To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for November 2001. Water quality sampling was performed November 13th through November 15th. Recent weather was mild with very dry conditions in the Lower Basin and with relatively dry conditions in the Upper Basin until the day prior to the sample run when the area received about an inch of rain with considerable runoff. The Upper Basin received 1.53 – 1.82 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 0.20 and 0.10 inches respectively during the 28 days preceding the sample run. Recent daytime high temperatures were in the 70’s in the Lower Basin and quite variable in the Upper Basin ranging from the 50’s to 80’s. Nighttime lows were mostly in the 50’s. Lake Fork and Toledo Bend Reservoir were weakly stratified only at the deepest sites.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the November sample run, most of the parameter values seen at the Upper Basin sites were consistent with water of high quality. A heavy rain that passed through the Lake Fork/Lake Tawakoni area the evening prior to the first sampling date caused some high turbidity and E. coli values at several sites. Lake Tawakoni was not running over the spillway but flow was high at SR22 and SR21 downstream of Lake Tawakoni. This flow was runoff from the previous day’s rain. Bacteriological counts were above stream standards at LF20, BS18, SR22, SR21, and SR19. These high values are believed to be a result of runoff from the rain. Turbidity was very high at SR22 and SR21. Lake Fork Reservoir was mixed at the shallower sites but was thermally stratified at 16 meters at LF2 near the dam. Lake Tawakoni was mixed at all sites.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The November monthly sampling results were indicative of water of high quality at most sites. Toledo Bend Reservoir was well below pool level at the time samples were taken. The reservoir was just above 163 feet. With the repairs to the dam now complete, the waters should begin to rise to their normal levels. Thermal stratification of the water profile was exhibited at most stations. Anoxic conditions were only observed at the deep-water station closest to the dam at the deepest depth. Station TB6N had a dissolved oxygen reading that was below stream standards, and also an E. coli result that was above the stream standard. Station BA4 had a Sulfate result that was above stream standards. Station TB6H had a pH that was slightly above the stream standard but it was accompanied with high dissolved oxygen and secchi readings, which could point to an algal bloom in this section of the reservoir. Station TB6L was not sampled this month because of the low water conditions in the reservoir.
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. Station SRT2 was the only site that showed any saltwater gradient. Enterococcus results were found to be over the stream standard at stations BB1, SRT2, and SRT1. Salinity readings were recorded at all tidal stations. The highest salinity reading was recorded at the deep-water station SRT1. This station had a value of 17 ppt at a depth of 9.3 meters. The highest surface salinity was found at station BB1 with a value of 11 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:
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 Friday, January 11, 2002