20.6 23,900 14.5 9.5 114 7.9

3/11/2009 570 1 20.6 23,900 14.5 9.4 114 7.9

6/10/2009 120 4 27.2 26,300 16.1 2.0 25 7.5

6/10/2009 120 1 30.1 17,600 10.3 7.4 106 7.8

6/10/2009 190 36 25.9 29,500 18.1 .5 9 7.5

6/10/2009 190 30 26.1 29,400 18.1 .6 8 7.4

6/10/2009 190 20 26.2 29,200 18.0 .5 7 7.4

6/10/2009 190 10 26.4 28,500 17.5 .6 8 7.4

6/10/2009 190 5 26.7 26,500 16.2 1.6 20 7.6

6/10/2009 190 1 30.6 18,700 11.1 8.4 121 8.0

6/10/2009 340 29 26.1 29,300 18.1 .5 7 7.5

6/10/2009 340 20 26.2 29,100 18.0 .5 6 7.5

6/10/2009 340 10 26.4 28,500 17.5 .6 8 7.5

6/10/2009 340 5 26.7 26,700 16.4 1.2 17 7.5

6/10/2009 340 1 30.9 19,300 11.3 8.7 125 8.2

6/10/2009 445 6 26.8 27,400 16.8 1.3 17 7.7

6/10/2009 445 1 31.1 19,400 11.4 8.4 121 8.1

6/10/2009 570 4 27.6 25,700 15.6 1.3 18 7.6

6/10/2009 570 1 31.1 19,400 11.5 7.7 111 8.0

7/30/2009 120 26 25.8 47,700 31.0 .2 3 --

7/30/2009 120 20 26.8 47,600 31.0 .1 2 --

7/30/2009 120 10 30.2 41,300 26.5 5.3 82 --

7/30/2009 120 1 30.7 40,200 25.7 6.6 106 --

7/30/2009 190 36 26.0 47,900 31.2 1.9 24 --

7/30/2009 190 30 26.5 48,600 31.7 .5 9 --

7/30/2009 190 20 26.9 47,200 30.7 .2 3 --

7/30/2009 190 10 30.5 40,600 25.9 2.7 42 --

7/30/2009 190 1 30.7 40,100 25.6 6.0 93 --

7/30/2009 340 36 25.8 49,900 32.7 .9 10 --

7/30/2009 340 30 26.5 48,000 31.3 .4 7 --

7/30/2009 340 20 26.9 47,000 30.8 .2 2 --

7/30/2009 340 10 30.8 44,400 28.7 3.6 58 --

7/30/2009 340 1 30.6 39,400 25.1 7.4 115 --

7/30/2009 445 6 30.7 39,400 25.1 7.7 119 --

7/30/2009 445 1 30.9 39,500 25.1 7.8 120 --

7/30/2009 570 4 30.6 38,900 24.7 7.4 114 --

7/30/2009 570 1 30.7 38,600 24.5 7.4 114 --
20 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294805089335200—MRGO near mile 34 near Hopedale, La.—Continued

9/2/2009 120 3 28.9 38,700 24.5 1.3 20 7.8

9/2/2009 120 1 29.6 38,900 24.3 3.0 25 7.7

9/2/2009 190 7 29.0 39,000 24.7 .9 13 7.7

9/2/2009 190 3 29.4 38,000 24.0 4.0 59 7.7

9/2/2009 190 1 29.5 38,000 24.0 4.3 65 7.7

9/2/2009 340 34 27.9 46,500 29.9 .3 5 7.5

9/2/2009 340 30 29.0 41,100 26.2 .2 3 7.5

9/2/2009 340 20 29.1 40,000 25.4 .2 3 7.5

9/2/2009 340 10 29.0 39,100 24.8 .4 5 7.5

9/2/2009 340 5 29.0 38,200 24.2 3.3 48 7.6

9/2/2009 340 1 29.4 37,700 23.8 5.8 86 7.7

9/2/2009 445 35 27.6 46,700 30.2 .2 3 7.5

9/2/2009 445 30 28.7 41,300 26.3 .2 2 7.5

9/2/2009 445 20 29.0 39,900 25.3 .1 2 7.5

9/2/2009 445 10 29.0 39,400 25.0 .2 3 7.5

9/2/2009 445 5 29.0 37,700 23.8 4.5 67 7.7

9/2/2009 445 1 29.3 37,600 23.7 6.2 93 7.7

9/2/2009 570 5 29.2 38,400 24.3 3.9 58 7.6

9/2/2009 570 1 29.6 36,700 23.1 5.9 88 7.7

10/8/2009 120 3.5 29.5 28,200 17.3 5.7 83 7.8

10/8/2009 120 1 29.5 28,300 17.4 5.9 85 7.7

10/8/2009 190 5 29.4 28,100 17.2 5.4 77 7.7

10/8/2009 190 1 29.4 28,100 17.2 5.4 78 7.6

10/8/2009 340 28 27.1 25,800 22.5 1.3 20 7.5

10/8/2009 340 25 26.9 34,400 21.5 2.6 37 7.5

10/8/2009 340 20 27.3 32,000 19.9 3.7 52 7.6

10/8/2009 340 10 29.0 28,500 17.5 5.1 73 7.6

10/8/2009 340 1 29.2 28,300 17.3 5.2 75 7.6

10/8/2009 445 35 28.1 41,900 27.0 .6 8 7.4

10/8/2009 445 30 27.7 37,700 23.8 .3 4 7.5

10/8/2009 445 25 26.9 33,700 21.1 2.8 39 7.6

10/8/2009 445 20 27.7 32,200 20.1 3.7 52 7.6

10/8/2009 445 10 28.8 28,800 17.6 6.1 88 7.6

10/8/2009 445 1 29.0 28,400 17.4 5.2 74 7.6

10/8/2009 570 28 27.3 36,300 22.8 .5 8 7.5

10/8/2009 570 20 27.3 31,800 19.7 3.8 53 7.6

10/8/2009 570 10 28.9 28,800 17.7 6.4 92 7.6

10/8/2009 570 1 29.2 28,500 17.5 5.9 85 7.6

11/6/2009 120 4 19.6 27,600 17.0 7.8 94 9.6

11/6/2009 120 1 19.7 27,600 17.0 7.8 95 9.1
Table 2 21

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294805089335200—MRGO near mile 34 near Hopedale, La.—Continued

11/6/2009 190 6 19.6 27,600 17.0 8.2 99 8.7

11/6/2009 190 1 19.6 27,300 16.8 8.2 98 8.7

11/6/2009 340 35 19.9 34,900 22.0 4.7 59 8.3

11/6/2009 340 30 19.8 34,900 22.0 4.7 59 8.3

11/6/2009 340 20 19.6 29,200 18.1 5.0 61 8.4

11/6/2009 340 10 19.3 27,600 17.0 7.0 84 8.4

11/6/2009 340 1 19.4 26,500 16.3 7.6 90 8.3

11/6/2009 445 30 19.9 31,300 19.5 4.0 49 8.1

11/6/2009 445 20 19.6 29,200 18.1 5.6 69 8.2

11/6/2009 445 10 19.3 27,700 17.1 7.0 84 8.2

11/6/2009 445 1 19.5 26,600 16.3 7.7 93 8.2

11/6/2009 570 5 19.7 26,300 16.1 8.1 97 8.2

11/6/2009 570 1 19.7 26,400 16.2 8.2 98 8.2

Station number 294946089361900—MRGO near Mile 37 near Hopedale, La.

8/15/2008 80 41 26.1 37,800 23.9 4.9 69 7.7

8/15/2008 80 30 26.2 37,600 23.8 4.9 69 7.7

8/15/2008 80 25 26.2 37,000 23.3 5.0 70 7.8

8/15/2008 80 20 26.7 34,900 22.1 5.3 75 7.8

8/15/2008 80 10 27.5 31,300 19.4 6.0 85 7.8

8/15/2008 80 1 27.8 31,300 19.4 6.4 91 7.8

8/15/2008 150 42 26.0 38,500 24.5 4.7 67 7.7

8/15/2008 150 30 26.0 38,400 24.4 4.8 67 7.7

8/15/2008 150 25 26.2 37,200 23.5 5.0 70 7.8

8/15/2008 150 20 27.0 33,200 20.7 5.6 79 7.8

8/15/2008 150 10 27.4 31,500 19.6 6.0 84 7.8

8/15/2008 150 1 28.0 31,100 19.2 6.6 95 7.9

8/15/2008 250 36 26.2 37,400 23.7 5.1 72 7.8

8/15/2008 250 30 26.2 37,300 23.6 5.1 71 7.8

8/15/2008 250 25 26.2 37,100 23.5 5.1 71 7.8

8/15/2008 250 20 27.3 32,500 20.2 5.8 83 7.8

8/15/2008 250 10 27.6 31,300 19.4 6.3 90 7.9

8/15/2008 250 1 28.0 30,900 19.1 6.9 98 7.9

9/26/2008 80 34 25.8 28,100 17.2 6.1 82 --

9/26/2008 80 15 26.2 21,500 12.8 6.8 91 --

9/26/2008 80 1 26.7 19,300 11.4 7.3 103 --

9/26/2008 150 42 25.7 28,300 17.4 6.4 87 --

9/26/2008 150 30 25.9 26,500 16.2 5.9 80 --

9/26/2008 150 15 26.1 22,200 13.3 6.0 80 --

9/26/2008 150 1 26.7 19,100 11.3 8.0 107 --
22 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294946089361900—MRGO near Mile 37 near Hopedale, La.—Continued

9/26/2008 250 30 26.2 25,800 15.7 6.3 83 --

9/26/2008 250 18 26.3 24,600 14.9 5.5 75 --

9/26/2008 250 10 26.2 21,300 12.7 6.0 81 --

9/26/2008 250 1 26.7 18,700 11.0 8.2 109 --

11/24/2008 80 37 14.9 33,700 21.1 7.2 80 7.8

11/24/2008 80 30 14.6 29,200 18.0 7.5 82 7.8

11/24/2008 80 20 14.1 21,900 13.1 7.9 83 7.9

11/24/2008 80 10 14.1 18,700 11.1 8.9 92 7.9

11/24/2008 80 1 14.2 18,900 11.2 9.5 99 7.9

11/24/2008 150 43 14.9 33,800 21.1 8.0 89 7.8

11/24/2008 150 40 14.8 33,700 21.1 7.7 85 7.8

11/24/2008 150 30 14.7 21,500 12.8 7.6 84 7.8

11/24/2008 150 20 14.2 24,200 14.6 7.8 82 7.9

11/24/2008 150 10 14.1 19,100 11.3 8.6 89 7.9

11/24/2008 150 1 14.0 18,800 11.1 9.3 96 7.9

11/24/2008 250 24 14.7 29,300 18.1 7.9 86 7.8

11/24/2008 250 20 14.5 28,600 17.6 7.8 84 7.8

11/24/2008 250 10 14.0 19,300 11.4 8.7 90 7.9

11/24/2008 250 1 14.0 18,700 11.0 9.5 99 7.9

1/23/2009 80 20 10.5 23,600 14.3 10.7 106 8.0

1/23/2009 80 10 11.4 21,500 13.0 10.9 108 8.0

1/23/2009 80 1 11.5 21,400 12.9 11.1 111 8.1

1/23/2009 150 42 10.5 25,300 15.4 10.3 101 8.0

1/23/2009 150 30 10.5 25,200 15.4 10.2 101 8.0

1/23/2009 150 20 10.6 23,600 14.3 10.4 102 8.0

1/23/2009 150 10 11.2 21,600 13.0 10.9 107 8.0

1/23/2009 150 1 11.4 21,300 12.8 11.1 110 8.1

1/23/2009 250 25 10.4 24,400 14.8 10.4 102 8.0

1/23/2009 250 20 10.4 24,100 14.5 10.3 101 8.0

1/23/2009 250 10 10.6 23,400 14.1 10.4 102 8.0

1/23/2009 250 1 11.2 22,000 13.2 10.7 106 8.0

3/11/2009 80 20 18.0 25,900 15.9 9.1 107 7.5

3/11/2009 80 10 20.1 23,200 14.1 8.5 102 7.5

3/11/2009 80 1 21.4 22,000 13.3 9.0 110 7.7

3/11/2009 150 40 14.9 37,300 23.7 7.9 90 7.5

3/11/2009 150 30 15.1 36,100 22.8 7.5 86 7.5

3/11/2009 150 20 18.8 24,700 15.1 8.5 99 7.7

3/11/2009 150 10 19.9 23,100 14.0 8.7 104 7.7

3/11/2009 150 1 21.2 22,000 13.3 9.1 111 7.8

3/11/2009 250 20 19.3 24,200 14.7 8.9 106 7.8
Table 2 23

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294946089361900—MRGO near Mile 37 near Hopedale, La.—Continued

