To: Interested Parties
From: Environmental Services division
This is the Sabine River Authority Water Quality Report for February 2003. Water quality sampling was performed February 4th through February 6th. Recent weather in the Basin was cool with daytime high air temperatures from the 40’s to the 70’s at Lake Tawakoni and Lake Fork, and ranging from 50’s to the 70’s at Toledo Bend Reservoir and in Orange. Lows were mostly in the low 30’s at Lake Tawakoni and Lake Fork, 30’s through 50’s at Toledo Bend and Orange. The Upper Basin received 0.14 and 0.15 inches of rainfall during the 21 days since the previous sample run as recorded at Lake Tawakoni and Lake Fork respectively. All but a few 100ths of an inch was during the previous seven days. Toledo Bend and Orange recorded 0.91 and 1.97 inches respectively during the 21 days preceding the sample run. Reservoir profiles indicated complete mixing of the water column in Lake Tawakoni, Lake Fork and Toledo Bend reservoirs.
Upper Sabine Basin Above Toledo Bend Including Lake Fork and Lake Tawakoni
For the February sample run, most of the parameter's values seen at the Upper Basin sites were consistent with water of high quality. Lake Tawakoni and Lake Fork recorded no significant rainfall seven days prior to sampling. SR14 exceeded numeric criteria for the stream standards for E. coli. Surface water temperatures were between 7.55 and 10.6ºC at river and reservoir sites. SR10, LT23C and LT23D were slightly over 100% saturated with oxygen. Surface water temperatures near the dams at Lake Tawakoni and Lake Fork were 7.55 and 7.88ºC respectively. Bottom temperatures at the same sites were essentially the same as their surface temperatures. Lake Tawakoni and Lake Fork were completely mixed.
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 last significant rainfall the area received was five days prior to the sample run. The level of Toledo Bend Reservoir was recorded at 168.93 feet with no gates discharging from the spillway and no generation from the powerhouse at the time of sampling. All lake sites were very well mixed with similar readings throughout the water column at all sites. Site TB6N had a bacterial result that was above the stream standard. This station is located in a small, slow-moving bayou, and does not represent the conditions of the main body of the reservoir. Stations located in the main body of the reservoir showed no impact from the water quality conditions indicated in this backwater area.
Tidal Section of the Sabine Basin below Morgan Bluff
Stations sampled in the tidal portion of the Sabine Basin had values that were consistent with water of high quality at most sites. The area received a significant amount of rainfall three days prior to the sample event. Most sites in this section of the Basin showed some signs of stratification with slight oxygen differences throughout the water column. Surface salinities were found at all but one tidal station, and the highest salinity was found at station SRT1, 18ppt, at a depth of 9.9 meters. All of the tidal stations displayed high bacterial counts, which could be attributed to the recent rainfall.
This Report and additional data for these monitoring stations are available on our World Wide Web site (www.sra.dst.tx.us). If you have any questions or comments concerning this report, please contact:
Ø Upper Sabine Basin
John Payne, Upper Basin Field Office Coordinator
Ø Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
If above are unavailable
Miles Hall, Assistant Division Manager Environmental Services
Printed Thursday, April 24, 2003