Sabine River Authority of Texas

To: Interested Parties

From: Environmental Services division

RE: february 2001 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Summary for February 2001. Water quality sampling was performed February 13th through February 14th. The Upper Basin received 5.31-5.28 inches of rainfall during the 35days since the previous sample run, as recorded at Lake Tawakoni and Lake Fork. Toledo Bend and Orange received 6.84 and 4.57inches respectively during the 35 days preceding the sample run. There was a cool front four days prior to the sample run. Daytime temperatures prior to the cold front were in the 70's throughout the Basin and after the front, highs were reported in the 40's for most of the Basin except Orange where daytime highs only dropped into the 50's. Lows were in the 50's to 20's in the Upper Basin and in the 60's to 30's in Orange. Some parameters were influenced by a 0.35-0.62 inch rainfall at Toledo Bend and the Upper Basin one day prior to the sample run. Temperature and dissolved oxygen profiles indicate the reservoirs are not thermally stratified and will continue to mix until extended periods of warm weather.

Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni

For the February sample run, most of the parameter's values seen at the Upper Basin sites were consistent with water of high quality. Bacteriological counts were high at most river sites, not unusual after a significant rain. Streptococcal counts indicate sources are likely non-human. Lake Fork and Lake Tawakoni reservoirs were completely mixed. LT23D had elevated nitrate/nitrite and orthophosphate and LF3 had elevated orthophosphate. Stream standards do not exist for nitrogen and phosphorus compounds so statewide screening criteria are used for comparison.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

February WQM sampling results were indicative of water of high quality at most sites. Toledo Bend Reservoir levels were near pool level at the time samples were taken. Deep-water stations sampled on the reservoir were well mixed and did exhibit weak thermal stratification. Station TB6S had a level of sulfate that exceeded stream standards set for Toledo Bend Reservoir. The Tenaha Creek site, TNHO1, had high bacteriological counts and elevated nitrate/nitrite. This site was experiencing heavy flooding and is also downstream of several wastewater treatment facilities. Station BA4 had higher conductivity readings than corresponding river sites and levels of sulfate that exceeded standards set for Sabine River. Station BA4 is sampled from a bayou that receives discharge from a paper mill.

Tidal Section of the Sabine Basin below Morgan Bluff

Stations sampled in the tidal portion of the Sabine Basin had values that were consistent with water of high quality at most sites. Salinity was not detected at any tidal site. The greatest salinity reading of 3 ppt was observed at a depth of 9.2 meters at Station SRT1. Deep-water stations sampled did not exhibit thermal stratification or a saltwater wedge.



This Report and additional data for these monitoring stations are available on our World Wide Web site ( If you have any questions or comments concerning this report, please contact:


       Upper Sabine Basin
John Payne, Upper Basin Field Office Coordinator
903-878-2420 (

       Lower and Tidal Sabine Basin
Cynthia Darbonne, Lower Basin Field Office Coordinator
409-746-3284 (

       If above are unavailable
Miles Hall, Environmental Services Assistant Division Manager
409-746-2192 (


Printed Thursday, March 29, 2001