Sabine River Authority of Texas

Date: 7/15/98

To: Interested Parties

From: Environmental Services

RE: Water Quality Monitoring Report

Please find attached the Sabine River Authority Water Quality Report for June 1998. Water quality sampling was performed on June 9th and June 10th. Weather during the month can be characterized as warm and dry throughout the basin. The only significant rainfall during this month occurred on June 5th in the Upper Basin and June 6th in the Lower Basin. This was four days prior to the sampling event. The maximum recorded rainfall was 1.75 inches.

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

Most of the parameter's values seen in the Upper Basin sites are consistent with water of high quality. Lake Fork and Lake Tawakoni were stratified with respect to dissolved oxygen but only the Lake Fork sites exhibited strong thermal stratification. A minor fish kill was reported on Lake Tawakoni on 5/31/98. Percent saturation of dissolved oxygen was over 100% at SR19, SR11, and SR10 indicating high algal activity. SR14 had an elevated fecal coliform count as well as elevated nitrate/nitrite.

Lower Sabine Basin Including Toledo Bend to Morgan Bluff

Most of the values for this area of the Basin were normal for this time of the year. Stations TB6M, TB6A and TB6 also showed lower than normal dissolved oxygen values. Fecal coliform numbers were also low at all Lower Basin sites. Most secchi disk numbers were high throughout the basin indicating good water transparency. Station TB6N had extremely low dissolved oxygen values. Conductivity, ammonia and TOC values were slightly elevated indicating higher than normal organic loading possibly due to the wastewater treatment facility outfall upstream of this site. Bayou Anacoco (BA4) had elevated TOC, nitrite/nitrate, choride, sulfate and the lowest secchi disk value. Most lake sites at Toledo Bend are now well stratified. Due to equipment problems dissolved oxygen and the corresponding percent saturation values at four locations (SR5, SR3, BCC1 and SR2) were not collected.


Tidal Section of the Sabine Basin Below Morgan Bluff

Values for stations in the tidal portion of the Sabine Basin were in a range that was normal and consistent with waters of high quality. No tidal movement was observed during this sampling. Salinity levels detected at four of the five locations in the Tidal Area of the Basin were a reflection of the low flow conditions and tidal influence at these stations. The highest surface salinity (9ppt) was at SRT1. Conductivity, total hardness, chloride, and sulfate were also higher at these sites due to saltwater influence. ICW1, SRT1, and BB1 showed elevated values for nitrate / nitrite. The orthophosphate value at ICW1 was also elevated.

Additional data for these monitoring stations is available on our World Wide Web site ( If you have any questions or comments concerning this report please contact: