To: Interested Parties

From: Water Resources Branch

RE: July 2006 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for July 2006. Water quality sampling was performed July 10th through July 13th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs in the upper 80s to upper 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the low 80s to the mid 90s. Lows ranged from the low 60s to mid 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 50s to the mid 70s. During the 28 days prior to the sample run, the Upper Basin received 0.62 and 3.60 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.10 inches of rain and Lake Fork received 1.51 inches of rain the week preceding the sample run. Toledo Bend and Orange received 2.00 and 12.22 inches of precipitation during the 28 days prior to the sample run.

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 for the July sample run. The level of Lake Fork was recorded at 399.80 feet msl with 19 cfs releases and the level of Lake Tawakoni was recorded at 429.95 feet msl with 6 cfs releases at the time of sampling. Stations LT23A, LT23C, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a. Station SR14 exceeded the recommended screening criteria for Nitrate. LT23D and SR14 exceeded the recommended screening criteria for Ortho-phosphate. Station SR11 and SR10 exceeded the recommended screening criteria for sulfate. 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 just over one inch of rainfall during the week prior to and during sampling. The level of Toledo Bend Reservoir was recorded at 165.92 feet msl with 204 cfs discharge at the time of sampling. Most reservoir stations were stratified with dissolved oxygen and temperature differences throughout the water column. Anoxic conditions were found at several of the deeper lake stations. Stream standards numeric criteria were exceeded at stations TB8, TB7A, and SR3 for sulfate. The screening criteria was exceeded at station TB6R for chlorophyll a.

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 3.17 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, 12 ppt, was found at Stations SRT1C at the deepest depths. All the parameters measured fell 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 Monday, December 11, 2006 at 10:18