3/11/2009 250 10 19.9 22,900 13.9 9.0 107 7.8

3/11/2009 250 1 20.9 22,100 13.3 9.4 114 7.9

6/10/2009 80 34 27.3 23,000 13.8 1.8 24 7.4

6/10/2009 80 20 28.8 17,500 10.3 4.7 65 7.5

6/10/2009 80 10 29.4 14,600 8.4 5.9 81 7.6

6/10/2009 80 1 31.5 14,700 8.5 8.3 118 7.9

6/10/2009 150 43 26.6 23,700 14.3 .6 8 7.3

6/10/2009 150 40 26.7 23,500 14.2 .8 10 7.3

6/10/2009 150 30 28.0 22,400 13.4 3.0 41 7.4

6/10/2009 150 20 29.1 17,700 10.4 5.0 70 7.5

6/10/2009 150 10 29.2 14,600 8.4 5.8 79 7.6

6/10/2009 150 1 31.9 14,600 8.4 8.5 120 7.9

6/10/2009 250 36 27.4 23,100 13.9 2.4 82 7.3

6/10/2009 250 30 27.8 22,800 13.8 2.8 38 7.3

6/10/2009 250 20 29.0 18,000 10.6 5.0 70 7.4

6/10/2009 250 10 29.0 14,700 8.5 5.6 76 7.5

6/10/2009 250 1 31.4 14,700 8.5 8.3 118 7.8

7/30/2009 80 10 30.7 15,800 9.2 8.2 116 --

7/30/2009 80 1 31.0 15,600 9.0 9.0 128 --

7/30/2009 150 41 28.2 39,000 24.8 1.4 21 --

7/30/2009 150 40 28.5 37,900 24.1 .2 3 --

7/30/2009 150 30 30.0 21,500 12.8 4.2 62 --

7/30/2009 150 20 30.0 27,000 16.5 5.5 76 --

7/30/2009 150 10 30.8 15,800 9.2 8.6 122 --

7/30/2009 150 1 30.9 14,700 8.5 9.2 130 --

7/30/2009 250 15 30.2 17,100 10.0 5.9 81 --

7/30/2009 250 10 30.6 16,000 9.3 6.5 92 --

7/30/2009 250 1 30.9 16,000 9.3 7.9 113 --

9/2/2009 80 39 29.0 32,200 20.0 .4 6 7.6

9/2/2009 80 30 29.0 24,900 15.1 3.8 53 7.6

9/2/2009 80 20 29.1 18,900 11.1 3.7 51 7.7

9/2/2009 80 10 28.8 17,000 9.9 7.8 107 7.7

9/2/2009 80 1 29.4 17,000 9.9 8.6 118 7.8

9/2/2009 150 42 28.6 35,300 22.1 .4 6 7.6

9/2/2009 150 40 29.0 32,500 20.4 .2 4 7.7

9/2/2009 150 35 29.0 28,300 17.4 2.5 36 7.7

9/2/2009 150 30 29.0 25,400 15.4 3.5 49 7.7

9/2/2009 150 25 29.0 20,700 12.3 4.0 55 7.7

9/2/2009 150 20 28.9 18,900 11.3 1.8 25 7.5

9/2/2009 150 10 28.6 17,000 9.9 8.0 109 7.7
24 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 294946089361900—MRGO near Mile 37 near Hopedale, La.—Continued

9/2/2009 150 1 29.4 17,000 9.9 10.7 147 7.9

9/2/2009 250 30 28.9 24,000 14.5 4.1 57 7.9

9/2/2009 250 25 29.0 25,000 12.4 3.6 62 7.7

9/2/2009 250 20 28.7 18,600 11.0 1.9 26 7.6

9/2/2009 250 10 28.6 17,000 9.9 7.6 101 7.7

9/2/2009 250 1 29.7 17,000 9.9 11.7 163 8.0

10/8/2009 80 38 27.6 28,400 17.3 .6 7 7.6

10/8/2009 80 30 28.0 21,000 12.5 3.9 53 7.7

10/8/2009 80 20 27.3 17,900 10.5 4.0 53 7.7

10/8/2009 80 10 28.3 16,900 9.8 5.6 77 7.6

10/8/2009 80 1 28.9 16,200 9.4 5.5 75 7.6

10/8/2009 150 42 27.7 29,600 18.2 .5 7 7.4

10/8/2009 150 40 27.7 29,400 18.1 .3 4 7.4

10/8/2009 150 35 27.8 26,600 16.2 2.9 40 7.5

10/8/2009 150 30 28.0 20,600 12.2 3.9 54 7.5

10/8/2009 150 20 27.1 17,700 10.4 4.0 53 7.6

10/8/2009 150 10 28.3 16,900 9.8 4.4 59 7.6

10/8/2009 150 1 28.8 16,200 9.4 5.5 75 7.6

10/8/2009 250 34 27.6 24,000 14.7 2.5 35 7.3

10/8/2009 250 30 27.8 21,000 12.4 3.7 50 7.4

10/8/2009 250 20 27.7 17,800 10.5 3.8 51 7.5

10/8/2009 250 10 28.6 16,800 9.8 5.5 73 7.5

10/8/2009 250 1 29.0 16,000 9.4 5.4 74 7.5

11/6/2009 80 40 20.2 25,500 15.6 5.1 62 8.0

11/6/2009 80 30 19.8 19,500 11.6 6.6 78 8.1

11/6/2009 80 20 19.6 16,900 10.0 7.5 88 8.1

11/6/2009 80 10 19.7 16,800 9.9 7.6 88 8.1

11/6/2009 80 1 19.9 16,800 9.9 8.0 92 8.1

11/6/2009 150 40 20.3 25,000 15.3 1.2 14 7.9

11/6/2009 150 30 19.7 17,600 10.4 4.5 52 8.0

11/6/2009 150 25 19.6 17,100 10.1 6.9 80 8.0

11/6/2009 150 20 19.6 16,900 10.0 7.4 85 8.0

11/6/2009 150 10 19.7 16,800 9.9 7.7 90 8.0

11/6/2009 150 1 19.9 16,800 9.9 8.0 93 8.0

11/6/2009 250 20 19.6 16,900 9.9 7.7 90 8.0

11/6/2009 250 10 19.6 16,800 9.9 7.8 90 8.0

11/6/2009 250 1 20.0 16,800 9.9 8.4 98 8.0
Table 2 25

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295157089423200—MRGO near mile 44 near Yscloskey, La.

8/15/2008 60 8 28.3 30,500 18.9 6.1 87 7.8

8/15/2008 60 1 29.2 30,100 18.6 6.8 99 7.8

8/15/2008 120 37 27.7 31,100 19.3 5.9 84 7.8

8/15/2008 120 30 27.7 31,200 19.3 6.0 84 7.8

8/15/2008 120 25 27.8 31,200 19.3 6.0 85 7.8

8/15/2008 120 20 27.9 31,100 19.2 6.1 87 7.8

8/15/2008 120 10 28.6 30,700 19.0 6.7 97 7.8

8/15/2008 120 1 29.0 29,800 18.4 7.2 103 7.9

8/15/2008 180 40 27.7 31,200 19.3 5.7 81 7.8

8/15/2008 180 30 27.7 31,300 19.4 5.7 81 7.8

8/15/2008 180 25 27.7 31,300 19.4 5.7 81 7.8

8/15/2008 180 20 27.7 31,100 19.3 5.6 79 7.8

8/15/2008 180 10 28.5 30,600 18.9 6.1 88 7.8

8/15/2008 180 1 29.0 30,200 18.5 7.1 102 7.9

8/15/2008 240 29 27.7 31,200 19.3 5.5 78 7.8

8/15/2008 240 25 27.7 31,200 19.4 5.5 78 7.8

8/15/2008 240 20 27.7 31,100 19.3 5.5 78 7.8

8/15/2008 240 10 28.2 30,700 18.9 5.8 83 7.8

8/15/2008 240 1 29.1 29,600 18.3 6.8 99 7.9

8/15/2008 300 19 27.8 31,000 19.2 5.6 79 7.8

8/15/2008 300 10 28.6 30,500 18.8 6.0 87 7.8

8/15/2008 300 1 29.1 29,200 18.0 7.2 105 7.9

9/26/2008 60 8 25.6 16,900 9.8 6.5 85 --

9/26/2008 60 1 26.8 16,800 9.8 6.9 93 --

9/26/2008 120 33 25.9 19,900 11.8 5.5 72 --

9/26/2008 120 15 25.4 17,000 10.0 6.1 78 --

9/26/2008 120 1 26.9 16,800 9.8 7.6 102 --

9/26/2008 180 41 25.4 19,700 11.7 6.0 79 --

9/26/2008 180 20 25.5 17,800 10.5 5.9 76 --

9/26/2008 180 10 25.6 17,000 9.9 6.3 82 --

9/26/2008 180 1 27.0 16,700 9.8 8.0 108 --

9/26/2008 240 26 26.2 20,100 11.9 5.2 69 --

9/26/2008 240 15 26.6 17,300 10.1 5.4 71 --

9/26/2008 240 1 27.4 16,700 9.8 8.1 108 --

9/26/2008 300 7 26.1 16,700 9.8 7.6 99 --

9/26/2008 300 1 27.4 16,700 9.8 8.9 119 --

11/24/2008 60 6 14.2 18,300 10.8 9.4 97 8.0

11/24/2008 60 1 14.3 18,200 10.7 9.6 99 7.9

11/24/2008 120 24 13.8 18,800 11.1 9.5 98 7.9

11/24/2008 120 20 13.8 18,700 11.0 8.5 87 7.9
26 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295157089423200—MRGO near mile 44 near Yscloskey, La.—Continued

11/24/2008 120 10 14.0 18,300 10.8 9.4 97 7.9

11/24/2008 120 1 14.2 18,200 10.7 9.4 98 7.9

11/24/2008 180 36 15.1 28,700 17.7 7.0 79 7.7

11/24/2008 180 30 14.9 27,300 16.7 7.1 78 7.7

11/24/2008 180 20 14.0 22,100 13.2 7.7 80 7.8

11/24/2008 180 10 13.9 21,400 12.8 8.4 89 7.8

11/24/2008 180 1 13.8 18,300 10.8 9.5 98 7.9

11/24/2008 240 38 15.2 28,800 17.7 6.8 74 7.7

11/24/2008 240 30 15.0 28,400 17.4 5.9 65 7.7

11/24/2008 240 20 14.2 24,300 14.7 7.0 75 7.8

11/24/2008 240 10 13.6 18,800 11.1 8.6 88 7.9

11/24/2008 240 1 13.8 18,200 10.7 9.6 98 7.9

11/24/2008 300 8 13.8 18,400 10.8 9.8 100 7.9

11/24/2008 300 1 14.0 18,400 10.8 9.8 101 8.0

1/23/2009 90 17 10.6 23,000 13.9 10.6 104 8.0

1/23/2009 90 10 11.2 21,500 12.9 11.2 111 8.1

1/23/2009 90 1 11.6 21,300 12.8 11.7 116 8.1

1/23/2009 180 41 10.7 26,500 16.1 9.9 99 8.0

1/23/2009 180 30 10.5 25,200 15.5 10.2 100 8.0

1/23/2009 180 20 10.5 23,500 14.2 10.5 103 8.0

1/23/2009 180 10 10.8 21,400 12.8 11.2 110 8.1

1/23/2009 180 1 11.4 21,000 12.5 11.7 116 8.1

1/23/2009 270 6 11.9 21,000 12.6 11.8 117 8.2

1/23/2009 270 1 11.1 21,000 12.6 11.9 119 8.2

3/11/2009 90 20 16.8 23,700 14.4 9.7 110 7.7

3/11/2009 90 10 19.3 21,500 12.9 9.4 111 7.8

3/11/2009 90 1 20.3 21,400 12.9 10.0 118 7.9

3/11/2009 180 40 15.6 32,400 20.3 8.3 96 7.7

3/11/2009 180 30 15.7 32,000 20.0 8.1 92 7.7

3/11/2009 180 20 16.2 24,000 14.6 8.6 96 7.7

3/11/2009 180 10 19.3 21,500 12.9 9.1 106 7.8

3/11/2009 180 1 20.2 21,400 12.9 9.7 116 8.0

3/11/2009 270 27 15.6 31,800 19.9 8.3 94 7.8

3/11/2009 270 20 16.8 24,000 14.6 8.7 98 7.8

3/11/2009 270 10 19.3 21,500 13.0 9.1 107 7.9

3/11/2009 270 1 19.9 21,400 12.9 9.7 115 8.0

6/10/2009 90 23 27.2 14,000 8.1 4.8 63 7.7

6/10/2009 90 20 27.2 13,400 7.7 5.0 66 7.6

6/10/2009 90 10 28.5 13,100 7.5 6.8 89 7.7

6/10/2009 90 1 30.3 13,000 7.4 8.8 122 8.0
Table 2 27

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295157089423200—MRGO near mile 44 near Yscloskey, La.—Continued

6/10/2009 180 35 26.8 22,400 13.5 1.0 13 7.6

6/10/2009 180 30 28.0 19,900 12.7 3.5 35 7.5

6/10/2009 180 20 27.3 13,600 7.8 4.8 64 7.6

6/10/2009 180 10 28.5 13,100 7.5 6.7 90 7.7

6/10/2009 180 1 30.8 13,000 7.4 9.5 132 8.3

6/10/2009 270 20 27.3 13,700 7.9 4.8 62 7.7

6/10/2009 270 10 28.3 13,100 7.5 6.3 85 7.7

6/10/2009 270 1 30.9 13,000 7.4 9.3 130 8.2

7/30/2009 90 8 29.8 16,200 9.4 5.3 72 --

7/30/2009 90 1 30.5 15,800 9.2 7.3 104 --

7/30/2009 180 35 29.4 31,000 19.2 1.8 26 --

7/30/2009 180 30 29.5 24,500 14.8 1.6 23 --

7/30/2009 180 20 29.7 19,400 11.5 2.1 29 --

7/30/2009 180 10 29.8 17,000 9.9 2.1 30 --

7/30/2009 180 1 30.6 15,700 9.1 5.2 73 --

7/30/2009 270 30 29.5 29,700 18.3 .9 13 --

7/30/2009 270 20 29.7 18,700 11.0 1.9 27 --

7/30/2009 270 10 29.8 16,000 9.3 1.9 26 --

7/30/2009 270 1 30.5 15,700 9.1 5 70 --

9/2/2009 90 25 28.4 18,900 11.2 3 39 7.7

9/2/2009 90 20 27.9 16,900 9.9 5.5 74 7.7

9/2/2009 90 10 28.2 16,700 9.7 6.7 91 7.7

9/2/2009 90 1 29.6 16,700 9.7 9.7 135 7.9

9/2/2009 180 36 29.4 26,100 16.9 .3 5 7.6

9/2/2009 180 30 29.3 24,800 15.0 .3 4 7.6

9/2/2009 180 25 28.4 19,000 11.4 3.1 42 7.6

9/2/2009 180 20 28.0 16,900 9.9 5.6 75 7.6

9/2/2009 180 10 28.4 16,700 9.7 7 96 7.6

9/2/2009 180 1 29.8 16,700 9.7 9.3 130 7.8

9/2/2009 270 24 28.1 17,700 10.4 4.3 59 7.7

9/2/2009 270 20 27.9 17,000 10.0 4.4 59 7.7

9/2/2009 270 10 28.2 16,700 9.7 6.8 92 7.7

9/2/2009 270 1 30.0 16,700 9.7 9.6 135 7.9

10/8/2009 90 7 29.0 16,700 9.8 8.1 110 7.8

10/8/2009 90 1 29.0 16,700 9.8 8 110 7.8

10/8/2009 180 35 27.1 22,700 13.7 .7 9 7.5

10/8/2009 180 30 27.0 22,400 13.4 1.3 19 7.5

10/8/2009 180 25 27.5 18,900 11.2 3.8 51 7.5

10/8/2009 180 20 27.7 18,000 10.7 4.8 65 7.5

10/8/2009 180 10 28.3 16,900 9.9 6.7 91 7.6
28 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295157089423200—MRGO near mile 44 near Yscloskey, La.—Continued

