To: Interested Parties

From: Water Resources Branch

RE: MAy 2007 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for May 2007. Water quality sampling was performed May 14th through May 16th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs in the upper 70s to low 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the low 80s to the low 90s. Lows ranged from the high 50s to upper 60s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 40s to the upper 50s. During the 28 days prior to the sample run, the Upper Basin received 2.14 and 3.09 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.09 inches of rain and Lake Fork received 0.23 inches of rain the week preceding the sample run. Toledo Bend and Orange received 3.53 and 3.41 inches of precipitation during the 28 days prior to the sample run. Reservoir profiles indicated thermal stratification of the water column at deeper reservoir sites in Lake Tawakoni, Lake Fork and Toledo Bend reservoirs.


Upper Sabine Basin Above Toledo Bend Including Lake Fork And Lake Tawakoni

Water quality parameter measurements at the Upper Basin sites were consistent with water of high quality at all sites for the May sample run. The level of Lake Fork was recorded at 402.11 feet msl with 22 cfs releases and the level of Lake Tawakoni was recorded at 430.98 feet msl with 6 cfs releases at the time of sampling. Station LT23C exceeded the stream standards numeric criteria for pH. Station SR22 exceeded the stream standard numeric criteria for E. coli.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The May monthly sampling results were indicative of water of high quality at most sites.  The area received 0.49 inches of rainfall during the week prior and during the sampling week.  The level of Toledo Bend Reservoir was recorded at 171.19 feet with 204 cfs discharge at the time of sampling.  Toledo Bend Reservoir stations were stratified in vertical profile samples.  Anoxic conditions were found at several of the deeper lake sites at the deepest depths.  Stations TB6R, TB6J, TB6K, and TB6H exceeded the stream standards numeric criteria for pH.


Tidal Section of the Sabine Basin below Morgan Bluff

Most sites sampled in the Tidal portion of the Sabine Basin had values that are consistent with water of high quality.  The Tidal stations received 0.75 inches of rainfall in the seven days prior to the sample event.  Surface salinities were found at three of the Tidal stations.  The largest salinity value, 11.0 ppt, was found at station SRT1A at 9.3 meters.  All parameters measured were within the stream standards numeric criteria.



This Report and additional data for these monitoring stations are available on our World Wide Web site ( If you have any questions or comments concerning this report, please contact:


  Upper Sabine Basin
Terry Wilson, Upper Basin Field Office Coordinator
903-878-2420 (

  Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (

  If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (
Miles Hall, Environmental Services Division Manager
409-746-3284 (


Printed Wednesday, October 17, 2007 at 09:21