To: Interested Parties

From: Water Resources Branch

RE: December 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for December 2005. Water quality sampling was performed December 12th through December 15th. Recent weather (previous seven days) in the Sabine River Basin was cool, with daytime highs in the low 30s to upper 60s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 40s to the low 70s. Lows ranged from the mid teens to low 40s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 20s to the low 40s. The waters of Lake Tawakoni and Lake Fork were thermally mixed. During the 28 days prior to the sample run, the Upper Basin received 0.51 and 0.66 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.06 inches of rain and Lake Fork received 0.46 inches of rain the week preceding the sample run. Toledo Bend and Orange received 3.23 and 6.42 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 December sample run. The level of Lake Fork was recorded at 398.93 feet msl with 21 cfs releases and the level of Lake Tawakoni was recorded at 429.89 feet msl with 6 cfs releases at the time of sampling. Station LT23D exceeded 100 percent saturation for dissolved oxygen, and stations LT23A and LF3 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 SR14 exceeded the recommended screening criteria for nitrate and ortho-phosphate.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The December monthly sampling results were indicative of water of high quality at most sites. The area received 0.56 inches of rainfall the week prior and during sampling. The level of Toledo Bend Reservoir was recorded at 162.87 feet msl with 174 cfs discharge at the time of sampling. Most reservoir stations were slightly stratified with only small dissolved oxygen and temperature differences throughout the water column. No anoxic conditions were found at any of the lake stations. Stations TB8 and TB7A recorded a chloride and sulfate result above the stream standards numeric criteria, and station TB8 also displayed a dissolved oxygen percent saturation and a nitrate value above the recommended screening criteria level.

Tidal Section of the Sabine Basin below Morgan Bluff

Most sites sampled in the tidal portion of the Sabine Basin had values consistent with water of high quality. The tidal stations received 2.01 inches of rainfall the day of and the day prior to the sample event. All stations in this section of the Basin showed stratification, but no anoxic conditions were found at any of the stations. Surface salinities were found at all of the tidal stations. The largest salinity value, 21 ppt, was found at station SRT1B at a depth of 9 meters. All but one tidal station recorded bacterial results above the stream standards numeric criteria. These results were a direct result of the heavy rains the area received during the sampling event.


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 Thursday, May 11, 2006 at 14:08