To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Report for June 2003. Water quality sampling was performed June10th through June 12th. Recent weather in the Basin was warming with daytime high air temperatures from the mid 80’s to the low 90’s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the mid 80’s to the mid 90’s. Lows were variable, ranging from 60 to 69 at Lake Tawakoni and from 61 to 72 at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 60’s to the low 70’s. The Upper Basin received 3.51 and 2.05 inches of rainfall during the 28 days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. Lake Tawakoni recorded 0.49 inches and Lake Fork recorded 0.28 inches of rain in the week prior to the sample run. Toledo Bend and Orange recorded 2.66 and 0.51 inches respectively during the 28 days preceding the sample run. Reservoir sites were thermally stratified.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the June sample run, most of the parameter’s values seen at the Upper Basin sites were consistent with water of high quality. LT23C, LT23D, LF3, SR19, SR11 and SR10 had over 100% saturation of dissolved oxygen indicating algal activity. All Upper Basin sites were within the numeric criteria for the stream standards for E. coli. Surface water temperatures were between 22.4 and 26.5ºC at river and reservoir sites. Surface water temperatures near the dams at Lake Tawakoni and Lake Fork were 23.2 and 23.5ºC respectively. Thermal Stratification was evident at reservoir sites.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The June monthly sampling results were indicative of water of high quality at most sites. The last significant amount of rainfall occurred four days prior to the sample run. The level of Toledo Bend Reservoir was recorded at 170.18 feet with no discharge from the spillway at the time of sampling. Stratification was present at all the lake sites. Anoxic conditions were also present at most of the lake sites at the deepest depths. Stations TB6N and TB6M both displayed low dissolved oxygen readings. These stations are located in headwater areas of small coves and do not represent the conditions of the main body of the reservoir. Stations in the main body of the reservoir showed no impact from the water quality conditions indicated in the backwater areas.
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. It had been just over seven days since the area received a significant amount of rainfall. Most sites in this section of the Basin showed some signs of stratification with slight oxygen differences throughout the water column. Surface salinities were found at all but one tidal station. The highest salinity, 9 ppt, was found at station SRT1 at a depth of 9.8 meters. All results from the tidal stations 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:
Upper Sabine Basin
Terry Wilson, Upper Basin Field Office Coordinator
Lower and Tidal
Jerry Wiegreffe, Lower Basin Field Office Coordinator
If above are unavailable
John Payne, Special Projects Administrator
Miles Hall, Resource Management/ Project Development Division Manager
Printed Monday, September 22, 2003