To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Summary for January 2002. Water quality sampling was performed January 8th through January 10th. Recent weather was cool. The Upper Basin received 7.67 – 8.97 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 6.01 and 4.26 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 at Lake Tawakoni and Lake Fork were in the upper 30’s early in the week and warmed to the 40’s and 50’s later in the week. Toledo Bend and Orange reported temperatures in the 40’s early in the 7-day period and warmed to the 50’s and 60’s during the sample run. Recent nighttime lows were in the teens, 20’s and 30’s. Vertical profiles indicate similar dissolved oxygen levels surface to bottom at all reservoir sites.
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. The most recent rain was three to four days prior to the sample date. Water clarity was generally good and bacteriological counts were well under stream standards limits. Water temperatures were quite low after recent cold weather and dissolved oxygen was at least 10 mg/L at all sites. Orthophosphate exceeded screening guidelines at the upstream sites on Lake Tawakoni (LT23C and LT23D) and Lake Fork (LF3 and LF4). Cold water temperatures and low light conditions reduce algal growth and bio-assimilation of orthophosphate. Lake Fork and Lake Tawakoni were completely mixed.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The January monthly sampling results were indicative of water of high quality at most sites. The level of Toledo Bend Reservoir reached normal levels after the drawdown of late last year, with the level just over 170 feet msl. All lake sites showed oxygen levels that were very similar throughout the water column. E. coli results that were above stream standards were found at stations TB6M and TB6L.
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. All stations were very well mixed with respect to temperature and dissolved oxygen. The only salinity reading was recorded at station BB1, with a value of 2 ppt at the surface and at a depth of 4.2 meters. All values recorded in the tidal portion were within the stream standards set 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 Tuesday, April 02, 2002