10/8/2009 180 1 28.9 16,800 9.8 7.7 105 7.6

10/8/2009 270 30 27.1 22,200 13.4 1.1 14 7.5

10/8/2009 270 20 27.7 17,900 10.6 5.1 69 7.5

10/8/2009 270 10 28.2 16,900 9.9 6.3 86 7.6

10/8/2009 270 1 28.6 16,800 9.8 7.4 101 7.6

11/6/2009 90 20 19.4 15,400 9.0 9.0 88 8.3

11/6/2009 90 10 19.6 15,400 9.0 9.0 94 8.2

11/6/2009 90 1 19.6 15,200 8.9 11.7 95 8.2

11/6/2009 180 30 19.9 19,600 11.7 9.1 78 8.0

11/6/2009 180 20 19.7 15,400 9.1 9.0 93 8.0

11/6/2009 180 10 19.8 15,300 9.0 8.9 97 8.0

11/6/2009 180 1 19.8 15,300 8.9 9.6 99 8.0

11/6/2009 270 22 19.5 16,300 9.6 9.0 74 7.9

11/6/2009 270 20 19.5 15,400 9.0 9.0 83 7.9

11/6/2009 270 10 19.6 15,300 9.0 9.0 90 7.9

11/6/2009 270 1 19.8 15,100 8.8 8.8 100 7.9

Station number 295556089494400—MRGO near mile 52 near Violet, La.

8/15/2008 80 36 28.1 32,000 19.9 5.0 71 7.8

8/15/2008 80 30 28.1 31,100 19.3 5.4 77 7.8

8/15/2008 80 25 28.2 31,000 19.2 5.6 80 7.8

8/15/2008 80 20 28.3 30,800 19.1 5.8 83 7.8

8/15/2008 80 10 28.3 30,800 19.1 5.9 85 7.8

8/15/2008 80 1 28.6 30,800 19.0 6.2 89 7.8

8/15/2008 160 35 18.1 32,000 19.9 4.6 66 7.8

8/15/2008 160 30 28.1 31,700 19.7 4.8 68 7.8

8/15/2008 160 25 28.1 31,500 19.5 4.9 70 7.8

8/15/2008 160 20 28.2 31,100 19.2 5.2 74 7.8

8/15/2008 160 10 28.3 30,700 19.0 5.5 80 7.8

8/15/2008 160 1 28.7 30,500 18.8 6.3 92 7.9

8/15/2008 240 22 28.4 31,200 19.3 5.1 72 7.8

8/15/2008 240 10 28.2 31,100 19.3 5.3 75 7.8

8/15/2008 240 1 28.7 30,100 19.0 6.2 89 7.8

9/26/2008 80 31 25.5 17,300 10.1 5.4 70 --

9/26/2008 80 15 25.0 15,600 9.0 5.8 76 --

9/26/2008 80 1 26.4 15,500 9.0 8.4 108 --

9/26/2008 160 37 25.3 20,300 11.6 3.3 44 --

9/26/2008 160 25 25.2 16,100 9.0 4.3 60 --
Table 2 29

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295556089494400—MRGO near mile 52 near Violet, La.—Continued

9/26/2008 160 10 25.2 15,500 8.6 7.2 92 --

9/26/2008 160 1 26.5 15,500 8.6 8.2 103 --

9/26/2008 240 19 24.7 15,800 8.8 6.6 84 --

9/26/2008 240 10 25.2 15,600 8.6 6.8 87 --

9/26/2008 240 1 27.8 15,500 8.6 9.3 125 --

11/24/2008 80 32 14.5 21,700 13.0 8.8 93 7.8

11/24/2008 80 20 13.8 19,000 11.2 9.7 100 7.9

11/24/2008 80 10 13.8 18,200 10.7 9.7 99 7.9

11/24/2008 80 1 13.9 17,900 10.5 9.9 102 8.0

11/24/2008 160 34 15.1 25,400 14.8 7.3 78 7.7

11/24/2008 160 30 14.4 22,700 13.1 8.3 87 7.8

11/24/2008 160 20 14.2 20,900 12.0 8.5 89 7.8

11/24/2008 160 10 14.1 19,200 10.9 9.0 92 7.9

11/24/2008 160 1 13.9 17,900 10.1 9.7 100 7.9

11/24/2008 240 25 14.0 19,700 11.2 8.9 92 7.8

11/24/2008 240 20 14.0 18,800 10.6 9.0 93 7.8

11/24/2008 240 10 14.0 18,700 10.5 9.0 93 7.8

11/24/2008 240 1 13.9 17,900 10.1 9.6 99 7.9

1/23/2009 80 27 10.7 25,300 15.2 10.0 99 7.9

1/23/2009 80 20 10.5 20,300 12.3 10.4 101 8.0

1/23/2009 80 10 10.8 17,500 10.3 10.9 105 8.0

1/23/2009 80 1 11.5 16,400 9.7 11.4 111 8.1

1/23/2009 160 35 10.9 27,500 16.9 9.6 97 7.7

1/23/2009 160 30 10.7 26,100 15.8 9.6 95 7.9

1/23/2009 160 20 10.6 21,700 13.2 10.3 101 8.0

1/23/2009 160 10 10.8 17,600 10.4 11.0 105 8.0

1/23/2009 160 1 11.4 16,700 9.8 11.2 109 8.1

1/23/2009 240 12 10.9 18,400 10.9 11.1 107 8.0

1/23/2009 240 1 11.4 16,700 9.8 11.4 111 8.1

3/11/2009 80 30 16.4 26,500 16.3 7.5 85 7.6

3/11/2009 80 20 17.5 22,100 13.3 8.7 98 7.7

3/11/2009 80 10 18.1 17,100 10.1 9.3 104 7.7

3/11/2009 80 1 19.7 15,500 9.1 9.5 109 7.8

3/11/2009 160 34 16.3 26,900 16.6 8.5 96 7.4

3/11/2009 160 30 16.5 26,500 16.4 8.4 95 8.4

3/11/2009 160 20 17.2 22,900 14.0 8.8 98 7.5

3/11/2009 160 10 18.2 16,700 9.8 9.4 105 7.6

3/11/2009 160 1 19.6 15,500 9.1 9.4 109 7.7

3/11/2009 240 20 17.4 20,200 12.0 8.9 101 7.7

3/11/2009 240 10 18.3 16,600 9.8 9.4 105 7.8
30 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295556089494400—MRGO near mile 52 near Violet, La.—Continued

3/11/2009 240 1 19.5 15,600 9.1 9.4 108 7.8

6/10/2009 80 18 28.9 12,800 7.3 6.7 90 7.7

6/10/2009 80 10 29.3 12,600 7.2 7.1 95 7.7

6/10/2009 80 1 30.0 12,100 6.9 8.3 114 7.9

6/10/2009 160 34 27.1 20,500 12.2 1.9 26 7.4

6/10/2009 160 30 27.5 19,700 11.8 2.9 35 7.4

6/10/2009 160 20 28.4 13,100 7.5 5.6 76 7.6

6/10/2009 160 10 29.2 12,700 7.3 6.9 94 7.7

6/10/2009 160 1 30.1 11,900 6.8 8.1 112 7.9

6/10/2009 240 32 27.0 18,100 10.5 2.8 37 7.6

6/10/2009 240 20 28.4 13,100 7.5 5.7 76 7.6

6/10/2009 240 10 29.3 12,600 7.2 7.1 95 7.7

6/10/2009 240 1 30.2 12,000 6.8 8.3 113 8.0

7/30/2009 80 20 29.5 17,200 10.1 3.6 50 --

7/30/2009 80 10 30.1 15,800 9.2 5.1 72 --

7/30/2009 80 1 30.7 15,300 8.9 7.2 102 --

7/30/2009 160 30 29.9 21,800 13.0 1.5 22 --

7/30/2009 160 20 29.5 17,200 10.0 2.8 40 --

7/30/2009 160 10 29.8 16,100 9.4 4.1 57 --

7/30/2009 160 1 30.8 15,200 8.8 6.6 93 --

7/30/2009 240 22 29.5 17,000 10.0 3.4 47 --

7/30/2009 240 20 29.5 17,000 10.0 3.3 46 --

7/30/2009 240 10 29.5 16,600 9.7 3.9 54 --

7/30/2009 240 1 30.9 14,900 8.6 7.3 103 --

9/2/2009 80 32 29.2 24,500 14.8 .6 7 7.6

9/2/2009 80 30 28.6 19,600 11.6 2.6 37 7.6

9/2/2009 80 20 28.1 18,100 10.7 6.5 87 7.6

9/2/2009 80 10 28.6 17,800 10.5 8.6 117 7.7

9/2/2009 80 1 29.0 17,100 10.0 12.0 165 8.0

9/2/2009 160 33 29.2 24,700 14.9 .5 7 7.8

9/2/2009 160 30 28.1 19,000 11.3 2.5 35 7.7

9/2/2009 160 25 28.2 18,600 10.9 5.8 79 7.7

9/2/2009 160 20 28.2 18,500 10.9 6.0 82 7.7

9/2/2009 160 10 28.4 18,000 10.5 7.4 100 7.7

9/2/2009 160 1 29.8 16,900 9.9 15.6 218 8.3

9/2/2009 240 20 28.0 18,100 10.6 6.6 90 8.1

9/2/2009 240 10 27.9 17,500 10.3 6.9 94 8.0

9/2/2009 240 1 30.1 16,700 9.7 16.0 224 8.0

10/8/2009 80 30 26.9 17,800 10.4 2.8 38 7.5

10/8/2009 80 20 27.7 16,200 9.4 4.4 58 7.5
Table 2 31

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295556089494400—MRGO near mile 52 near Violet, La.—Continued

10/8/2009 80 10 28.8 15,800 9.2 6.4 87 7.5

10/8/2009 80 1 29.0 15,600 9.1 6.3 86 7.5

10/8/2009 160 32 26.9 18,600 11.1 1.0 14 7.4

10/8/2009 160 30 26.9 17,700 10.4 2.9 39 7.4

10/8/2009 160 20 27.8 16,200 9.4 5.1 69 7.5

10/8/2009 160 10 28.7 15,800 9.2 5.6 76 7.5

10/8/2009 160 1 29.2 14,100 8.2 5.3 72 7.5

10/8/2009 240 19 28.4 16,100 9.3 6.0 81 7.4

10/8/2009 240 10 28.6 15,900 9.2 6.7 92 7.5

10/8/2009 240 1 29.4 13,600 7.8 5.4 73 7.5

11/13/2009 80 32 18.5 15,100 8.8 7.7 86 7.8

11/13/2009 80 30 18.5 15,200 8.9 7.7 86 7.7

11/13/2009 80 30 18.6 16,000 9.4 7.8 88 7.7

11/13/2009 80 10 18.7 15,100 8.8 8.0 91 7.7

11/13/2009 80 1 18.5 11,700 6.7 8.5 95 7.8

11/13/2009 160 35 18.5 16,100 9.5 7.6 85 7.6

11/13/2009 160 30 18.5 16,100 9.5 7.6 86 7.6

11/13/2009 160 20 18.6 16,000 9.4 7.8 88 7.6

11/13/2009 160 10 18.5 14,700 8.6 8.1 91 7.7

11/13/2009 160 1 18.8 11,400 6.5 8.5 95 7.7

11/13/2009 240 17 18.7 15,200 8.9 .9 10 7.4

11/13/2009 240 15 18.7 15,800 9.3 6.3 71 7.5

11/13/2009 240 10 18.6 14,800 8.6 7.8 87 7.6

11/13/2009 240 1 18.8 10,300 5.8 8.0 89 7.7

Station number 295709089511200—MRGO near mile 54 near Violet, La.

