To: Interested Parties

From: Water Resources Branch

RE: APRIL 2007 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for April 2007. Water quality sampling was performed April 16th through April 18th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs in the low 50s to low 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the mid 50s to the low 80s. Lows ranged from the low 40s to low 50s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 30s to the upper 50s. During the 28 days prior to the sample run, the Upper Basin received 5.13 and 3.74 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.76 inches of rain and Lake Fork received 0.79 inches of rain the week preceding the sample run. Toledo Bend and Orange received 3.24 and 5.99 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 April sample run. The level of Lake Fork was recorded at 402.02 feet msl with 22 cfs releases and the level of Lake Tawakoni was recorded at 431.10 feet msl with 6 cfs releases at the time of sampling. All Upper Basin stations were within the stream standards numeric criteria for temperature, pH, dissolved oxygen, chloride and sulfate. Stations LF20 and BS9 exceeded the stream standards numeric criteria for E. coli.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The April monthly sampling results were indicative of water of high quality at most sites.  The area received 1.42 inches of rainfall during sampling and the week prior.  The level of Toledo Bend Reservoir was recorded at 170.91 feet with 204 cfs discharge at the time of sampling.  Toledo Bend Reservoir stations were slightly stratified in vertical profile samples, but no anoxic conditions were found.  Stations TB6CN and BT1 exceeded the stream standards criteria for bacteria.  Runoff from recent thunderstorms in the area could be a likely cause for the higher results.

 

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 2.13 inches of rainfall in the seven days prior to and during the sample event.  Surface salinities were found at three of the Tidal stations.  The largest salinity value, 8 ppt, was found at station SRT1A at 8.0 meters.  All parameters measured were within the stream standards criteria.

 

 

This Report and additional data for these monitoring stations are available on our World Wide Web site (www.sratx.org). 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 (twilson@sratx.org)

  Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (jwiegreffe@sratx.org)

  If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (jpayne@sratx.org)
or
Miles Hall, Environmental Services Division Manager
409-746-3284 (mhall@sratx.org)

 

Printed Monday, October 01, 2007 at 15:10