To: Interested Parties

From: Water Resources Branch

RE: November 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for November 2005. Water quality sampling was performed November 7th through November 10th. Recent weather (previous seven days) in the Sabine River Basin was mild, with daytime highs in the upper 60s to mid 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the mid 60s to the mid 80s. Lows ranged from the low 40s to upper 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 30s to the high 60s. The waters of Lake Tawakoni and Lake Fork were thermally mixed with only the deeper reservoir sites exhibiting a slight stratification. During the 28 days prior to the sample run, the Upper Basin received 2.06 and 1.47 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 1.35 inches of rain and Lake Fork received 0.86 inches of rain the week preceding the sample run. Toledo Bend and Orange received 1.33 and 0.95 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 November sample run. The level of Lake Fork was recorded at 399.43 feet msl with 8 cfs releases and the level of Lake Tawakoni was recorded at 430.85 feet msl with 6 cfs releases at the time of sampling. Station LT23C exceeded the stream standards numeric criteria for pH. Stations LT23C, LF3 and SR10 exceeded 100 percent saturation for dissolved oxygen. Stations LT23A, LT23D, LT23C, 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. Station SR22 fell below the stream standards numeric criteria for dissolved oxygen. Station SR14 exceeded the recommended screening criteria for ortho-phosphate.

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 area received 1.33 inches of rainfall the week prior to and during sampling. The level of Toledo Bend Reservoir was recorded at 163.21 feet msl with 174 cfs discharge at the time of sampling. Most reservoir stations were well stratified with dissolved oxygen and temperature differences throughout the water column. No anoxic conditions were found at any of the lake stations. An algal bloom was present on much of the northern sections of the reservoir as evidenced by several of the stations recording higher than normal pH readings and many of them recording dissolved oxygen percent saturation values above the recommended screening criteria value. Station TB8 recorded a chlorophyll a result above the recommended screening criteria as further evidence of the algal bloom. Stations TB8 and TB7A recorded sulfate results above the stream standards numeric criteria and TB8 also displayed a chloride result above the stream standards numeric 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. The tidal sites showed a large improvement over the conditions that were present in late September and October due to Hurricane Rita. The dissolved oxygen levels in this section of the Basin were at or near normal levels at all but one site, after being anoxic for a period of time after the Hurricane. The tidal stations received 0.95 inches of rainfall just over seven days prior to the sample event. All stations in this section of the Basin showed stratification, and anoxic conditions were found at two of the deeper stations. Surface salinities were found at all of the tidal stations. The largest salinity value, 20 ppt, was found at Station SRT1 at a depth of 9.8 meters. Station SR1 recorded a dissolved oxygen result below the stream standards numeric criteria, and stations BB1 and SRT1 recorded a bacterial count above the stream standards numeric criteria.

 

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 Thursday, May 11, 2006 at 13:56