Sabine River Authority of Texas

To: Interested Parties

From: Environmental Services division

RE: april 2000 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Summary for April 2000.  Water quality sampling was performed April 11 through April 13.  Daytime high air temperatures during the seven days prior to the sampling dates ranged from 60 to 84 degrees in the Upper Basin and in the 60s and 70s in the Lower Basin.  Nighttime lows in the Upper Basin have ranged from 35 to 56 degrees. Low temperatures in the Lower Basin have ranged from 37 to 64 degrees.  A significant rainfall event on April 12 strongly influenced some parameters.

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

For the April sample run, most of the water quality values seen at the Upper Basin sites were consistent with water of high quality.  A rain event on April 12 during the sample run resulted in some high values for turbidity and fecal coliform at river sites sampled that day.  Fecal coliform to fecal streptococcal ratios at these sites indicate the high bacteria values were not due to human sources.  Water Temperature and dissolved oxygen values at Lake Tawakoni and Lake Fork were very similar throughout the water column.  Ammonia was elevated at SR15.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

April WQM sampling results were indicative of high water quality at most sites. Profiles taken at deep-water stations on the reservoir exhibited thermal stratification with near-anoxic conditions at approximately 15 meters. Stations TB6N, TB6I, TB8 and BA4 had fecal counts above stream standards. Station BA4, compared to other sites analyzed during this sampling event, had higher sulfate and chloride levels and slightly higher conductivity readings. 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. Stations SR1, SRT2, SRT1 and ICW1 had fecal counts above stream standards. Recent rainfall before and during the sampling event could have contributed to the elevated fecal counts. Salinity was recorded 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