9/26/2008 80 11 24.7 15,500 9.0 7.7 98 --

9/26/2008 80 1 26.0 15,300 8.9 9.5 123 --

9/26/2008 160 37 25.8 15,700 9.1 4.5 58 --

9/26/2008 160 30 24.6 16,000 9.3 6.6 82 --

9/26/2008 160 15 24.5 15,600 9.0 7.6 97 --

9/26/2008 160 1 25.8 15,400 8.9 9.2 117 --

9/26/2008 240 25 24.5 15,600 9.0 7.5 95 --

9/26/2008 240 15 24.7 15,600 9.0 8.4 108 --

9/26/2008 240 1 27.3 15,400 8.9 11.2 150 --

11/24/2008 90 5 13.8 17,900 10.5 8.4 86 7.9

11/24/2008 90 1 14.0 17,700 10.4 9.3 98 7.9

11/24/2008 170 19 13.9 19,100 10.6 9.4 98 7.9

11/24/2008 170 10 13.8 18,400 10.5 9.7 99 7.9

11/24/2008 170 1 13.9 18,000 10.1 10.0 103 8.0

11/24/2008 260 36 15.9 28,200 16.6 6.4 68 7.6
32 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295709089511200—MRGO near mile 54 near Violet, La.—Continued

11/24/2008 260 30 14.8 22,100 12.7 7.2 79 7.8

11/24/2008 260 20 14.0 21,200 12.1 9.0 96 7.8

11/24/2008 260 10 13.8 18,900 10.7 9.6 99 7.9

11/24/2008 260 1 13.9 18,100 10.2 10.1 104 8.0

11/24/2008 335 36 15.9 28,300 16.6 6.3 70 7.6

11/24/2008 335 30 14.5 21,700 12.4 7.4 78 7.7

11/24/2008 335 20 14.0 19,500 11.0 9.3 96 7.9

11/24/2008 335 10 13.7 18,800 10.6 9.7 99 7.9

11/24/2008 335 1 13.8 18,100 10.2 10.1 104 7.9

11/24/2008 425 12 13.7 18,600 10.5 9.8 100 7.9

11/24/2008 425 1 14.0 18,000 10.1 9.8 101 7.9

1/23/2009 80 10 11.5 17,500 10.3 11.1 108 8.0

1/23/2009 80 1 11.6 17,500 10.3 11.2 109 8.1

1/23/2009 160 36 11.0 28,100 17.3 9.6 98 7.9

1/23/2009 160 30 10.8 27,100 16.6 9.3 93 7.9

1/23/2009 160 20 10.5 23,900 14.5 9.9 98 7.9

1/23/2009 160 10 10.9 17,900 10.5 10.6 104 8.0

1/23/2009 160 1 11.4 17,700 10.5 11.0 108 8.0

1/23/2009 240 18 10.8 20,100 12.2 10.6 103 8.0

1/23/2009 240 10 11.3 17,800 10.6 10.9 106 8.0

1/23/2009 240 1 11.5 17,800 10.5 11.1 108 8.0

3/11/2009 90 9 18.7 16,100 9.4 9.5 108 7.7

3/11/2009 90 1 19.5 15,800 9.3 10.3 118 7.9

3/11/2009 180 35 16.3 20,000 11.9 8.4 92 7.1

3/11/2009 180 30 16.4 23,700 14.4 8.2 91 7.3

3/11/2009 180 20 17.5 18,300 10.9 8.7 97 7.4

3/11/2009 180 10 18.7 16,000 9.4 9.6 108 7.6

3/11/2009 180 1 19.7 15,800 9.3 10.4 120 7.9

3/11/2009 270 17 17.8 16,900 9.9 9.3 104 7.7

3/11/2009 270 10 19.4 16,000 9.4 9.8 113 7.8

3/11/2009 270 1 19.9 15,800 9.2 10.9 125 8.1

6/10/2009 60 10 28.5 12,700 7.2 6.6 89 7.7

6/10/2009 60 1 29.1 12,400 7.1 8.0 108 7.8

6/10/2009 120 31 28.2 13,000 7.4 5.8 77 7.7

6/10/2009 120 20 28.5 12,800 7.3 6.4 87 7.7

6/10/2009 120 10 28.6 12,700 7.2 6.6 89 7.7

6/10/2009 120 1 29.5 12,000 6.8 7.7 106 7.8

6/10/2009 180 35 27.5 14,000 8.0 4.5 64 7.7

6/10/2009 180 30 28.1 13,300 7.6 5.6 75 7.7
Table 2 33

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295709089511200—MRGO near mile 54 near Violet, La.—Continued

6/10/2009 180 20 28.4 12,800 7.3 6.2 83 7.6

6/10/2009 180 10 28.7 12,500 7.1 6.7 91 7.7

6/10/2009 180 1 29.8 11,800 6.7 7.9 108 7.8

6/10/2009 240 15 28.5 12,600 7.2 5.9 79 7.7

6/10/2009 240 10 28.7 12,500 7.1 6.0 84 7.7

6/10/2009 240 1 29.4 11,900 6.8 7.7 105 7.8

6/10/2009 300 8 29.6 11,800 6.7 8.9 110 8.0

6/10/2009 300 1 29.6 11,800 6.7 8.1 110 8.0

7/30/2009 80 20 29.6 16,900 9.8 4.9 67 --

7/30/2009 80 10 29.8 16,000 9.3 5.8 81 --

7/30/2009 80 1 30.6 14,800 8.5 8.1 113 --

7/30/2009 160 30 29.9 21,800 13.0 1.5 22 --

7/30/2009 160 20 29.5 17,200 10.0 2.8 40 --

7/30/2009 160 10 29.8 16,100 9.4 4.1 57 --

7/30/2009 160 1 30.8 15,200 8.8 6.6 93 --

7/30/2009 240 10 29.8 16,300 9.5 6.0 84 --

7/30/2009 240 1 30.8 14,400 8.3 8.8 125 --

9/2/2009 80 9 28.4 17,800 10.4 7.7 105 8.0

9/2/2009 80 1 28.6 17,700 10.4 8.5 117 8.0

9/2/2009 160 35 28.1 17,900 10.5 6.9 94 7.9

9/2/2009 160 30 28.1 17,800 10.5 7.0 95 7.9

9/2/2009 160 20 28.3 17,800 10.5 7.4 101 7.9

9/2/2009 160 10 28.4 17,700 10.4 7.8 105 7.9

9/2/2009 160 1 28.5 17,600 10.3 8.5 116 7.9

9/2/2009 240 32 28.0 17,900 10.5 6.6 89 8.0

9/2/2009 240 30 28.0 17,800 10.5 6.7 91 7.9

9/2/2009 240 20 28.1 17,800 10.5 6.8 92 7.9

9/2/2009 240 10 28.2 17,700 10.4 7.0 92 7.8

9/2/2009 240 1 27.8 16,100 9.3 13.3 185 8.2

10/8/2009 80 8 28.3 15,300 8.8 4.8 65 7.7

10/8/2009 80 1 29.0 13,900 8.0 8.2 112 7.7

10/8/2009 160 34 27.1 17,900 10.5 1.2 15 7.5

10/8/2009 160 30 27.0 17,400 10.2 2.0 26 7.5

10/8/2009 160 20 27.7 16,000 9.4 4.5 60 7.5

10/8/2009 160 10 27.7 15,400 9.0 4.8 64 7.5

10/8/2009 160 1 29.0 14,100 8.1 7.4 101 7.5

10/8/2009 240 25 27.5 16,700 9.8 2.8 37 7.5

10/8/2009 240 20 27.5 16,200 9.4 4.4 58 7.5

10/8/2009 240 10 27.8 15,400 8.9 4.7 63 7.5

10/8/2009 240 1 28.6 14,400 8.3 6.1 82 7.5
34 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295709089511200—MRGO near mile 54 near Violet, La.—Continued

11/13/2009 80 15 18.8 14,100 8.2 2.3 26 7.6

11/13/2009 80 10 18.9 14,200 8.3 8.8 99 7.7

11/13/2009 80 1 19.1 13,200 7.6 9.5 107 7.8

11/13/2009 160 36 18.7 15,700 9.2 .9 10 7.6

11/13/2009 160 30 18.6 15,900 9.3 6.9 78 7.7

11/13/2009 160 20 18.6 14,900 8.7 8.0 90 7.7

11/13/2009 160 10 18.9 14,000 8.1 8.9 101 7.8

11/13/2009 240 22 18.5 15,000 8.8 6.8 77 7.7

11/13/2009 240 20 18.4 14,800 8.6 7.9 88 7.7

11/13/2009 240 10 18.6 13,800 8.0 8.5 96 7.8

11/13/2009 240 1 19.1 12,900 7.5 9.4 106 7.8

Station number 3000189089551200—MRGO near mile 59 near Michoud, La.

8/15/2008 80 27 28.5 31,600 19.6 4.1 59 7.7

8/15/2008 80 20 28.8 29,100 17.7 4.5 65 7.7

8/15/2008 80 10 29.2 26,600 16.2 5.9 84 7.8

8/15/2008 80 1 30.7 22,700 13.6 11.0 162 8.3

8/15/2008 160 42 28.5 32,000 19.9 4.2 60 7.7

8/15/2008 160 30 28.5 31,800 19.7 4.4 64 7.7

8/15/2008 160 25 28.6 30,900 19.1 4.7 69 7.7

8/15/2008 160 20 28.9 29,500 18.1 5.4 78 7.8

8/15/2008 160 10 29.5 26,200 16.0 6.8 98 7.9

8/15/2008 160 1 30.6 22,700 13.6 11.6 167 8.3

8/15/2008 240 29 28.5 31,900 19.8 4.2 61 7.7

8/15/2008 240 20 28.9 29,200 17.9 5.2 74 7.7

8/15/2008 240 10 29.4 26,500 16.1 6.3 91 7.8

8/15/2008 240 1 30.2 23,000 13.8 9.6 139 8.1

9/26/2008 80 34 25.9 15,400 8.6 5.9 76 --

9/26/2008 80 15 26.2 14,900 8.2 6.1 79 --

9/26/2008 80 5 26.8 14,600 8.0 6.6 87 --

9/26/2008 80 1 28.4 14,400 7.9 7.1 94 --

9/26/2008 160 43 25.8 15,700 8.7 5.8 75 --

9/26/2008 160 20 26.2 15,200 8.4 5.8 78 --

9/26/2008 160 10 26.8 14,700 8.1 6.7 88 --

9/26/2008 160 1 28.7 14,500 8.0 7.0 95 --

9/26/2008 240 27 26.1 15,100 8.4 6.3 82 --

9/26/2008 240 15 26.1 14,700 8.1 5.8 75 --

9/26/2008 240 1 29.3 14,200 7.8 7.6 104 --
Table 2 35

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 3000189089551200—MRGO near mile 59 near Michoud, La.—Continued

11/24/2008 80 26 14.6 19,600 11.6 8.6 90 7.8

11/24/2008 80 20 14.4 19,000 11.2 9.2 96 7.9

11/24/2008 80 10 14.5 19,000 11.2 9.5 99 7.9

11/24/2008 80 1 14.6 18,900 11.2 9.6 101 7.9

11/24/2008 160 43 14.7 21,000 12.0 7.5 82 7.7

11/24/2008 160 30 14.6 19,700 11.2 9.3 98 7.9

11/24/2008 160 20 14.6 19,700 11.2 9.4 98 7.9

11/24/2008 160 10 14.7 18,700 10.5 9.6 100 7.9

11/24/2008 160 1 15.8 18,400 10.4 9.9 106 7.9

11/24/2008 240 28 14.6 20,500 11.7 8.9 94 7.8

11/24/2008 240 20 14.5 19,900 11.3 9.1 95 7.9

11/24/2008 240 10 14.7 18,700 10.5 9.4 99 7.9

11/24/2008 240 1 16.0 18,400 10.4 10.0 107 7.9

1/23/2009 80 33 11.5 27,800 17.1 8.8 90 7.8

1/23/2009 80 30 11.3 27,100 16.6 8.4 84 7.8

1/23/2009 80 20 12.4 17,700 10.5 9.5 95 7.9

1/23/2009 80 10 12.7 17,300 10.3 10.0 100 7.9

1/23/2009 80 1 12.8 17,300 10.2 10.2 102 7.9

1/23/2009 160 41 12.0 29,200 18.1 7.8 82 7.8

1/23/2009 160 30 11.2 26,900 16.6 7.9 81 7.8

1/23/2009 160 20 12.5 17,600 10.4 9.5 93 7.9

1/23/2009 160 10 12.6 17,400 10.3 10.0 100 7.9

1/23/2009 160 1 12.8 17,300 10.2 10.2 102 7.9

1/23/2009 240 34 11.7 28,800 17.8 8.0 83 7.8

1/23/2009 240 30 11.4 27,900 17.1 7.9 81 7.8

1/23/2009 240 20 11.1 20,400 12.2 8.9 87 7.9

1/23/2009 240 10 12.4 17,600 10.4 9.8 98 7.9

1/23/2009 240 1 13.0 17,300 10.2 10.3 104 8.0

3/11/2009 80 27 16.3 21,600 13.1 8.2 89 7.6

3/11/2009 80 20 16.6 17,200 10.3 9.2 100 7.7

3/11/2009 80 10 18.2 14,100 8.1 10.7 118 8.1

3/11/2009 80 1 19.7 14,000 8.1 11.8 134 8.4

3/11/2009 160 42 16.2 22,000 13.3 8.8 97 7.6

3/11/2009 160 30 16.2 21,900 13.2 8.7 96 7.6

3/11/2009 160 20 16.4 17,500 10.6 9.2 102 7.6

3/11/2009 160 10 18.0 14,100 8.2 10.8 120 8.0

3/11/2009 160 1 19.5 17,000 8.1 11.5 130 8.2

3/11/2009 240 25 16.3 21,000 12.8 9.1 102 7.7

3/11/2009 240 20 16.5 17,100 10.0 9.3 101 7.8

3/11/2009 240 10 18.3 14,400 8.4 10.5 119 8.1
36 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 3000189089551200—MRGO near mile 59 near Michoud, La.—Continued

