To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for January 2001. Water quality sampling was performed January 9th through January 11th. The Upper Basin received 5.67-6.07 inches of rainfall during the 28days since the previous sample run, as recorded at lakes Tawakoni and Fork. Toledo Bend and Orange received 3.62 and 1.88 inches respectively during the 28 days preceding the sample run. Daytime-high air temperatures were in the 50's and 60's in the Upper and Lower Basin. Lows were in the 20's and 30's. Temperature and dissolved oxygen profiles indicate the reservoirs were 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 January sample run, most of the parameter's values seen at the Upper Basin sites were consistent with water of high quality. Lake Fork and Tawakoni reservoirs were completely mixed. All of the Upper Basin river sites had low fecal coliform bacteria counts and river sites were unusually clear (low turbidity) due to releases from Lakes Tawakoni and Fork. One site at Lake Tawakoni (LT23A) had slightly elevated chlorophyll a.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
January WQM sampling results were indicative of water of high quality at most sites. Toledo Bend Reservoir levels were still below pool level at the time samples were taken. Deep-water stations sampled on the reservoir were well mixed and did not exhibit thermal stratification except at the deepest station, TB6A. Station TB6N had sulfate levels higher than stream standards set for Toledo Bend Reservoir. TB6N is sampled from a bayou located downstream from a municipal wastewater treatment plant. Station BA4 had higher conductivity readings than corresponding river sites and levels of sulfate, chloride and fecal coliform that exceeded standards set for the Sabine River Basin. 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. Fecal coliform standards were exceeded at four stations: AB7, AB2, CB4, and CB1. Surface salinity readings exceeded 1 ppt at only one site, Station BB1.The greatest salinity reading of 15 ppt was observed at the deepest depth at Station SRT1. Deep-water stations sampled did not exhibit thermal stratification or a salt-water wedge except at river tidal station SRT1.
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:
Ø Upper Sabine Basin
John Payne, Upper Basin Field Office Coordinator
Ø Lower and Tidal Sabine Basin
Cynthia Darbonne, Lower Basin Field Office Coordinator
If above are unavailable
Miles Hall, Environmental Services Assistant Division Manager
Printed Tuesday, March 20, 2001