Sabine River Authority of Texas

To: Interested Parties

From: Environmental Services division

RE: august 2001 Water Quality Monitoring Report

This is the Sabine River Authority Water Quality Summary for August 2001. Water quality sampling was performed August 14th through August 16th. Recent weather was hot with little rainfall. The Upper Basin received 0.77 - 0.21 inches of rainfall during the 28days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. Toledo Bend and Orange received 1.21 and 5.74 inches respectively during the 28 days preceding the sample run. Recent daytime high temperatures were in the upper 90's to low 100's in the Upper Basin and in the mid to low 90's in the Lower Basin. Nighttime lows were in the 70's. Reservoirs were thermally stratified.

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

For the August sample run, most of the parameter's values seen at the Upper Basin sites were consistent with water of high quality. Five Upper Basin sites had at least 100% saturation of dissolved oxygen, indicating algal bloom conditions. Bacteriological counts were within stream standards at all Upper Basin sites. Lake Fork Reservoir was thermally stratified near seven meters. Lake Tawakoni was thermally stratified at nine meters at LT23A and only weakly stratified at the shallower, upper-lake sites. LT23D in Kitsee Inlet at Lake Tawakoni had a slightly elevated orthophospate level. The Sabine River tributary, Harris Creek (HRS16), had low dissolved oxygen. Water clarity was very good and the water was not significantly colored. A brief check of the City of Winona's outfall about mile upstream indicated it was probably not causing the low dissolved oxygen.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

August WQM sampling results were indicative of water of high quality at most sites. Toledo Bend Reservoir was below pool level at the time samples were taken. Thermal stratification of the water profile was exhibited at deep-water stations. Anoxic conditions were also observed at nearly all lake stations at the deeper depths. Stations TB6N, TB6, TNH01, TB8, TB6L, TB6F, TB6CN and TB6M had oxygen readings that were below stream standards. Station TB6N had a chloride result that was above set stream standards for Toledo Bend Reservoir. Station TNH01 had significantly higher values for nitrate and nitrite readings than other stations sampled. Station TB8 had a fecal coliform result that was above stream standards. SRA investigated a leak from a force main of a nearby municipal wastewater treatment plant. The leak had been repaired but some wastewater did enter the Sabine River upstream of Station TB8. This would explain the higher fecal coliform count reported.

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. Stations AB7 and CB4 had oxygen readings below stream standards and fecal counts above set standards for these two water bodies. Salinity readings were low at the surface of all tidal stations. A definite salt-water wedge was observed at Station SRT1 with a salinity reading of 14 ppt at 9.7 meters. Water profiles showed only a slight thermal stratification from surface to deepest depths. Station CB1 had a slightly higher nitrate and nitrite reading than other sites sampled.

 

 

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:

 

       Upper Sabine Basin
John Payne, Upper Basin Field Office Coordinator
903-878-2420 (sraubfo@yahoo.com)

       Lower and Tidal Sabine Basin
Cynthia Darbonne, Lower Basin Field Office Coordinator
409-746-3284 (darbonne@sra.dst.tx.us)

       If above are unavailable
Miles Hall, Assistant Division Manager Environmental Services
409-746-2192 (mhall@sra.dst.tx.us)

 

Printed Friday, October 19, 2001