To: Interested Parties

From: Water Resources Branch

RE: May 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for May 2005. Water quality sampling was performed May 9th through May 12th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs from the mid 60s to the mid 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 60s to the mid 80s. Lows ranged from the upper 40s to the low 60s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 40s to the upper 60s. The waters of Lake Tawakoni and Lake Fork were beginning to show thermal stratification. During the 28 days prior to the sample run, the Upper Basin received 0.59 and 0.66 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni and Lake Fork received 0.49 and 0.52 inches of rainfall the week preceding the sample run. Toledo Bend and Orange received 1.01 and 1.38 inches, respectively, 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 402.73 feet msl with 8 cfs releases and the level of Lake Tawakoni was recorded at 436.62 feet msl with 6 cfs releases at the time of sampling. Stations SR22 and SR19 exceeded the recommended screening criteria for chlorophyll a and station SR22 exceeded the Stream Standards numeric criteria for E. coli. Station SR10 had an elevated level of dissolved oxygen with greater than 100 percent dissolved oxygen saturation.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The May monthly sampling results were indicative of water of high quality at most sites. The area received 0.8 inch of rain during the week of sampling. The level of Toledo Bend Reservoir was recorded at 170.25 feet msl with 204 cfs discharge at the time of sampling. Most reservoir stations were stratified with dissolved oxygen and pH differences throughout the water column. Anoxic conditions were found at the deepest mid-lake station. The dissolved oxygen percent saturation at stations TB8 and TB6LN and the chlorophyll a result at station TB6R were above recommended screening criteria for each parameter. The E. coli result at station BCC1 was above Stream Standards numeric criteria, and station SR3 had a higher than normal sulfate result.

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 just over 0.5 inch of rainfall during the seven days prior to the sample run. Most of the sites in this section of the Basin were stratified, but no anoxic conditions were found at any tidal station. Surface salinities were found at all but two stations. The greatest salinity value of 14 ppt was found at station SRT1C at a depth of 11.2 meters. All parameters measured in this section of the Basin were within Stream Standards criteria.


This Report and additional data for these monitoring stations are available on our World Wide Web site ( 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 (

      Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (

      If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (
Miles Hall, Resource Management/ Project Development Division Manager
409-746-2192 (


Printed Friday, July 22, 2005 at 10:22