To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for March 2002. Water quality sampling was performed March 12th through March 14th. Recent weather was mild. The Upper Basin received 1.31 – 1.55 inches of rainfall during the 28 days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. Toledo Bend and Orange received 4.22 and 2.46 inches respectively during the 28 days preceding the sample run. Daytime high air temperatures during the most recent seven days prior to the sample run throughout the Sabine Basin were in the upper 60’s and 70’s. Recent nighttime lows were in the 30’s and 40’s. All of the reservoir profiles indicated complete mixing of the water column.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the March sample run, most of the parameter's values seen at the Upper Basin sites were consistent with water of high quality. The most recent rain was about ½ inch as recorded at Lake Tawakoni and Lake Fork the night prior to the first sample date. Water temperatures were between 8.62 and 12.3 C and dissolved oxygen was at least 10 mg/L at most sites. E. coli exceeded the stream standard at SR11 and SR10. The first day of E. coli samples were not reported due to expired test media. Nitrate/nitrite exceeded screening guidelines at LT23D. This site also had high turbidity. Lake Fork and Lake Tawakoni were completely mixed.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The March monthly sampling results were indicative of water of high quality at most sites. The last significant rainfall occurred about ten days prier to the sampling event. The level of Toledo Bend Reservoir was recorded at just over 169.5 feet with no discharges through the spillway at the time of sampling. One unit was running at the powerhouse during the sample event. All lake sites were thermally mixed. The deep-water stations did show some slight levels of oxygen stratification. E. coli results that were above stream standards were found at stations TB6N, TB6M, and TB6L. Sulfate levels at station BA4 were also above the stream standard.
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. The two lower tidal sites, BB1 and SRT1, displayed some thermal stratification. Slight oxygen stratification was seen at all the tidal sites. The only surface salinity was recorded at station BB1, with a value of 1 ppt. Station SRT1 did display some salinity values at deeper depths. It recorded a value of 3 ppt at 4.5 meters, 6 ppt at 5.5 meters and 8 ppt at 10.2 meters. All oxygen, bacterial, and pH values recorded in the tidal portion of the Basin were within the stream standards for this section of the Basin.
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
Jerry Wiegreffe, Lower Basin Field Office Coordinator
If above are unavailable
Miles Hall, Assistant Division Manager Environmental Services
Printed Thursday, June 20, 2002