3/11/2009 240 1 20.4 14,300 8.3 11.4 131 8.3

7/30/2009 80 30 29.6 15,600 9.0 5.0 69 --

7/30/2009 80 20 29.9 14,900 8.6 4.5 62 --

7/30/2009 80 10 30.6 14,100 8.1 6.4 89 --

7/30/2009 80 1 31.0 14,000 8.0 6.8 96 --

7/30/2009 160 40 29.2 17,300 10.1 2.8 38 --

7/30/2009 160 30 29.6 16,200 9.4 3.6 50 --

7/30/2009 160 20 30.0 14,700 8.5 4.5 63 --

7/30/2009 160 10 30.9 14,000 8.0 7.0 98 --

7/30/2009 160 1 30.9 14,000 8.0 7.1 99 --

7/30/2009 240 20 30.0 14,700 8.5 4.9 68 --

7/30/2009 240 10 30.9 14,300 8.2 6.2 87 --

7/30/2009 240 1 30.9 14,000 8.1 7.2 101 --

9/2/2009 80 29 28.0 17,200 10.1 5.2 71 7.9

9/2/2009 80 20 28.4 16,600 9.7 6.0 82 7.8

9/2/2009 80 10 28.7 15,400 8.9 6.2 84 7.8

9/2/2009 80 1 30.7 15,200 8.8 9.8 138 8.0

9/2/2009 160 40 28.1 17,400 10.2 5.0 68 7.8

9/2/2009 160 30 28.1 17,400 10.2 5.2 70 7.8

9/2/2009 160 20 28.5 16,600 9.7 6.1 84 7.7

9/2/2009 160 10 29.0 15,400 9.9 7.0 96 7.8

9/2/2009 160 1 30.9 15,100 8.7 9.7 137 8.0

9/2/2009 240 27 28.1 16,400 9.6 5.2 70 8.0

9/2/2009 240 20 28.7 16,400 9.6 6.5 89 7.9

9/2/2009 240 10 29.1 15,500 9.0 7.2 99 7.9

9/2/2009 240 1 30.9 15,100 8.7 10.0 143 8.0

10/8/2009 80 26 27.5 14,500 8.4 4.4 58 7.7

10/8/2009 80 20 27.8 13,500 7.7 5.5 74 7.7

10/8/2009 80 10 28.6 13,200 7.6 6.2 83 7.6

10/8/2009 80 1 29.3 12,400 7.0 7.5 102 7.6

10/8/2009 160 42 27.2 15,500 9.0 -- -- 7.6

10/8/2009 160 40 27.2 15,400 9.0 3.2 43 7.6

10/8/2009 160 30 27.3 14,900 8.7 3.5 46 7.5

10/8/2009 160 20 27.7 13,600 7.8 5.1 67 7.5

10/8/2009 160 10 28.6 13,100 7.5 6.5 89 7.5

10/8/2009 160 1 29.5 12,800 7.2 7.8 107 7.5

10/8/2009 240 30 27.4 14,600 8.4 3.9 51 7.5

10/8/2009 240 20 27.5 14,000 8.1 4.5 60 7.5

10/8/2009 240 10 29.6 13,300 7.6 6.1 82 7.5

10/8/2009 240 1 29.6 13,200 7.6 8.0 109 7.5
Table 2 37

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 3000189089551200—MRGO near mile 59 near Michoud, La.—Continued

11/13/2009 80 30 19.0 12,200 7.0 8.0 89 7.5

11/13/2009 80 20 18.9 11,800 6.7 8.4 94 7.5

11/13/2009 80 10 19.2 11,700 6.7 8.8 99 7.5

11/13/2009 80 1 21.0 11,700 6.7 9.1 107 7.6

11/13/2009 160 42 19.2 14,100 8.2 .4 5 7.3

11/13/2009 160 40 19.1 14,800 8.6 6.1 70 7.4

11/13/2009 160 30 19.0 12,300 7.1 7.9 89 7.5

11/13/2009 160 30 18.9 12,100 7.0 8.0 90 7.5

11/13/2009 160 10 19.0 11,800 6.8 8.4 94 7.5

11/13/2009 160 1 21.7 11,800 6.7 9.2 109 7.6

11/13/2009 240 30 18.9 12,000 6.9 7.8 88 7.6

11/13/2009 240 20 18.8 11,900 6.9 8.1 91 7.6

11/13/2009 240 10 19.5 11,800 6.7 8.4 96 7.6

11/13/2009 240 1 22.0 11,700 6.7 9.0 106 7.6

Station number 295602089501600—Violet Canal near MRGO near Violet, La.

8/15/2008 29 28.9 28,300 17.3 6.2 88 7.8

8/15/2008 20 28.9 28,300 17.4 6.1 88 7.8

8/15/2008 10 28.9 28,600 17.5 5.9 84 7.8

8/15/2008 1 28.9 28,500 17.5 5.9 85 7.8

11/24/2008 20 14.4 18,800 11.1 8.2 85 7.6

11/24/2008 10 14.4 18,800 11.1 8.2 85 7.6

11/24/2008 1 14.4 18,800 11.1 8.2 85 7.6

6/10/2009 39 29.3 12,800 7.3 7.0 94 7.8

6/10/2009 30 29.2 12,700 7.3 6.8 93 7.7

6/10/2009 20 29.2 12,800 7.3 6.7 91 7.7

6/10/2009 10 29.3 12,800 7.3 6.6 90 7.7

6/10/2009 1 29.3 12,700 7.2 6.6 90 7.7

Station number 295655089495600—Lake Borgne near MRGO near Violet, La.

8/15/2008 7 28.8 15,800 9.5 10.6 146 8.0

8/15/2008 1 29.2 14,900 8.6 11.1 153 8.4

9/26/2008 7 24.3 15,700 9.1 8.5 107 --

9/26/2008 1 26.7 14,700 8.5 9.9 134 --

11/24/2008 5 13.9 18,000 10.6 9.9 102 7.9

11/24/2008 1 14.0 18,000 10.6 9.9 102 7.9

1/23/2009 6 10.9 20,900 12.5 10.8 107 8.0

1/23/2009 1 11.0 20,600 12.3 10.5 103 8.0

3/11/2009 6 20.0 14,900 8.6 10.1 118 8.1

3/11/2009 1 20.9 14,300 8.3 10.2 119 8.1
38 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 2. Water-quality data for selected sites in the Mississippi River-Gulf Outlet (MRGO), Lake Borgne, and Violet Canal in 

southeastern Louisiana, August 2008 through December 2009.—Continued

[see fig. 1 for site locations. μS/cm, microsiemens per centimeter; --, no data. Rock barrier construction started in February 2009 and extended above the water 

surface of the entire channel width on June 4, 2009]

Date

Distance from 

left bank looking 

downstream 

(yards)

Depth 

(feet)

Temperature 

(degrees 

Celsius)

Specific 

conductance 

(μS/cm at 25 

degrees Celsius)

Salinity 

(parts per 

thousand)

Dissolved 

oxygen 

(milligrams 

per liter)

Oxygen 

(percent 

saturation)

pH 

(standard 

units)

Station number 295655089495600—Lake Borgne near MRGO near Violet, La.—Continued

6/10/2009 5 28.0 13,200 7.5 6.7 90 7.2

6/10/2009 1 30.5 11,100 6.3 9.2 127 8.2

9/2/2009 6 27.4 17,800 10.5 6.3 84 8.2

9/2/2009 1 28.9 17,900 10.5 9.7 134 8.2

10/8/2009 6 28.0 16,000 9.3 4.5 60 7.5

10/8/2009 1 27.9 16,000 9.4 4.5 60 7.5

11/13/2009 6 17.7 13,000 7.5 9.0 98 7.6

11/13/2009 1 19.0 11,400 6.5 8.6 97 7.7
Table 3 39

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

294900089350800—Mississippi River-Gulf Outlet near mile 35 near Hopedale, La. (10-foot depth)

1 24.6 28.0 -- -- 29.0 27.7 -- 19.5

2 25.2 28.4 -- -- 29.3 27.5 -- 19.8

3 25.5 27.8 -- -- 29.3 27.1 -- 19.1

4 25.3 27.5 -- -- -- 26.8 -- 17.9

5 25.3 26.8 -- -- -- 26.8 -- 15.3

6 25.9 27.1 -- -- -- 26.8 -- 15.2

7 26.2 28.6 -- 30.1 -- 27.2 26.5 18.6

8 -- 29.7 -- 31.5 29.0 28.1 27.1 21.4

9 -- 29.5 28.9 31.2 28.8 28.4 23.8 21.5

10 -- 27.9 30.3 30.9 -- -- 22.0 18.8

11 -- 26.9 31.7 30.8 -- 27.3 21.4 18.1

12 -- 26.5 31.4 30.5 -- 27.1 21.1 17.4

13 -- 26.0 30.6 30.4 -- -- 21.6 18.7

14 -- 25.8 29.6 31.4 -- -- 21.6 21.4

15 -- 25.9 -- 31.5 -- -- 22.8 21.6

16 -- 25.6 -- 31.1 28.3 -- 22.2 19.4

17 -- 25.2 -- 30.8 -- -- 20.3 19.0

18 -- 24.9 -- 30.8 -- -- 19.9 18.6

19 24.6 24.7 -- 30.8 -- -- 20.3 18.3

20 23.6 24.9 -- 30.7 -- -- 20.5 17.7

21 24.0 25.1 -- -- -- 21.7 20.8 18.4

22 21.7 24.1 25.3 -- -- -- 21.9 20.6 19.8

23 22.5 24.7 27.3 -- -- -- 22.0 21.0 21.3

24 23.2 25.8 27.9 29.9 29.2 29.3 21.2 21.1 21.7

25 23.6 26.0 29.9 -- 28.4 29.5 20.6 20.6 18.6

26 24.1 25.7 31.2 30.4 -- 29.3 20.2 19.5 16.8

27 24.1 26.2 31.2 -- -- 29.2 20.3 19.1 16.8

28 23.8 26.9 30.7 -- -- -- 20.3 19.4 16.6

29 24.0 27.3 29.8 -- -- 28.5 21.2 20.2 17.1

30 24.4 27.2 29.5 -- -- 27.7 22.9 21.6 18.6

31 27.5 -- -- 22.2 19.7

Mean -- -- 27.5 29.5 29.7 28.8 24.8 21.2 18.8

Maximum -- -- 31.2 31.7 31.5 29.6 28.4 27.1 21.7

Minimum -- -- 24.7 27.1 26.6 27.5 20.2 19.1 15.2

Table 3
40 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.—Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

295311089445100—Mississippi River-Gulf Outlet near mile 46 near Yscloskey, La. (10-foot depth)

1 15.4 -- -- 20.2 24.5 27.4 31.5 30.1 28.5 27.0 19.9 15.0

2 15.2 -- -- 20.1 24.9 27.9 31.8 30.1 28.4 26.8 19.3 14.6

3 15.5 -- -- 19.8 25.1 27.4 31.9 29.7 28.4 26.7 19.0 14.3

4 15.8 -- -- 20.0 25.0 27.7 32.1 29.8 28.5 26.7 19.2 13.4

5 16.7 -- -- 20.6 25.3 27.2 32.1 30.1 28.3 26.7 19.6 12.5

6 18.1 -- -- 20.1 25.7 26.4 31.6 30.7 28.4 26.9 19.4 11.9

7 17.6 -- -- 18.3 26.1 26.8 30.7 30.8 28.4 27.2 19.5 11.9

8 16.8 -- -- 17.5 26.2 27.4 30.2 30.7 28.4 27.9 19.8 12.6

9 16.8 -- -- 17.4 26.4 27.9 30.0 30.6 28.4 28.2 19.7 13.9

10 17.4 -- -- 18.0 26.8 28.1 29.8 30.6 28.3 27.9 19.3 13.9

11 17.1 -- -- 18.9 27.2 28.5 30.5 30.6 27.9 27.0 18.9 12.7

12 15.6 -- 20.0 19.9 27.5 28.6 30.8 30.5 27.3 26.7 18.4 11.5

13 15.0 -- 20.0 20.1 27.6 29.1 31.2 30.3 27.1 26.7 18.1 11.5

14 13.8 -- 20.5 20.7 27.6 29.3 31.5 30.5 27.2 26.7 18.4 12.0

15 13.3 -- 20.2 20.2 27.6 29.6 31.2 30.4 27.5 27.2 18.3 13.4

16 11.8 -- 20.1 20.6 27.9 29.9 30.7 30.2 27.6 26.9 18.6 13.8

17 10.6 -- 20.0 20.6 27.3 30.2 30.2 29.9 27.6 24.6 18.1 13.2

18 11.1 -- 20.4 20.6 25.1 30.5 29.8 29.9 27.9 22.2 17.4 12.2

19 11.6 -- 20.9 21.0 23.6 31.1 29.6 30.0 28.1 21.2 17.2 12.1

20 11.2 -- 21.1 21.3 23.1 31.4 29.6 29.9 28.3 20.7 16.9 11.5

21 10.3 -- 20.9 21.4 23.3 31.6 29.7 29.7 28.4 20.7 16.8 11.7

22 10.2 -- 20.8 21.5 23.9 31.8 29.5 29.5 29.2 20.9 16.6 11.9

23 -- -- 20.5 21.8 24.5 31.7 29.4 28.9 29.0 21.3 16.5 12.3

24 -- -- 20.7 23.0 25.5 31.7 29.5 28.5 29.0 20.8 16.7 13.0

25 -- -- 20.9 24.1 25.4 31.2 29.9 28.6 29.1 20.3 16.7 12.7

26 -- -- 21.2 24.5 25.4 31.4 29.9 29.1 29.1 20.0 16.4 12.0

27 -- -- 21.3 24.3 25.8 31.5 29.8 29.0 29.1 19.8 15.4 11.8

28 -- -- 21.6 23.9 26.1 31.6 29.7 28.9 29.4 19.7 15.2 11.3

29 -- -- 20.4 23.8 26.8 -- 29.9 29.1 29.0 20.1 15.2 10.7

30 -- -- 19.8 24.2 26.8 31.6 30.1 29.2 27.6 20.8 15.5 10.4

31 -- -- 20.2 26.9 30.1 28.9 20.6 10.9

Mean -- -- -- 20.9 25.8 -- 30.5 29.8 28.3 24.1 17.9 12.5

Maximum -- -- -- 24.5 27.9 -- 32.1 30.8 29.4 28.2 19.9 15

Minimum -- -- -- 17.4 23.1 -- 29.4 28.5 27.1 19.7 15.2 10.4
Table 3 41

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.—Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

295311089445100—Mississippi River-Gulf Outlet near mile 46 near Yscloskey, La. (20-foot depth)

