To: Interested Parties

From: Environmental Services division

RE: October 2003 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for October 2003. Water quality sampling was performed October 13th through October 16th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime high air temperatures from the mid 70s to the mid 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the mid 70s to the mid 80s. Lows ranged from 62F to 68F at Lake Tawakoni and from 60F to 67F at Lake Fork. Toledo Bend and Orange had lows ranging from the low 40s to the low 70s. The deeper reservoir sites remained thermally stratified. During the 28 days since the September sample run, the Upper Basin received 0.76 and 1.83 inches of rainfall as recorded at Lake Tawakoni and Lake Fork, respectively. The week prior to the sample run, Lake Tawakoni received 0.41 inches and Lake Fork received 0.31 inches of rain. Toledo Bend and Orange received 1.83 and 6.8 inches, respectively, during the 28 days preceding the sample run.

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

For the October sample run, most parameter measurements at Upper Basin sites were consistent with water of high quality. Orthophosphates at LT23D were above screening levels. SR10 exceeded the stream standards numeric criteria for chlorides. All Upper Basin sites were within the stream standards numeric criteria for E. coli.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The October monthly sampling results were indicative of water of high quality at most sites. The last significant amount of rainfall the area received was three days prior to the sample run. The level of Toledo Bend Reservoir was recorded at 166.28 feet with no discharge from the spillway or the generator at the time of sampling. Stratification was present at all lake sites, and anoxic conditions were only present at the deepest depths at several of the deep-water stations. Station TB6R had a pH level that was above the stream standard, a high dissolved oxygen with supersaturation at the surface, and very good transparency. The high dissolved oxygen and supersaturation at the surface are indicative of an algal bloom at TB6R, the probable cause of the high pH result.


Tidal Section of the Sabine Basin below Morgan Bluff

Stations sampled in the tidal portion of the Sabine Basin had values that were consistent with water of high quality at most sites. The last significant rainfall the area received was six days prior to sampling. The area received over three and a half inches of rain during this event. Most sites in this segment of the Basin showed some signs of stratification with slight oxygen differences throughout the water column. Anoxic conditions were found at only one tidal station. Surface salinity was found at all but the two most northern tidal stations. Among the stations with surface salinity, the salinity values ranged from 1.0 ppt at station SRT1b to 4.0 ppt at stations SRT1, SRT1a, and BB1. The highest salinity, 12.0 ppt, was found at station SRT1, the most southern site on the Sabine River, at the deepest depth measured. All parameters measured at the tidal sites were within the stream standards set for this section of the Basin.

 

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, December 23, 2003