To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Report for January 2003. Water quality sampling was performed January 14th through January 16th. Recent weather in the Basin was cool with daytime high air temperatures from the 30’s to the 70’s at Lake Tawakoni and Lake Fork, and ranging from 40’s to the 60’s at Toledo Bend Reservoir and in Orange. Lows were mostly in the 30’s at Lake Tawakoni and Lake Fork, 20’s and 30’s at Toledo Bend, and 30’s and 40’s in Orange. The Upper Basin received 4.81 and 4.62 inches of rainfall during the 28 days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. All but a few 10ths of an inch was during the previous seven days. Toledo Bend and Orange recorded 6.08 and 4.90 inches respectively during the 28 days preceding the sample run. Reservoir profiles indicated complete mixing of the water column in Lake Tawakoni, Lake Fork and Toledo Bend reservoirs.
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. Sites SR22, SR15, SR14 and SR11 exceeded numeric criteria for the stream standards for E. coli. Surface water temperatures were between 6.29 and 8.83ºC at river and reservoir sites. LT23D, at Lake Tawakoni, exceeded reservoir-screening criteria for chlorophyll a. No stream standards exist for chlorophyll a, so screening values are used as a guide. Surface water temperatures near the dams at Lake Tawakoni and Lake Fork were 7.74 and 8.83ºC respectively. Bottom temperatures at the same sites were essentially the same as their surface temperatures. Lake Tawakoni and Lake Fork 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 area received a slight amount of rainfall the day prior to the sample run. The level of Toledo Bend Reservoir was recorded at 170.03 feet with seven gates discharging from the spillway and the powerhouse generating at the time of sampling. All lake sites were very well mixed with similar readings throughout the water column at all sites. All parameters, at all of the sites within this section of the Basin, were within the stream standards.
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 area received some rainfall two days prior to the sample event. All the sites in this section of the Basin were well mixed with only slight oxygen differences throughout the water column. No recordable salinities were found at any site at any depth. All of the tidal stations 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 Thursday, April 24, 2003