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USGS Water Quality and Sucker Distribution Update 9/17/04

Water temperatures continued to drop this week.  Daytime temperatures in
our study area ranged from 14.7 to 17.8 'C.  Dissolved oxygen
concentrations ranged from 6.7 to 10.8 mg/L.  As in past weeks the highest
concentrations are in the northern portion of the study area (7.3 to 10.8
mg/L) and lower in the south (6.7 to 8.2 mg/L) although the difference
between the two areas has been decreasing.  There was an increase in pH
measurements, especially on the high end, with levels ranging from 8.6 to
9.9.  The highest levels continued to be at northern sites in the study

These data are preliminary and are being provided as a qualitative
assessment of lake conditions and fish distributions.  Only daytime
conditions collected by our water quality crews as they visit each
monitoring site in our study area (all of Upper Klamath Lake north of Bare
Island including Ball and Shoalwater bays, but excluding Agency Lake)
during the course of the week are reported.  They are not meant to be
representative of the full range of conditions occurring throughout the day
and night nor representative of conditions in all areas of the lake.




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