Sabine River Authority of Texas

Date: 6/29/99

To: Interested Parties

From: Environmental Services

RE: March 1999 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Report for March 1999. Water quality sampling was performed March 9 through March 11. Weather during March can be characterized as warm and wet throughout most of the Basin. Toledo Bend received the most rain (8.21 inches) and the coastal area of the Basin received the least. Most of the Tidal Area and the Lower Basin sampling were conducted prior to the heavy rainfall in dry conditions. The Upper Basin however, was sampled just two days after a significant rainfall event. The Bon Wier gage also received 0.6 inches of rain two days prior to WQM sampling. Due to failure of laboratory equipment values for ammonia, nitrate & nitrite, orthophosphate, total hardness and total alkalinity were not obtained.

 

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

Values measured at sites in the Upper Basin during WQM are consistent with water of high quality. All of the sites sampled on Lake Fork and Lake Tawakoni had uniform temperature and dissolved oxygen levels from bottom to surface indicating complete mixing of the water column. Percent saturation of dissolved oxygen was in the nineties at most sites. Several Lake sites had values above 100% saturation and several river sites had values in the seventies or eighties. High turbidity values were recorded at four river sites in the Upper Basin. Most of these sites also had high coliform values. These values may be attributed to the rainfall just prior to the WQM sampling.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

Values measured during the March WQM were within normal range for this time of year and indicative of waters with high quality. Stations TB6N, TB6I and BCC1 had elevated fecal coliform values. Station TB6I also had an elevated sulfate value and an elevated turbidity value. Several other sites had elevated turbidity values (TB6N, TB8, TB6M, and BA4). This suggests that these sites might have been affected by runoff. Station TB6H was stratified with respect to dissolved oxygen but not temperature. All other Lake sites showed no stratification.

 

Tidal Section of the Sabine Basin below Morgan Bluff

Values for stations in the tidal portion of the Sabine Basin were also consistent with waters of high quality. No values measured were outside of stream standard criteria. Salinity was detected at one (BB1) of the five sites in this section of the Basin. All other sites had salinity values of less than 1 ppt.

 

 

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