To: Interested Parties

From: Water Resources Branch

RE: August 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for August 2005. Water quality sampling was performed August 8th through August 11th. Recent weather (previous seven days) in the Sabine River Basin was hot, with daytime highs from the mid 90s to the low 100s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 80s to the upper 90s. Lows ranged from the low 70s to the mid 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 60s to the mid 70s. The waters of Lake Tawakoni and Lake Fork were thermally stratified. During the 28 days prior to the sample run, the Upper Basin received 0.88 and 3.21 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni and Lake Fork received 0.14 and 0.04 inches of rainfall respectively the week preceding the sample run. Toledo Bend and Orange received 6.19 and 8.48 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 the Upper Basin sites were consistent with water of high quality for the August sample run. The level of Lake Fork was recorded at 401.16 feet msl with 64 cfs releases and the level of Lake Tawakoni was recorded at 433.77 feet msl with 6 cfs releases at the time of sampling. Stations LF3, LF4, and LT23C exceeded the stream standards numeric criteria for pH. Stations LF3 and LF4 exceeded 100 percent saturation for dissolved oxygen. Stations LT23A, LF3, LF4, SR22, and SR21 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 SR22 and SR21 fell below the stream standards numeric criteria for dissolved oxygen. Station LT23D exceeded the recommended screening criteria for Ortho-phosphate.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The August monthly sampling results were indicative of water of high quality at most sites. The area received 0.9 inches of rain the week prior and during sampling. The level of Toledo Bend Reservoir was recorded at 165.97 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 TB6K had an elevated dissolved oxygen percent saturation. Stations TB8, TB7A, and TB6R recorded a dissolved oxygen reading below the stream standard numeric criteria. Station TB6R 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 1.14 inches of rainfall the week prior to sampling. All stations in this section of the Basin showed slight stratification, but no anoxic conditions were found. Surface salinities were found at all but the two northern-most tidal stations. The largest salinity value, 14 ppt, was found at Station SRT1C at a depth of 8 to 11.2 meters, and at Station SRT1 at a depth of 10.5 meters. An elevated bacteria level was measured at station BB1.

 

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 27, 2005 at 10:53