To: Interested Parties

From: Water Resources Branch

RE: May 2004 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for May 2004. Water quality sampling was performed May 10th through May 13th. Recent weather (previous seven days) in the Sabine River Basin was mild, with daytime high air temperatures from the mid 70s to the mid 80s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the low 70s to the upper 80s. Lows ranged from the low 50s to the mid 60s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the low 50s to the mid 70s. Lake Tawakoni and Lake Fork exhibited thermal stratification. During the 28 days prior to the May sample run, the Upper Basin received 5.53 and 5.88 inches of rainfall as recorded at Lake Tawakoni and Lake Fork, respectively. Lake Tawakoni and Lake Fork recorded no rainfall the week prior to the sample run. Toledo Bend and Orange received 11.65 and 8.96 inches, respectively, during the 28 days preceding the sample run.

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

For the May sample run, most water quality parameter measurements at Upper Basin sites were consistent with water of high quality. SR17, SR16, SR15, and SR14 did not meet stream standards numeric criteria for dissolved oxygen. The LT23D nitrate plus nitrite result was above nutrient screening levels and LT23A, LT23D, LT23C had high levels of dissolved oxygen with greater than 100 percent dissolved oxygen saturation. LT23C and LT23D also exceeded screening criteria for chlorophyll a, indicating algal activity.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The May monthly sampling results were indicative of water of high quality at most sites. The upper part of the Lower Sabine Basin received no significant rainfall in the seven days prior to the sample run, but the lower portion received more than three inches of heavy rainfall during sampling. The level of Toledo Bend Reservoir was recorded at 172.31 feet with no discharge from the spillway, but both generators were operating at the time of sampling. All reservoir stations were thermally stratified with pH and dissolved oxygen differences throughout the water column. Above normal pH values were recorded at stations TB6LN and TB6K, but these stations were supersaturated with dissolved oxygen at the surface indicating an algal bloom. Stations BA4, TB6S, SR5, and BCC1 had high bacterial counts, but these areas were sampled after very heavy rains which caused significant runoff.

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 over four and a half inches of rain the day prior to the sampling event. Most sites in this section of the Basin showed signs of stratification, but no anoxic conditions were found at any tidal station. No salinity values were recorded at any of the tidal stations due to the heavy rainfall. Bacterial counts were high at all but one of the tidal stations as a result of the recent heavy rains the area received.

 

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:

 

      Upper Sabine Basin
Terry Wilson, Upper Basin Field Office Coordinator
903-878-2420 (twilson@sra.dst.tx.us)

      Lower and Tidal Sabine Basin
Jerry Wiegreffe, Lower Basin Field Office Coordinator
409-746-3284 (jwiegreffe@sra.dst.tx.us)

      If above are unavailable
John Payne, Special Projects Administrator
409-746-2192 (jpayne@sra.dst.tx.us)
or
Miles Hall, Resource Management/ Project Development Division Manager
409-746-2192 (mhall@sra.dst.tx.us)

 

Printed Thursday, August 26, 2004 at 08:35