To: Interested Parties

From: Water Resources Branch

RE: July 2007 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for July 2007. Water quality sampling was performed July 9th through July 11th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs in the mid 70s to mid 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 60s to mid 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the low 70s to the low 90s. During the 28 days prior to the sample run, the Upper Basin received 10.99 and 7.21 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 6.12 inches of rain and Lake Fork received 3.7 inches of rain the week preceding the sample run. Toledo Bend and Orange received 6.92 and 13.09 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 July sample run. The level of Lake Fork was recorded at 403.58 feet msl with 22 cfs releases, and the level of Lake Tawakoni was recorded at 439.55 feet msl with 5,306 cfs releases at the time of sampling. Heavy rains following an extended drought preceded the July sample run. Total organic carbon and dissolved oxygen levels reflected elevated natural organic debris contributions from the watershed. Stations SR17, SR16 and SR15 fell below the stream standards numeric criteria for dissolved oxygen. All reservoir and stream sites were within the numeric criteria for the stream standards for E. coli.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The July monthly sampling results were indicative of water of high quality at most sites. The area received 3.0 inches of rainfall during the week prior and during the sampling week. The level of Toledo Bend Reservoir was recorded at 172.08 feet with 204 cfs discharge at the time of sampling. Toledo Bend Reservoir stations were stratified in vertical profile samples. Station TB6K exceeded the stream standards numeric criteria for pH, and station TB8 fell below the standards criteria for dissolved oxygen.


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 4.70 inches of rainfall in the seven days prior to the sample event. Surface salinities were found at only one of the Tidal stations. The largest salinity value, 3.0 ppt, was found at station BB1 at 4.7 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 Tuesday, January 22, 2008 at 10:21