To: Interested Parties

From: Water Resources Branch

RE: February 2006 monthly Water Quality Report

Water quality sampling was performed February 13th through February 16th. Recent weather (previous seven days) in the Sabine River Basin was cool, with daytime highs in the mid 40s to low 70s 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 20s to low 40s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 20s to the upper 30s. The waters of Lake Tawakoni and Lake Fork were thermally mixed. During the 28 days prior to the sample run, the Upper Basin received 4.83 and 4.89 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 0.28 inches of rain and Lake Fork received 0.48 inches of rain the week preceding the sample run. Toledo Bend and Orange received 8.02 and 5.39 inches of precipitation 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 the Upper Basin sites were consistent with water of high quality for the February sample run. The level of Lake Fork was recorded at 398.88 feet msl with 8 cfs releases and the level of Lake Tawakoni was recorded at 428.78 feet msl with 6 cfs releases at the time of sampling. Stations LT23A, LF4, and SR19 exceeded the recommended screening criteria for chlorophyll a.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The February monthly sampling results were indicative of water of high quality at most sites. The area received 2.49 inches of rainfall the week prior to sampling. The level of Toledo Bend Reservoir was recorded at 164.88 feet msl with 174 cfs discharge at the time of sampling. Reservoir stations were mixed with only small dissolved oxygen and temperature differences throughout the water column. All of the lake stations were well oxygenated. Stations TB8, TB7A, TB6J, TB6F, TB6CN, BT1, and SR2 all recorded bacterial results above the stream standards numeric criteria. The heavy rains that fell just prior to the sampling event likely caused these results.

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 1.06 inches of rainfall in the seven days prior to the sample event. Some stations in this section of the Basin showed stratification, but all were well oxygenated. Surface salinities were found at all but three of the tidal stations. The largest salinity value, 19.6 ppt, was found at Station SRT1 at a depth of 10 meters. All but one tidal station recorded bacterial results above the stream standards numeric criteria. These results were likely a result of the heavy rains the area received.


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 Monday, May 15, 2006 at 15:37