This is the
Sabine River Authority Water Quality Report for November 2003. Water quality
sampling was performed November 3rd through November 6th.
Recent weather (previous seven days) in the Sabine
River Basin was warm, with daytime
high air temperatures from the mid 70s to the upper 80s at Lake Tawakoni
and at Lake Fork. Toledo Bend Reservoir and Orange had daytime highs
from the upper 50s to the mid 80s. Lows
ranged from 47°F to 68°F at Lake
Tawakoni and from 47°F to 59°F at Lake Fork. Toledo Bend and Orange had lows ranging from the upper 30s to
the mid 60s. Only the deepest reservoir
sites have weak thermal stratification present.
During the 28 days since the October sample run, the Upper Basin
received 0.41 and 0.31 inches of rainfall as recorded at Lake
Tawakoni and Lake Fork,
respectively. The week prior to the
sample run, Lake Tawakoni
and Lake Fork both received no rain. Toledo Bend and Orange received 2.06 and 4.26 inches,
respectively, during the 28 days preceding the sample run.
Upper Sabine Basin
Above Toledo Bend Including Lake Fork
and Lake Tawakoni
November sample run, most parameter measurements at Upper Basin
sites were consistent with water of high quality. Dissolved oxygen levels at LT23C and SR10
were at or just above 100% saturation, indicating algal activity. Orthophosphates at LT23D were above screening
levels. Chloride levels at SR11 were slightly
above stream standards. All Upper Basin
sites were within the stream standards numeric criteria for E. coli.
Lower Sabine Basin
Bend to Morgan Bluff
The November monthly sampling results were indicative of
water of high quality at most sites. The
last significant amount of rainfall the area received was seven days prior to
the sample run. The level of Toledo Bend
Reservoir was recorded at 165.96 feet with no discharge from the spillway or
the generator at the time of sampling.
Stratification was present at all the lake sites, and anoxic conditions
were only present at the deepest depths at one of the deep-water stations. Stations TB6R, TB6LN, TB6J, TB6K, and TB6Q
had pH levels that were above the stream standard, high dissolved oxygen
readings with supersaturation at the surface, and very good transparency. The high dissolved oxygen and supersaturation
readings at the surface indicate an algal bloom which may cause elevated
pH. Station TB7A also had Chloride and
Sulfate results that were above the stream standard.
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 last significant rainfall the area
received was over a week prior to sampling.
Most sites in this section of the Basin showed some signs of
stratification with slight oxygen differences throughout the water column. No anoxic conditions were found at any tidal
station. Surface salinities were found
at all but the most northern tidal station. Among the stations with surface
salinity, the salinity values ranged from 2.0 ppt at station SRT1C to 7.0 ppt
at station SRT1. The highest salinity,
16.0 ppt, was found at station SRT1B at the deepest depth measured. All parameters from the tidal sites were
within stream standards.
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
Lower and Tidal Sabine
Jerry Wiegreffe, Lower Basin Field Office Coordinator
If above are unavailable
John Payne, Special Projects Administrator
Miles Hall, Resource Management/ Project Development