To: Interested Parties

From: Water Resources Branch

RE: June 2005 monthly Water Quality Report

This is the Sabine River Authority Water Quality Report for June 2005. Water quality sampling was performed June 13th through June 16th. Recent weather (previous seven days) in the Sabine River Basin was warm, with daytime highs from the upper 80s to the mid 90s at Lake Tawakoni and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs from the low 80s to the lower 90s. Lows ranged from the upper 60s to the mid 70s at Lake Tawakoni and at Lake Fork. Toledo Bend and Orange had lows ranging from the mid 60s to the low 70s. The waters of Lake Tawakoni and Lake Fork were thermally stratified. During the 28 days prior to the sample run, the Upper Basin received 1.89 and 0.77 inches of rainfall as recorded at Lake Tawakoni and at Lake Fork, respectively. Lake Tawakoni and Lake Fork respectively received 0.44 and 0.02 inches of rainfall the week preceding the sample run. Toledo Bend and Orange both received 4.5 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 Upper Basin sites were consistent with water of high quality. The level of Lake Fork was recorded at 402.23 feet msl with 64 cfs releases and the level of Lake Tawakoni was recorded at 435.79 feet msl with 6 cfs releases at the time of sampling. Several Upper Basin sites were beginning to show the effects of a dry spring season on water quality. Station LF3 exceeded the Stream Standards numeric criteria for pH while exceeding 100 percent saturation for dissolved oxygen along with Station LF4. Stations SR22 and SR21 fell below the Stream Standards numeric criteria for dissolved oxygen, and Stations. LT23A, SR22, and SR19 exceeded the recommended screening criteria for chlorophyll a. High chlorophyll a levels in conjunction with dissolved oxygen saturation values exceeding 100% often indicates algal bloom conditions. Stations SR21 and SR19 exceeded the Stream Standards numeric criteria for E. coli and Stations. LT23D and SR14 exceeded the recommended screening criteria for Ortho-phosphate.


Lower Sabine Basin Including Toledo Bend to Morgan Bluff

The June monthly sampling results were indicative of water of high quality at most sites. The area received two inches of rain during the week of sampling. The level of Toledo Bend Reservoir was recorded at 169.07 feet msl with 204 cfs discharge at the time of sampling. Most reservoir stations were stratified with dissolved oxygen and pH differences throughout the water column and anoxic conditions were found at several of the deepest lake stations. Stations TB8, TB7A, TB6K, and TB6LN had a dissolved oxygen percent saturation above the recommended screening criteria. Stations TB7A, TB6LN, TB6K, and TB6F had pH values above the Stream Standards numeric criteria. Several of the stations with elevated pH readings also were supersaturated at the surface. These factors together potentially indicate an algal bloom on the reservoir. Station TB6R also displayed a chlorophyll a result above the recommended screening criteria.

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. Tidal stations received just over 0.8 inches of rainfall the day of sampling. All stations in this section of the Basin showed some stratification, with one station showing anoxic conditions at its deepest depths. Surface salinities were found at Stations ICW1, BB1, SRT1A, and SRT1. The largest salinity value, 12 ppt, was found at Station SRT1C at a depth of 11.4 meters. Station BB1 was below the Stream Standards numeric criteria for dissolved oxygen.

 

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 Wednesday, November 30, 2005 at 14:31