To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Report for April 2003. Water quality sampling was performed April 8th through April 10th. Recent weather in the Basin was cool with daytime high air temperatures from the 70’s to the 80’s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the 60’s to the 80’s. Lows were quite variable, ranging from 44 to 64 at Lake Tawakoni and from 43 to 64 at Lake Fork. Toledo Bend and Orange had lows ranging from 38 to 71. The Upper Basin received 1.75 and 1.53 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 100ths of an inch were more than seven days prior to the sample run. Toledo Bend and Orange recorded 2.41 and 1.56 inches respectively during the 28 days preceding the sample run. Reservoir sites are beginning to show thermal stratification.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the April sample run, most of the parameter’s values seen at the Upper Basin sites were consistent with water of high quality. Lake Tawakoni and Lake Fork recorded only a few hundredths of an inch of rainfall during the seven days prior to sampling. SR19 had over 100% saturation of dissolved oxygen indicating some possible algal activity. SR22, SR15 and SR14 exceeded the numeric criteria for the stream standards for E. coli. Surface water temperatures were between 13.4 and 18.0ºC at river and reservoir sites. Surface water temperatures near the dams at Lake Tawakoni and Lake Fork were 14.2 and 13.4ºC respectively. Recent heavy winds maintained a mixed profile in the shallow reservoir sites with a weak thermal stratification appearing in the deeper reservoir sites.
Lower Sabine Basin Including Toledo Bend to Morgan Bluff
The April monthly sampling results were indicative of water of high quality at most sites. It had been greater than seven days since the area received a significant amount of rainfall. The level of Toledo Bend Reservoir was recorded at 171.09 feet with no discharge from the spillway, but the generator was operating at the time of sampling. Stratification was present at all the lake sites. No profiles were taken at station TB6A because the station could not be sampled by boat due to strong north winds on the lake, which caused very rough conditions. The samples were taken from the embankment above the generator. All readings taken were within the stream standards for this section of the Basin.
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 a slight amount of rainfall two days prior to the sample event, but it has been greater than seven days since a real significant rainfall. Most sites in this section of the Basin showed some signs of stratification with slight oxygen differences throughout the water column. The only salinity reading found was at station SRT1 at a depth of 9.9 meters. A reading of 3 ppt salinity was found there. 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:
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, Resource Management/ Project Development Division Manager
Printed Wednesday, June 04, 2003