1 13.2 14.9 20.0 23.7 26.8 31.2 29.6 28.4 27.2 19.4 14.8

2 13.1 12.9 19.9 24.0 27.0 31.1 29.9 28.4 27.2 19.5 14.4

3 12.7 12.8 19.5 24.3 27.5 31.4 29.8 28.3 26.8 19.4 14.1

4 12.2 12.5 19.7 24.8 27.5 31.7 29.7 28.2 26.5 19.3 13.5

5 11.2 12.7 20.3 25.2 27.1 31.8 29.6 28.2 26.5 19.2 12.2

6 11.2 13.3 19.9 25.0 26.6 31.3 29.7 28.2 26.5 19.1 11.7

7 11.6 14.5 18.0 25.4 26.6 30.4 29.9 28.1 26.5 19.2 11.6

8 12.3 15.5 17.1 25.5 26.6 29.8 30.1 28.2 26.7 19.6 12.3

9 13.1 16.3 16.7 25.5 26.7 29.4 30.3 28.2 27.5 19.4 13.2

10 14.4 16.7 17.3 25.8 26.9 29.1 30.2 28.2 27.6 19.1 13.7

11 15.6 17.5 17.9 25.9 27.4 29.3 30.2 27.8 26.7 18.7 12.5

12 15.7 17.3 19.2 26.2 28.3 29.6 30.2 27.0 26.3 18.1 11.2

13 15.9 17.2 19.7 26.2 28.9 29.8 29.8 26.6 26.2 17.8 11.1

14 16.2 18.3 20.3 26.4 29.2 30.1 30.1 26.7 25.9 17.9 11.3

15 16.3 18.9 19.9 26.8 29.3 30.5 30.1 26.7 26.1 17.9 12.0

16 16.5 18.6 20.1 27.0 29.5 30.6 30.0 26.8 26.6 18.0 13.1

17 15.9 18.9 20.3 27.1 29.9 30.3 29.7 26.8 24.0 17.9 12.8

18 16.2 19.2 20.4 24.9 30.1 29.8 29.7 27.0 21.5 17.3 12.0

19 16.6 19.9 20.6 23.2 30.6 29.7 29.7 27.1 20.4 16.9 11.9

20 15.3 20.4 21.0 22.7 30.8 29.6 29.7 27.2 20.0 16.6 11.4

21 15.5 20.3 21.1 23.1 31.2 29.3 29.6 27.5 20.4 16.6 11.4

22 14.5 20.4 21.2 23.6 31.2 29.1 29.2 28.2 20.7 16.4 11.6

23 13.4 20.4 21.3 24.1 31.2 29.1 29.2 28.5 21.0 16.3 12.0

24 10.9 13.3 20.4 21.9 24.7 31.2 29.1 28.8 28.6 20.6 16.4 12.8

25 11.4 13.8 20.3 22.8 24.6 31.1 29.1 29.2 28.8 20.2 16.4 12.5

26 11.6 14.3 20.9 23.6 24.8 31.0 29.1 29.1 28.8 19.9 16.2 11.7

27 12.0 15.5 21.3 24.0 25.1 31.0 29.3 28.7 28.8 19.5 15.2 11.5

28 13.2 15.7 21.3 23.6 25.4 31.1 29.4 28.8 28.9 19.9 15.0 11.1

29 13.4 20.2 23.4 25.9 31.4 29.4 28.7 28.5 19.9 14.8 10.3

30 12.7 19.8 23.6 26.4 31.3 29.5 28.9 27.4 20.6 14.9 10.2

31 12.9 19.9 26.6 29.4 28.9 20.3 10.6

Mean -- 14.3 17.9 20.5 25.2 29.2 29.9 29.6 27.9 23.7 17.6 12.1

Maximum -- 16.6 21.3 24 27.1 31.4 31.8 30.3 28.9 27.6 19.6 14.8

Minimum -- 11.2 12.5 16.7 22.7 26.6 29.1 28.7 26.6 19.5 14.8 10.2
42 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.—Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

300018089551200—Mississippi River-Gulf Outlet near mile 59 near Michoud, La. (10-foot depth)

1 15.0 12.7 15.1 20.1 24.8 27.8 32.0 30.0 29.5 28.3 21.4 15.6

2 15.4 13.9 13.8 20.2 25.0 28.1 32.2 30.1 29.1 28.2 20.9 14.9

3 15.5 13.2 12.4 20.0 25.4 28.0 31.8 29.9 29.0 27.9 20.7 15.1

4 16.1 13.1 12.2 20.0 24.6 28.2 31.9 30.4 29.1 27.1 20.6 14.9

5 15.9 12.4 13.0 20.5 24.6 27.0 31.8 30.8 28.9 27.4 20.7 14.3

6 16.6 12.3 13.9 20.2 25.5 26.7 31.3 31.3 29.3 27.4 20.4 13.2

7 16.5 12.8 15.0 19.6 25.6 27.7 30.8 31.6 29.2 27.7 20.3 12.5

8 16.3 13.3 16.1 18.6 -- 28.3 30.6 31.4 29.6 28.3 19.9 13.1

9 16.5 13.8 16.4 18.5 26.9 28.6 30.5 31.3 29.8 28.7 19.5 14.4

10 17.1 14.4 17.4 19.2 26.6 28.7 30.9 31.4 29.4 28.5 19.7 13.7

11 17.1 14.9 18.1 19.5 27.3 28.8 31.5 31.4 28.7 27.7 19.5 13.1

12 15.8 14.8 18.6 19.9 27.8 29.0 31.8 31.3 27.7 27.3 19.4 11.7

13 15.5 15.5 20.0 20.9 28.8 29.1 31.7 31.1 27.6 27.6 19.2 12.3

14 14.8 16.1 20.7 20.4 28.5 29.3 31.7 31.7 27.4 27.8 19.2 13.2

15 14.3 17.3 19.0 20.1 28.5 29.7 31.5 31.6 27.7 27.3 19.2 13.9

16 12.9 16.8 19.1 20.5 28.6 30.0 31.2 31.2 27.7 27.1 19.8 14.0

17 13.3 16.7 19.1 20.8 28.8 30.0 30.7 31.1 28.1 25.6 19.3 13.6

18 13.3 16.3 19.7 20.9 25.9 31.0 30.3 30.8 28.2 24.1 18.7 13.1

19 13.2 16.3 20.5 21.3 24.0 31.3 30.3 31.0 28.2 22.6 18.5 12.9

20 12.7 16.2 21.3 20.8 23.6 31.4 30.4 30.5 28.6 21.7 17.7 12.3

21 11.9 16.0 21.3 21.0 23.7 31.6 30.4 30.3 29.2 20.3 17.3 12.6

22 11.7 16.0 21.3 21.5 23.9 31.3 30.0 29.9 29.8 20.6 16.9 12.5

23 11.8 14.7 21.1 21.7 24.4 31.4 29.7 30.0 29.7 21.4 17.5 12.7

24 12.7 15.5 21.1 22.7 25.0 31.5 29.9 29.5 30.1 21.2 17.7 13.1

25 13.5 15.4 21.4 23.9 25.0 31.9 30.4 29.8 30.1 21.1 17.8 12.7

26 13.6 15.8 21.8 24.3 25.1 32.1 30.2 29.9 29.7 21.0 17.2 12.6

27 14.0 17.3 21.8 24.0 25.5 32.6 29.9 29.9 29.1 20.3 16.6 12.8

28 14.0 17.1 21.7 24.2 26.1 32.2 29.9 29.7 29.0 20.5 16.1 12.9

29 13.9 20.1 24.5 26.7 32.0 29.9 29.8 28.9 20.7 16.1 11.7

30 13.2 19.8 24.5 26.4 31.8 30.1 29.7 28.4 22.5 16.3 11.7

31 12.5 20.5 26.7 30.1 29.4 21.5 11.7

Mean 14.4 15.0 18.5 21.1 -- 29.9 30.8 30.6 28.9 24.8 18.8 13.2

Maximum 17.1 17.3 21.8 24.5 -- 32.6 32.2 31.7 30.1 28.7 21.4 15.6

Minimum 11.7 12.3 12.2 18.5 -- 26.7 29.7 29.4 27.4 20.3 16.1 11.7
Table 3 43

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.—Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

738023321—Inner Harbor Navigation Canal at I-10 at New Orleans, La. (10-foot depth)

1 23.8 27.5 31.7 29.8 29.2 27.8 20.3 15.9

2 24.1 27.1 31.8 29.8 29.0 27.1 20.1 15.4

3 24.2 26.8 31.8 29.9 29.0 27.3 19.9 14.6

4 24.3 26.9 31.8 30.3 29.1 27.4 19.9 14.2

5 24.6 26.8 31.8 30.5 28.9 26.6 20.0 13.1

6 24.9 26.6 31.4 30.8 28.4 26.8 19.9 13.0

7 25.2 26.9 30.8 31.0 28.3 27.3 20.0 13.0

8 25.5 27.0 30.4 31.1 28.5 27.5 20.4 13.5

9 25.8 27.2 30.4 30.9 28.4 27.6 20.2 13.8

10 26.6 27.5 30.6 30.9 28.2 27.3 19.6 13.6

11 27.1 28.0 30.8 31.2 28.0 26.8 19.2 13.2

12 27.3 28.4 30.6 31.0 27.9 26.5 18.8 13.1

13 27.5 28.7 30.8 30.9 27.2 26.5 18.6 12.8

14 27.7 29.1 30.9 30.9 27.3 26.6 18.4 12.5

15 27.5 29.2 31.0 30.9 27.6 26.9 18.6 13.0

16 27.2 29.5 30.9 30.8 27.6 26.6 18.6 13.2

17 27.1 29.9 30.4 30.6 27.7 24.7 18.1 12.9

18 26.7 30.3 30.2 30.3 27.8 23.1 17.7 12.8

19 25.7 30.8 30.1 30.2 27.9 22.8 17.7 12.0

20 24.7 31.0 30.1 30.0 28.0 22.5 17.8 11.9

21 24.9 31.2 29.9 29.7 28.1 22.3 18.0 11.7

22 21.6 24.6 31.4 29.7 29.6 28.3 21.5 17.4 11.7

23 22.5 24.7 31.1 29.4 29.6 28.4 21.6 17.2 12.4

24 22.2 24.9 31.2 29.8 29.4 28.4 21.0 17.3 13.2

25 22.8 25.0 31.5 30.1 29.2 28.5 20.7 17.0 12.4

26 23.3 25.0 31.5 29.9 29.2 28.5 20.4 16.3 11.8

27 23.8 25.5 31.4 29.7 29.2 28.8 20.4 15.6 11.6

28 23.5 26.0 32.0 29.6 29.6 29.1 20.0 15.8 11.2

29 23.5 26.5 -- 29.7 29.9 28.8 20.5 15.8 10.7

30 23.6 26.8 31.5 29.8 29.7 28.2 21.1 15.9 10.7

31 27.6 29.7 29.5 20.8 11.3

Mean -- 25.8 -- 30.5 30.2 28.3 24.4 18.3 12.8

Maximum -- 27.7 -- 31.8 31.2 29.2 27.8 20.4 15.9

Minimum -- 23.8 -- 29.4 29.2 27.2 20 15.6 10.7
44 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 3. Daily mean temperature, in degrees Celsius, for selected sites in the Mississippi River-Gulf Outlet, Lake Borgne, and the Inner 

Harbor Navigation Canal in southeastern Louisiana, January through December 2009.—Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

Feb

ruary

March April May June July August September

OctoberNovemberDecember

295655089495600—Lake Borgne near Mississippi River-Gulf Outlet near Violet, La. (6-foot depth)

1 14.5 -- -- 19.6 24.5 27.7 31.3 29.8 28.1 26.1 20.1 14.5

2 14.7 -- -- 19.8 24.7 27.6 31.4 29.6 27.8 26.3 19.7 14.1

3 15.3 -- -- 19.5 24.7 27.0 31.3 29.6 27.9 26.3 19.5 14.0

4 16.2 -- -- 20.1 24.7 27.1 31.5 29.8 27.9 26.1 19.5 13.3

5 16.8 -- -- 21.1 25.1 26.5 31.4 30.4 27.9 26.3 19.7 12.0

6 16.7 -- -- 19.5 25.3 26.1 31.0 30.6 28.1 26.8 19.4 11.2

7 17.0 -- -- 16.4 25.5 26.6 30.1 30.8 28.3 27.4 19.2 11.1

8 16.6 -- -- 17.1 26.0 27.2 29.8 30.4 28.5 27.7 19.4 12.2

9 16.9 -- -- 17.5 25.9 27.3 29.8 30.5 28.4 27.9 19.4 13.9

10 17.3 -- -- 17.9 26.3 27.8 30.5 30.6 28.0 27.2 19.2 13.3

11 16.8 -- -- 19.0 26.8 28.5 30.9 30.7 27.5 26.0 18.9 11.8

12 14.8 -- 19.7 19.4 27.7 28.8 31.1 30.4 26.7 25.7 18.5 10.9

13 14.3 -- 20.2 19.7 27.8 29.1 31.2 30.1 26.6 26.1 18.4 11.5

14 12.7 -- 19.9 20.4 27.6 29.6 31.1 30.4 26.8 26.5 18.6 12.4

15 13.1 -- 20.1 19.7 27.5 29.7 30.8 30.2 27.2 27.1 18.9 13.7

16 10.6 -- 19.8 20.2 27.6 30.1 30.5 29.7 27.6 26.1 19.3 13.5

17 10.3 -- 19.9 20.3 27.1 30.3 29.9 29.7 27.9 23.3 18.5 12.6

18 11.7 -- 20.5 20.5 24.4 30.6 29.7 29.9 28.2 20.3 17.4 11.8

19 12.2 -- 20.9 20.9 23.2 30.8 29.2 29.9 28.3 18.9 17.2 11.9

20 11.2 -- 21.0 21.0 22.7 31.0 29.3 29.9 28.4 18.7 16.8 11.9

21 9.9 -- 21.1 21.2 23.0 31.1 29.4 29.7 28.8 19.5 16.6 11.8

22 10.4 -- 20.8 21.2 23.4 31.2 29.2 29.6 28.9 20.7 16.4 11.9

23 -- -- 20.7 22.2 24.0 31.4 29.3 28.9 28.7 21.2 16.5 12.4

24 -- -- 20.8 22.6 24.7 31.4 29.8 28.3 28.6 20.2 16.6 13.0

25 -- -- 21.0 23.6 25.0 31.4 30.0 28.4 28.9 19.6 16.7 12.5

26 -- -- 21.1 23.8 25.2 31.3 30.0 28.6 28.9 19.1 16.4 11.7

27 -- -- 21.2 23.6 25.5 31.4 29.5 28.7 29.0 19.0 15.7 11.7

28 -- -- 21.3 23.3 26.1 31.6 29.2 28.8 29.1 19.1 15.3 11.4

29 -- -- 19.6 23.7 26.4 -- 29.3 29.2 28.1 19.8 15.3 10.7

30 -- -- 19.4 24.2 26.7 31.2 29.6 29.2 26.5 21.6 15.5 10.6

31 -- -- 19.7 27.2 29.6 28.8 21 10.9

Mean -- -- -- 20.6 25.6 -- 30.2 29.7 28.1 23.5 18.0 12.3

Maximum -- -- -- 24.2 27.8 -- 31.5 30.8 29.1 27.9 20.1 14.5

Minimum -- -- -- 16.4 22.7 -- 29.2 28.3 26.5 18.7 15.3 10.6
Table 4 45

Table 4

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009.

