To: Interested Parties

From: Water Resources Branch

RE: April 2006 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for April 2006. Water quality sampling was performed April 24th through April 27th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs in the low 70s to mid 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 70s to the low 90s. Lows ranged from the upper 40s to upper 60s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 40s to the mid 60s. During the 28 days prior to the sample run, the Upper Basin received 1.55 and 0.65 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni received 1.5 inches of rain and Lake Fork received 0.59 inches of rain the week preceding the sample run. Toledo Bend and Orange received 2.36 and 1.04 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 April sample run. The level of Lake Fork was recorded at 400.60 feet msl with 8 cfs releases and the level of Lake Tawakoni was recorded at 432.14 feet msl with 6 cfs releases at the time of sampling. Stations SR22 and SR21 fell below the stream standards numeric criteria for dissolved oxygen. Stream standards numeric criteria for E. coli were exceeded at SR17 and for chloride at SR21. Stations LF3, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The April monthly sampling results were indicative of water of high quality at most sites. The area received 2.78 inches of rainfall the week prior and during sampling. The level of Toledo Bend Reservoir was recorded at 168.31 feet msl 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 of the deep-water lake stations. Stream standards numeric criteria for E. coli were exceeded at stations BA4, SR5, and BCC1, most likely the result of heavy rainfall received just prior to sampling in this area of the river. The dissolved oxygen results at stations TB8 and TB7A fell below the stream standards numeric criteria, and station TB6A exceeded 105% saturation of dissolved oxygen, indicating an algal bloom. Sulfate values exceed numeric criteria at stations TB8 and SR3

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 under one inch of rainfall in the seven days prior to the sample event, with most of that amount falling the day before sampling. Surface salinities were found at all but one tidal station. The largest salinity value, 13 ppt, was found at station SRT1B at a depth of 10.2 meters. All the parameters measured fell within stream standards numeric 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 Wednesday, August 23, 2006 at 12:53