To: Interested Parties

From: Water Resources Branch

RE: September 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for September 2005. Water quality sampling was performed September 12th through September 15th. Recent weather (previous seven days) in the Sabine River Basin was hot, with daytime highs from the mid to upper 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 80s to the mid 90s. Lows ranged from the low to mid 60s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 60s to the low 70s. The deeper waters of Lake Tawakoni and Lake Fork were thermally stratified. During the 28 days prior to the sample run, the Upper Basin received 0.05 and 1.65 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni and Lake Fork received no rainfall the week preceding the sample run. Toledo Bend and Orange received 1.34 and 1.58 inches of precipitation during the 28 days prior to the sample run.

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

Most water quality parameter measurements at Upper Basin sites were consistent with water of high quality. The level of Lake Fork was recorded at 400.34 feet msl with 64 cfs releases and the level of Lake Tawakoni was recorded at 432.44 feet msl with 6 cfs releases at the time of sampling. Station LT23C exceeded the stream standards numeric criteria for pH. Stations LT23C and SR19 exceeded 100 percent saturation for dissolved oxygen. Stations LT23A, LT23C, LT23D, LF3, LF4, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a. High chlorophyll a levels in conjunction with dissolved oxygen saturation values exceeding 100% often indicate algal bloom conditions. Stations LF3 and SR22 fell below the stream standards numeric criteria for dissolved oxygen. Station SR21 exceeded the stream standards numeric criteria for chloride. Station LT23D exceeded the recommended screening criteria for ortho-phosphate and station SR14 exceeded the recommended screening criteria for nitrate.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The September monthly sampling results were indicative of water of high quality at most sites. The area received no measurable rainfall the week prior to or during sampling. The level of Toledo Bend Reservoir was recorded at 163.37 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. Station TB7A had an elevated dissolved oxygen percent saturation, and along with station TB8, also had chloride and sulfate results above the stream standards numeric criteria. Station TB6R had a dissolved oxygen reading below the stream standards numeric criteria and also displayed a chlorophyll a result above the recommended screening criteria.

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. Tidal stations received no measurable rainfall the week prior to sampling. All stations in this section of the Basin showed stratification, and anoxic conditions were found at one of the deeper stations. Surface salinities were found at all but the northern most Tidal station. The largest salinity value, 17 ppt, was found at station SRT1C at a depth of 11.1 meters. Elevated bacteria levels were recorded at stations BB1, SRT1A, and SRT1.

 

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 Friday, February 10, 2006 at 15:16