To: Interested Parties

From: Water Resources Branch

RE: August 2004 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for August 2004. Water quality sampling was performed August 9th through August 12th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime high air temperatures from the mid 80s to the low 100s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the upper 80s to the upper 90s. Lows ranged from the mid 60s to the upper 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 60s to the mid 80s. Lake Tawakoni and Lake Fork exhibited thermal stratification. During the 28 days prior to the August sample run, the Upper Basin received 2.93 and 4.72 inches of rainfall as recorded at Lake Tawakoni and Lake Fork, respectively. The week prior to the sample run, Lake Tawakoni received a tenth of an inch of rain and Lake Fork received no rain. Toledo Bend and Orange received 1.17 and 1.84 inches, respectively, during the 28 days preceding the sample run.

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

For the August sample run, most water quality parameter measurements at Upper Basin sites were consistent with water of high quality. The level of Lake Fork was recorded at 402.37 feet msl with 64 cfs releases and the level of Lake Tawakoni was recorded at 437.12 feet msl with 5 cfs releases at the time of sampling. LT23D did not meet the stream standards numeric criteria for pH. This site along with LT23A, LT23C, LF2, LF3, LF4, SR19 and SR10 also had high levels of dissolved oxygen with greater than 100 percent dissolved oxygen saturation. Elevated dissolved oxygen levels with greater than 100 percent dissolved oxygen saturation indicate algal bloom conditions. These conditions may also lead to elevated pH levels. No sites exceeded the stream standards numeric criteria for E. coli.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The August monthly sampling results were indicative of water of high quality at most sites. No rainfall was measured during the seven days prior to sampling. The level of Toledo Bend Reservoir was recorded at 170.50 feet msl with 204 cfs discharge at the time of sampling. All reservoir stations were stratified, with pH and dissolved oxygen differences throughout the water column as well as anoxic conditions at the deepest depths. Station TB6R had elevated pH and dissolved oxygen percent saturation indicating an algal bloom.

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 trace amounts of rainfall during the week prior to the sample run. All of the sites in this section of the Basin showed some stratification, with one site showing anoxic conditions at its deepest depths. Surface salinities were found at all but two tidal stations. The highest salinity value of 15 ppt was found at station SRT1C at a depth of 11.2 meters. All the parameters measured in the tidal section of the Basin were within stream standard criteria.

 

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 Monday, February 14, 2005 at 08:40