To: Interested Parties

From: Environmental Services division

RE: November 2003 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for November 2003. Water quality sampling was performed November 3rd through November 6th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime high air temperatures from the mid 70s to the upper 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 50s to the mid 80s. Lows ranged from 47F to 68F at Lake Tawakoni and from 47F to 59F at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 30s to the mid 60s. Only the deepest reservoir sites have weak thermal stratification present. During the 28 days since the October sample run, the Upper Basin received 0.41 and 0.31 inches of rainfall as recorded at Lake Tawakoni and Lake Fork, respectively. The week prior to the sample run, Lake Tawakoni and Lake Fork both received no rain. Toledo Bend and Orange received 2.06 and 4.26 inches, respectively, during the 28 days preceding the sample run.

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

For the November sample run, most parameter measurements at Upper Basin sites were consistent with water of high quality. Dissolved oxygen levels at LT23C and SR10 were at or just above 100% saturation, indicating algal activity. Orthophosphates at LT23D were above screening levels. Chloride levels at SR11 were slightly above stream standards. All Upper Basin sites were within the stream standards numeric criteria for E. coli.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The November monthly sampling results were indicative of water of high quality at most sites. The last significant amount of rainfall the area received was seven days prior to the sample run. The level of Toledo Bend Reservoir was recorded at 165.96 feet with no discharge from the spillway or the generator at the time of sampling. Stratification was present at all the lake sites, and anoxic conditions were only present at the deepest depths at one of the deep-water stations. Stations TB6R, TB6LN, TB6J, TB6K, and TB6Q had pH levels that were above the stream standard, high dissolved oxygen readings with supersaturation at the surface, and very good transparency. The high dissolved oxygen and supersaturation readings at the surface indicate an algal bloom which may cause elevated pH. Station TB7A also had Chloride and Sulfate results that were above the stream standard.

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 last significant rainfall the area received was over a week prior to sampling. Most sites in this section of the Basin showed some signs of stratification with slight oxygen differences throughout the water column. No anoxic conditions were found at any tidal station. Surface salinities were found at all but the most northern tidal station. Among the stations with surface salinity, the salinity values ranged from 2.0 ppt at station SRT1C to 7.0 ppt at station SRT1. The highest salinity, 16.0 ppt, was found at station SRT1B at the deepest depth measured. All parameters from the tidal sites were within stream standards.

 

 

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:

 

      Upper Sabine Basin
Terry Wilson, Upper Basin Field Office Coordinator
903-878-2420 (twilson@sra.dst.tx.us)

      Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (jwiegreffe@sra.dst.tx.us)

      If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (jpayne@sra.dst.tx.us)
or
Miles Hall, Resource Management/ Project Development Division Manager
409-746-2192 (mhall@sra.dst.tx.us)

 

Printed Tuesday, April 27, 2004