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

294900089350800—Mississippi River-Gulf Outlet near mile 35 near Hopedale, La. (10-foot depth)

1 18,100 17,800 -- -- 36,800 32,600 -- 31,400

2 17,100 17,500 -- -- 38,100 31,900 -- 30,200

3 17,000 17,400 -- -- 38,500 32,100 -- 31,400

4 17,700 20,000 -- -- -- 31,600 -- 29,900

5 21,600 24,000 -- -- -- 31,400 -- 31,200

6 20,100 25,100 -- -- -- 31,500 -- 29,300

7 18,200 24,800 -- 43,700 -- 31,100 26,800 26,600

8 -- 23,600 -- 41,300 32,900 29,400 26,200 24,100

9 -- 22,100 42,100 40,500 30,700 27,400 27,100 26,400

10 -- 24,200 40,700 39,700 -- -- 24,800 28,900

11 -- 26,800 39,800 37,400 -- 30,700 32,200 27,100

12 -- 28,700 39,900 39,800 -- 29,600 33,100 24,700

13 -- 29,300 41,400 42,100 -- -- 31,500 23,400

14 -- 31,200 41,400 39,300 -- -- 31,700 27,600

15 -- 36,200 -- 38,200 -- -- 32,300 25,600

16 -- 39,500 -- 37,700 31,500 -- 29,800 30,700

17 -- 42,100 -- 36,400 -- -- 30,600 21,500

18 -- 44,200 -- 35,200 -- -- 31,400 19,900

19 17,400 45,200 -- 34,000 -- -- 30,800 23,400

20 14,000 45,600 -- 33,600 -- -- 29,700 24,300

21 16,100 46,000 -- -- -- 29,200 29,000 23,200

22 18,500 17,700 46,200 -- -- -- 28,600 30,000 21,000

23 17,000 17,700 46,300 -- -- -- 27,400 30,400 20,400

24 17,900 15,400 46,200 38,400 37,100 29,900 27,100 29,000 20,600

25 18,900 14,700 46,000 -- 35,700 28,000 27,500 29,300 20,300

26 19,100 14,300 45,200 39,700 -- 27,800 26,700 31,100 20,900

27 19,300 14,700 44,600 -- -- 30,700 26,300 31,900 20,900

28 19,000 16,000 44,000 -- -- -- 27,200 31,600 22,700

29 18,400 16,600 -- -- -- 35,200 26,400 31,000 21,400

30 18,500 17,000 -- -- -- 33,700 25,900 31,800 19,700

31 18,600 -- -- 25,500 19,900

Mean -- -- -- -- -- -- -- -- 24,800

Maximum -- -- -- -- -- -- -- -- 31,400

Minimum -- -- -- -- -- -- -- -- 19,700
46 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009—

Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

295311089445100—Mississippi River-Gulf Outlet near mile 46 near Yscloskey, La. (10-foot depth)

1 18,400 -- -- 13,000 12,200 12,100 13,400 15,100 16,400 16,600 14,500 13,100

2 18,300 -- -- 13,200 11,700 12,100 13,400 15,200 16,500 16,700 14,000 13,000

3 18,600 -- -- 12,500 12,500 12,200 13,500 14,900 16,800 16,600 14,000 13,000

4 18,400 -- -- 12,300 12,500 12,200 13,500 15,000 17,100 16,600 13,900 12,500

5 18,300 -- -- 12,000 15,800 12,400 13,600 15,000 17,100 16,600 13,900 12,700

6 20,100 -- -- 11,500 20,100 12,500 13,700 14,900 17,200 16,400 14,000 12,600

7 21,500 -- -- 10,600 18,100 13,000 13,700 15,000 17,300 16,200 14,300 12,400

8 22,200 -- -- 12,500 19,400 13,000 13,600 15,200 17,200 15,900 14,200 12,100

9 22,600 -- -- 18,100 21,000 12,900 13,400 15,500 17,200 15,800 14,000 11,800

10 24,200 -- -- 20,300 20,100 12,900 14,100 15,700 17,200 15,500 15,700 10,700

11 21,500 -- -- 20,000 19,500 12,700 14,100 15,700 17,100 15,500 15,900 10,800

12 20,700 -- 19,200 20,800 17,800 12,900 14,100 15,600 17,100 15,400 15,700 11,100

13 20,200 -- 17,600 19,700 18,400 12,900 14,500 15,500 17,500 15,400 15,600 10,700

14 17,200 -- 16,900 15,800 18,500 12,800 14,100 15,700 17,300 15,200 15,100 10,200

15 16,800 -- 16,400 14,700 15,100 12,600 14,200 15,900 17,200 15,200 14,700 9,060

16 16,100 -- 17,100 14,300 14,100 12,400 14,200 16,100 17,200 14,900 14,100 7,730

17 15,200 -- 17,900 15,200 13,000 12,400 14,200 16,200 17,200 14,700 14,600 7,590

18 15,000 -- 18,600 15,100 12,700 12,200 14,100 16,300 17,200 15,000 14,800 8,130

19 15,900 -- 19,500 13,900 12,600 12,100 14,400 16,200 17,100 15,000 14,700 8,590

20 16,900 -- 18,200 12,600 12,600 12,400 14,700 16,100 17,000 15,000 14,500 7,910

21 17,400 -- 16,700 12,400 12,700 12,600 14,800 16,000 17,300 14,800 14,300 7,150

22 20,500 -- 17,300 12,100 12,800 12,600 14,800 15,600 17,200 14,600 13,900 6,730

23 -- -- 18,700 13,100 12,800 12,900 14,900 14,900 17,200 14,800 13,800 6,590

24 -- -- 16,300 16,100 12,500 13,300 15,300 15,000 17,300 15,200 13,400 6,680

25 -- -- 16,800 16,900 12,400 13,900 15,100 15,400 17,300 15,000 13,300 7,280

26 -- -- 19,700 17,800 12,200 13,900 14,800 16,200 17,200 14,900 13,300 7,350

27 -- -- 19,700 19,200 12,200 13,800 15,000 16,100 16,900 14,700 13,200 7,320

28 -- -- 18,700 15,000 12,600 13,700 14,700 16,200 16,700 14,700 13,000 7,450

29 -- -- 13,900 12,600 12,500 -- 14,900 16,400 16,200 14,500 12,900 7,490

30 -- -- 13,300 12,500 12,300 13,200 15,200 16,700 16,300 14,300 12,900 7,200

31 -- -- 13,300 12,000 15,400 16,400 14,500 7,270

Mean -- -- -- 14,900 14,800 -- 14,300 15,600 17,100 15,400 14,200 24,800

Maximum -- -- -- 20,800 21,000 -- 15,300 16,700 17,500 16,700 15,900 31,400

Minimum -- -- -- 10,600 11,700 -- 13,400 14,900 16,200 14,300 12,900 19,700
Table 4 47

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009—

Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

295311089445100—Mississippi River-Gulf Outlet near mile 46 near Yscloskey, La. (20-foot depth)

1 26,700 12,600 13,100 13,000 18,700 14,900 17,400 17,200 17,400 14,800 13,400

2 24,200 13,300 13,400 13,300 18,400 14,900 16,700 17,700 17,700 15,200 13,500

3 21,000 16,800 12,600 15,400 17,800 14,300 16,200 -- 17,400 15,700 13,500

4 20,100 19,100 12,300 16,300 17,600 14,900 17,000 -- 16,600 15,700 13,100

5 18,300 19,300 12,000 18,800 13,200 14,200 17,000 17,700 16,900 15,300 12,900

6 18,300 19,600 11,400 22,900 13,300 13,800 -- 18,000 17,100 14,500 12,800

7 18,400 20,200 10,400 23,500 14,000 14,200 17,200 17,600 16,900 14,700 12,700

8 19,100 21,000 13,400 24,100 13,600 14,600 16,300 17,600 16,800 14,600 12,400

9 19,700 21,200 18,900 26,400 13,300 14,700 17,000 17,600 16,200 14,400 12,300

10 21,800 21,500 20,000 26,700 13,200 15,600 16,900 17,600 15,800 16,100 11,600

11 23,500 22,300 19,900 27,300 13,100 15,500 17,300 17,400 15,700 16,000 11,100

12 22,100 25,500 20,800 27,800 13,700 16,200 16,700 17,300 15,900 15,800 11,400

13 22,500 26,400 21,300 28,100 13,800 17,000 15,900 18,200 16,200 15,800 11,100

14 20,500 22,400 16,500 27,500 14,000 15,200 16,900 17,700 16,100 16,100 11,100

15 20,600 21,800 14,900 25,300 14,100 15,400 16,900 18,000 16,200 16,300 10,400

16 17,500 26,800 14,700 24,000 14,000 16,200 17,400 18,100 15,300 15,900 9,520

17 16,000 26,100 14,800 20,800 14,100 15,800 19,000 18,200 14,700 14,900 8,100

18 16,200 27,100 14,600 12,500 14,600 15,200 20,700 18,500 15,000 15,200 8,570

19 17,400 25,400 13,600 12,000 15,000 16,600 19,900 18,500 15,200 15,200 9,050

20 16,300 21,000 12,100 12,100 15,400 17,700 19,900 18,400 15,300 14,800 8,630

21 19,500 19,900 12,300 13,200 16,000 17,400 18,100 18,100 14,900 14,500 8,860

22 16,600 19,200 13,100 13,000 16,000 17,600 17,500 18,100 14,600 14,500 9,330

23 14,600 20,200 17,400 13,600 15,700 17,500 18,300 17,800 15,100 14,700 7,200

24 23,700 13,700 16,400 21,300 12,500 14,700 17,200 17,600 17,400 15,300 14,100 6,820

25 22,800 13,100 19,000 20,400 13,100 16,000 17,000 17,200 17,400 15,400 13,900 7,600

26 23,100 13,500 22,100 19,300 12,900 16,700 16,600 17,700 17,400 15,000 13,700 7,810

27 23,400 15,400 23,300 18,600 13,000 15,800 16,100 -- 17,300 14,700 13,600 7,970

28 22,600 16,000 22,100 16,600 14,300 14,800 16,500 -- 17,200 15,600 14,200 7,760

29 19,800 14,800 13,700 16,900 14,000 17,100 18,300 16,500 14,400 14,700 7,830

30 17,500 14,200 13,200 19,300 14,000 17,300 17,900 16,700 14,200 14,500 7,780

31 20,700 13,900 20,300 17,800 17,900 14,600 8,240

Mean -- 18,700 20,500 15,600 18,700 15,000 16,000 -- -- 15,800 15,000 10,100

Maximum -- 26,700 27,100 21,300 28,100 18,700 17,800 -- -- 17,700 16,300 13,500

Minimum -- 13,100 12,600 10,400 12,000 13,100 13,800 -- -- 14,200 13,600 6,820
48 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009—

Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

300018089551200—Miss River Gulf Outlet near mile 59 near Michoud, La. (10-foot depth)

1 16,500 15,500 10,500 11,200 9,150 10,800 13,300 13,500 14,800 14,500 12,300 12,400

2 16,500 16,500 10,400 11,400 8,850 11,200 13,500 13,300 14,900 14,500 12,600 12,500

3 15,500 17,200 11,900 10,700 8,690 11,500 13,200 13,300 15,500 14,300 12,800 11,500

4 14,600 17,300 12,400 10,600 8,420 12,200 13,100 13,800 16,100 14,900 12,800 11,700

5 14,700 17,100 12,900 10,600 8,340 12,900 12,800 14,000 16,700 14,400 12,900 11,700

6 15,900 16,800 13,600 9,490 8,720 12,800 12,600 14,300 16,300 13,700 13,000 11,800

7 16,800 16,700 14,100 9,090 9,570 13,100 12,500 14,700 15,300 13,400 13,100 11,900

8 16,500 16,500 14,400 9,110 -- 12,700 13,000 15,300 15,000 13,100 13,200 11,700

9 17,000 16,500 14,200 9,670 11,200 12,400 13,400 15,500 14,800 13,100 13,800 10,000

10 17,400 16,600 14,600 10,900 12,300 12,200 13,800 14,600 14,700 13,100 13,400 8,590

11 17,900 16,700 14,300 12,500 13,400 11,900 13,900 14,300 14,500 13,500 12,400 10,700

12 17,500 15,200 14,500 13,800 14,000 11,700 13,900 14,200 15,500 13,700 12,000 11,100

13 17,800 15,300 15,100 13,200 14,200 11,400 13,700 13,900 15,500 13,400 11,900 9,750

14 16,400 15,100 14,800 12,300 13,300 11,300 13,500 14,300 13,500 13,400 12,300 8,240

15 15,300 14,700 14,000 11,500 13,700 11,400 13,700 14,800 13,200 12,700 12,600 7,380

16 15,700 14,800 14,400 11,800 13,500 11,400 13,700 15,400 13,200 12,000 12,500 6,950

17 15,800 14,900 15,400 12,200 13,400 11,600 13,600 15,700 13,500 12,900 12,200 6,930

