This is the Sabine River Authority
Water Quality Report for October 2003. Water quality sampling was performed
October 13th through October 16th. Recent weather (previous
seven days) in the Sabine River Basin was warm, with daytime high air
temperatures from the mid 70’s to the mid 80’s at Lake
Tawakoni and at Lake Fork.
Toledo Bend Reservoir and Orange
had daytime highs from the mid 70’s to the mid 80’s. Lows ranged from 62°F to 68°F at Lake
Tawakoni and from 60°F to 67°F at Lake Fork. Toledo Bend and Orange had lows ranging from the low 40’s to
the low 70’s. The deeper reservoir sites
remained thermally stratified. During
the 28 days since the September sample run, the Upper
Basin received 0.76 and 1.83 inches of
rainfall as recorded at Lake Tawakoni and Lake Fork,
respectively. The week prior to the
sample run, Lake Tawakoni
received 0.41 inches and Lake
Fork received 0.31 inches
of rain. Toledo Bend and Orange received 1.83 and
6.8 inches, respectively, during the 28 days preceding the sample run.
Upper Sabine Basin
Above Toledo Bend Including Lake Fork
and Lake Tawakoni
October sample run, most parameter measurements at Upper Basin
sites were consistent with water of high quality. Orthophosphates at LT23D were above screening
levels. SR10 exceeded the stream
standards numeric criteria for chlorides.
All Upper Basin sites were within the stream standards
numeric criteria for E. coli.
Lower Sabine Basin
Bend to Morgan Bluff
The October monthly sampling results were indicative of water
of high quality at most sites. The last
significant amount of rainfall the area received was three days prior to the
sample run. The level of Toledo Bend
Reservoir was recorded at 166.28 feet with no discharge from the spillway or
the generator at the time of sampling.
Stratification was present at all lake sites, and anoxic conditions were
only present at the deepest depths at several of the deep-water stations. Station TB6R had a pH level that was above
the stream standard, a high dissolved oxygen with supersaturation at the
surface, and very good transparency. The
high dissolved oxygen and supersaturation at the surface are indicative of an
algal bloom at TB6R, the probable cause of the high pH result.
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 last significant rainfall the area
received was six days prior to sampling.
The area received over three and a half inches of rain during this
event. Most sites in this segment of the
Basin showed some signs of stratification with slight oxygen differences
throughout the water column. Anoxic
conditions were found at only one tidal station. Surface salinity was found at all but the two
most northern tidal stations. Among the stations with surface salinity, the
salinity values ranged from 1.0 ppt at station SRT1b to 4.0 ppt at stations
SRT1, SRT1a, and BB1. The highest
salinity, 12.0 ppt, was found at station SRT1, the most southern site on the Sabine River, at the deepest depth measured. All parameters measured at the tidal sites
were within the stream standards set for this section of the Basin.
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