Sabine River Authority of Texas

To: Interested Parties

From: Environmental Services division

RE: march 2000 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Summary for March 2000.  Water quality sampling was performed March 28 through March 30.  Daytime high air temperatures during the seven days prior to the sampling dates were mostly in the 70s and 80s in the Upper Basin and in the 60s and 70s in the Lower Basin.  Nighttime lows in the Upper Basin were mostly in the 50s and 60s. Low temperatures in the Lower Basin were mostly in the 50s with a few nights in the 30s just prior to the sample run.  A number of small rainfall events were recorded throughout the watershed during March.

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

For the March sample run, most of the water quality values seen at the Upper Basin sites were consistent with water of high quality.  The most recent precipitation was about a quarter inch of rain three days prior to sampling. Water temperature and dissolved oxygen profiles gradually increased from bottom to surface at Lake Tawakoni and Lake Fork, indicating weak thermal stratification. Most of the reservoir sites and one river site (SR19) had dissolved oxygen values in excess of 100%. Fecal coliform levels were slightly elevated at three river sites.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

March WQM sampling results were indicative of high water quality at most sites. Profiles taken at deep-water stations on the reservoir did not exhibit thermal stratification. Stations TB6N, TB6M, TB6L, TB6I, TB8 and BA4 had fecal counts above stream standards. Corresponding high strepococcus counts were detected at sites BA4 and TB6N. A significant rainfall a few days prior to the sampling event likely contributed to the elevated fecal counts. Compared to other sites analyzed during this sampling event, higher sulfate, chloride, TOC, and nitrate/nitrite levels were observed at Station BA4. 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. All values measured were within stream standards criteria. Salinity was detected at all four tidal stations: SRT1, SRT2, BB1 and ICW1. The greatest salinity reading observed was 18 ppt at Station SRT1. A definite salt-water wedge was detected at all tidal sites with no thermal stratification.



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,
Assistant Division Manager Environmental Services
409-746-3284 (



Printed Monday, September 18, 2000