18 15,200 14,300 15,700 11,900 12,700 12,000 13,600 15,400 14,000 13,100 12,400 7,100

19 14,800 13,200 16,200 11,000 12,300 12,400 13,300 15,100 13,900 13,300 12,500 6,670

20 15,100 13,600 16,400 9,370 12,300 12,600 13,900 15,000 14,100 13,600 12,600 6,140

21 15,700 13,700 15,900 9,250 12,300 12,600 14,100 14,600 14,300 13,800 13,100 6,200

22 16,300 13,900 15,600 9,320 12,100 12,400 14,100 13,600 14,700 14,000 13,100 6,050

23 17,600 14,300 15,400 8,950 11,900 12,300 14,000 13,900 15,000 13,800 12,900 6,230

24 17,900 14,100 14,900 9,300 12,500 12,700 14,000 14,300 15,100 13,100 12,700 6,860

25 18,200 13,700 14,500 9,570 11,600 13,000 14,000 14,500 15,200 13,200 12,300 6,820

26 17,900 13,500 13,900 9,980 11,100 13,100 13,400 14,500 15,000 13,300 11,200 6,640

27 17,200 13,300 13,000 10,100 10,700 13,200 13,000 14,700 14,100 13,500 10,700 6,740

28 17,400 12,500 13,100 9,860 10,600 12,900 13,100 15,300 13,300 13,100 10,900 6,780

29 16,900 11,200 9,650 10,800 12,300 13,200 15,500 13,300 13,400 11,800 6,730

30 16,400 11,200 9,450 10,600 12,900 13,500 14,500 14,200 13,300 11,900 6,650

31 15,300 11,300 10,800 13,600 14,200 12,400 6,840

Mean 16,400 15,100 13,900 10,600 -- 12,200 13,500 14,500 14,600 13,500 12,500 8,600

Maximum 18,200 17,300 16,400 13,800 -- 13,200 14,100 15,700 16,700 14,900 13,800 12,500

Minimum 14,600 12,500 10,400 8,950 -- 10,800 12,500 13,300 13,200 12,000 10,700 6,050
Table 4 49

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009—

Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

0738023321—Industrial Canal1

 at I-10 at New Orleans, La. (10-foot depth)

1 8,320 10,000 11,600 10,300 13,100 13,900 10,600 11,000

2 8,300 10,800 10,900 10,600 13,300 13,800 10,600 11,100

3 8,360 10,700 10,600 10,800 14,400 13,900 10,700 10,200

4 8,540 10,700 10,700 11,100 14,600 14,300 10,800 10,100

5 8,640 10,900 10,700 11,200 14,300 12,900 10,900 9,560

6 9,030 11,500 10,400 11,100 12,500 13,000 10,900 9,460

7 9,560 11,000 11,600 12,300 11,900 13,100 11,100 9,690

8 10,500 10,900 11,800 13,100 12,500 13,000 11,500 9,020

9 11,200 10,700 12,400 10,700 12,300 12,900 12,200 7,480

10 11,600 10,500 12,400 10,300 12,100 12,800 12,000 6,920

11 12,000 10,200 12,500 10,600 12,300 12,600 11,000 7,990

12 12,300 9,880 11,700 11,100 13,400 12,400 11,000 9,320

13 12,900 9,780 10,900 10,900 11,400 12,100 10,900 7,740

14 13,400 9,720 11,700 11,400 11,500 12,000 11,300 7,930

15 11,100 10,200 11,900 11,700 11,300 11,300 11,300 7,630

16 11,000 10,400 11,100 12,000 12,400 11,100 11,400 6,970

17 12,100 10,700 10,900 11,300 13,900 11,000 11,300 6,950

18 13,800 10,900 10,300 11,100 13,800 10,600 11,100 6,650

19 13,100 10,500 10,500 11,800 14,500 11,100 11,000 6,580

20 11,500 10,400 10,700 11,400 14,600 11,600 11,200 6,180

21 12,100 10,100 11,100 10,800 14,700 12,000 11,800 6,160

22 8,370 12,100 9,720 11,100 11,400 15,000 12,400 11,500 6,250

23 7,990 12,000 9,650 10,300 11,600 14,700 11,900 10,800 6,010

24 8,630 10,400 9,980 10,200 11,500 13,900 11,100 10,700 5,970

25 9,130 10,000 11,300 10,200 10,900 13,700 11,000 10,200 6,620

26 9,350 9,680 11,300 9,410 11,200 13,200 10,900 9,670 6,730

27 9,620 9,410 10,300 9,860 11,600 12,800 11,000 9,550 6,760

28 8,860 9,330 9,200 10,500 12,300 12,800 10,700 9,740 6,760

29 8,850 9,270 -- 10,300 11,900 13,500 10,900 10,200 6,660

30 8,560 9,240 13,100 10,700 11,900 13,900 10,900 10,400 6,540

31 -- 9,260 -- 10,600 12,700 10,700 6,370

Mean -- 10,600 -- 11,000 11,400 13,300 12,000 10,900 7,700

Maximum -- 13,800 -- 12,500 13,100 15,000 14,300 12,200 11,100

Minimum -- 8,300 -- 9,410 10,300 11,300 10,600 9,550 5,970
50 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 4. Daily mean specific conductance, in microsiemens per centimeter at 25 degrees Celsius, for selected sites in the Mississippi 

River-Gulf Outlet, Lake Borgne, and the Inner Harbor Navigation Canal in southeastern Louisiana, January through December 2009—

Continued 

[see figure 1 for site location; --, no data. Rock barrier construction started in February 2009 and extended above the water surface of the entire channel width on 

June 4, 2009]

Day January

February

March April May June July August September

OctoberNovemberDecember

295655089495600—Lake Borgne near Mississippi River-Gulf Outlet near Violet, La. (6-foot depth)

1 18,800 -- -- 13,500 10,300 13,400 14,300 15,100 16,400 16,300 13,600 12,200

2 18,200 -- -- 12,800 10,000 13,500 14,300 15,300 16,400 15,800 13,700 11,200

3 18,100 -- -- 12,900 10,600 13,500 14,800 15,200 17,000 15,900 13,500 12,100

4 19,400 -- -- 12,400 11,000 13,800 14,600 15,100 17,700 16,100 13,400 12,400

5 17,900 -- -- 12,300 12,400 14,200 14,700 15,100 17,500 15,400 13,600 11,900

6 24,100 -- -- 12,000 15,300 13,100 14,500 15,200 17,600 15,100 13,600 12,200

7 21,900 -- -- 11,200 16,300 12,600 14,700 15,500 17,200 14,900 13,500 11,700

8 22,100 -- -- 10,500 16,100 12,500 14,900 16,500 17,400 15,000 12,800 11,500

9 18,200 -- -- 14,400 18,400 12,300 15,000 16,400 17,200 14,500 12,000 11,200

10 20,500 -- -- 18,100 18,400 12,000 14,700 16,400 17,500 14,100 11,900 11,400

11 15,900 -- 15,400 15,600 16,400 12,100 14,900 16,600 16,900 14,700 11,900 11,200

12 15,600 -- 15,300 14,500 14,900 12,400 15,300 16,200 16,800 15,500 12,100 10,400

13 16,500 -- 16,200 16,500 13,900 12,700 15,500 16,100 17,000 15,400 13,500 9,870

14 14,900 -- 15,000 13,400 14,100 12,400 15,200 16,200 17,100 15,400 14,300 9,210

15 16,200 -- 16,800 12,400 13,800 12,500 15,000 16,200 17,100 15,300 14,100 8,030

16 14,500 -- 15,700 12,500 13,200 12,700 14,800 16,100 18,400 15,200 14,000 7,740

17 13,600 -- 16,400 12,300 11,900 12,800 14,900 16,400 19,000 15,100 14,100 8,280

18 15,400 -- 16,000 11,800 12,600 13,000 15,000 16,200 18,200 14,200 14,200 7,990

19 15,900 -- 15,600 11,700 12,400 13,400 14,800 16,400 17,700 14,100 14,300 7,030

20 15,300 -- 14,000 11,400 12,600 14,100 14,700 16,400 17,400 14,500 13,800 6,890

21 15,600 -- 15,700 10,300 11,700 14,400 14,900 15,900 17,200 14,800 13,200 7,180

22 20,400 -- 15,800 10,300 11,500 14,900 15,100 15,900 16,900 15,600 12,800 6,970

23 -- -- 14,400 10,400 11,900 15,100 15,400 15,600 16,700 15,600 13,200 6,950

24 -- -- 15,200 11,300 13,200 15,000 15,500 15,700 16,500 14,600 13,000 7,710

25 -- -- 16,400 11,300 12,900 14,300 15,700 16,500 16,300 15,000 13,300 6,820

26 -- -- 16,900 10,500 12,300 14,200 15,000 16,700 16,100 15,000 14,000 6,870

27 -- -- 17,000 10,900 12,200 14,500 15,100 16,600 15,900 14,600 13,700 6,880

28 -- -- 14,100 11,200 12,100 14,000 15,000 17,000 15,900 14,400 13,700 7,070

29 -- -- 14,200 11,200 12,300 -- 14,600 17,100 15,300 14,300 13,500 7,120

30 -- -- 13,600 10,500 12,700 14,500 14,600 16,700 15,500 14,400 13,200 7,280

31 -- -- -- 13,000 14,600 16,500 13,900 7,140

Mean -- -- -- 12,300 13,200 -- 14,900 16,100 17,000 15,000 13,400 9,100

Maximum -- -- -- 18,100 18,400 -- 15,700 17,100 19,000 16,300 14,300 12,400

Minimum -- -- -- 10,300 10,000 -- 14,300 15,100 15,300 13,900 11,900 6,820

1

Referred to in text as Inner Harbor Navigation Canal.
Table 5 51

Table 5

Table 5. Grain-size distribution and loss on ignition for bed sediment collected at selected sites in the Mississippi River-Gulf Outlet 

(MRGO) in southeastern Louisiana, June 10, 2009.

Grain 

size 

(millimeters)

294608089310500 

– MRGO near 

mile 30 near 

Hopedale, La.

294805089335200 

– MRGO near 

mile 34 near 

Hopedale, La.

294946089361900 

– MRGO near 

mile 37 near 

Hopedale, La.

295157089423200 

– MRGO near 

mile 44 near 

Yscloskey, La.

295556089494400 

– MRGO near 

mile 52 near 

Violet, La.

295709089511200 

– MRGO near 

mile 54 near 

Violet, La.

300018089551200 

– MRGO near 

mile 59 near 

Michoud, La.

Percent of sample smaller than or equal to grain size 

1.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0

.5 100.0 100.0 100.0 100.0 100.0 100.0 100.0

.35 100.0 100.0 100.0 100.0 100.0 100.0 100.0

.25 100.0 100.0 100.0 100.0 100.0 100.0 100.0

.177 98.2 99.4 98.8 100.0 100.0 100.0 100.0

.125 94.6 96.4 94.4 100.0 100.0 100.0 100.0

.088 94.4 96.4 94.4 100.0 100.0 100.0 100.0

.074 94.4 96.4 94.4 100.0 100.0 100.0 100.0

.062 94.4 96.4 94.4 100.0 100.0 100.0 100.0

.07042 64.8 81.7 84.2 82.0 56.5 62.9 53.0

.05690 62.5 78.5 81.7 78.5 53.0 59.0 50.1

.04895 60.0 76.3 80.4 74.0 50.4 57.1 46.9

.03486 53.0 66.7 75.3 66.4 43.4 51.7 39.6

.02198 43.7 54.9 67.0 55.8 34.1 43.4 32.2

.01275 34.1 44.0 57.1 45.0 25.8 34.1 24.9

.00743 27.1 34.8 46.6 36.1 21.1 28.7 19.5

.00636 25.5 33.2 44.0 35.4 19.8 27.8 18.5

.00530 22.7 29.7 41.2 32.2 18.8 27.4 16.3

.00453 21.7 28.4 38.9 30.6 17.1 25.5 15.3

.00135 12.1 15.6 23.0 15.0 8.0 15.0 8.6

Loss on ignition (milligrams per kilogram)

79,000 85,000 64,000 98,000 134,000 134,000 143,000
52 Water-Quality, Bed-Sediment, and Discharge Data for the Mississippi River-Gulf Outlet and Adjacent Waterways

Table 6

Table 6. Instantaneous discharge at selected sites in the Mississippi River-Gulf Outlet (MRGO) in southeastern Louisiana on March 9 

and June 17, 2009.

[--, no data; positive values indicate flow towards the Gulf of Mexico. Rock barrier construction started in February 2009 and extended above the water surface 

of the entire channel width on June 4, 2009]

Station

Time 

(hours:minutes)

Area 

(square feet)

Velocity

(feet per second)

Discharge

(cubic feet per second)

3/9/09 6/17/09 3/9/09 6/17/09 3/9/09 6/17/09 3/9/09 6/17/09

MRGO near mile 30 

near Hopedale, La.

10:29 12:05 31,600 33,100 0.264 0.144 8,340 4,730

MRGO near mile 34 

near Hopedale, La.

12:27 12:44 29,400 33,300 .113 .039 -3,320 1,260

MRGO near mile 37 

near Hopedale, La.

12:54 14:12 29,100 28,000 .335 .121 -9,800 3,370

MRGO near mile 44 

near Yscloskey, La.

13:28 14:43 25,500 26,600 .225 .082 -5,760 2,150

MRGO near mile 52 

near Violet, La.

14:36 15:17 25,100 26,500 .325 .187 -8,150 -5,010

MRGO near mile 54 

near Violet, La.

15:25 15:47 30,900 29,600 .080 .046 -2,500 -1,330

MRGO near mile 59 

near Michoud, La.

08:57 16:18 28,100 27,900 .618 .207 16,800 -5,760

MRGO near mile 59 

near Michoud, La.

16:02 -- 27,700 -- .094 -- 2,650 --

Lake Borgne at MRGO 

near Violet, La.

15:03 15:37 9,450 10,100 1.050 .801 9,880 8,050

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