To: Interested Parties

From: Water Resources Branch

RE: September 2006 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for September 2006. Water quality sampling was performed September 11th through September 14th. Recent weather (previous seven days) in the Sabine River Basin was hot, with daytime highs in the mid 70s to upper 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the low 80s to the low 90s. Lows ranged from the low 60s to low 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the low 60s to the low 70s. During the 28 days prior to the sample run, the Upper Basin received 0.68 and 2.57 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.14 inches of rain and Lake Fork received 0.07 inches of rain the week preceding the sample run. Toledo Bend and Orange received 2.82 and 1.06 inches of precipitation during the 28 days prior to the sample run. Continuing drought in the upper and middle Basin affected water quality at several sites.

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

Water quality parameter measurements at the Upper Basin sites were consistent with water of high quality for the September sample run. The level of Lake Fork was recorded at 398.47 feet msl with 33 cfs releases and the level of Lake Tawakoni was recorded at 427.48 feet msl with 6 cfs releases at the time of sampling. Station LT23C and SR11 exceeded the stream standards numeric criteria for pH. Stations LT23C, LT23D, LT23A, LF3, LF4, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a. LT23D and SR14 exceeded the recommended screening criteria for ortho-phosphate. Station SR14 exceeded the recommended screening criteria for nitrate. Station SR11 and SR10 exceeded the recommended screening criteria for sulfate. Station SR11 also exceeded the recommended screening criteria for chloride. All reservoir and stream sites were within the numeric criteria for the stream standards for E. coli.


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 0.26 inches of rainfall during sampling. The level of Toledo Bend Reservoir was recorded at 162.18 feet 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 lake stations at their deepest depths. The stream standards numeric criteria were not met at station TB8 for chloride, and sulfate. Stations TB6LN and TB6J exceeded the criteria for pH. The screening criteria were exceeded at station TB6F for chlorophyll a.

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 stations received 0.59 inches of rainfall in the seven days prior to the sample event. Surface salinities were found at each of the Tidal stations. The largest salinity value, 20 ppt, was found at station SRT1 at a depth of 10.2 meters. Station SR1 did not meet the stream standards numeric criteria for DO. Stations BB1, SRT1A, and SRT1 did not meet the standards criteria for Enterococcus. The southern section of the tidal basin received rainfall two days prior to sampling, which could account for the higher bacteriological results.

 

 

This Report and additional data for these monitoring stations are available on our World Wide Web site (www.sratx.org). 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@sratx.org)

  Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (jwiegreffe@sratx.org)

  If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (jpayne@sratx.org)
or
Miles Hall, Environmental Services Division Manager
409-746-3284 (mhall@sratx.org)

 

Printed Monday, February 26, 2007 at 13:33