USGS Update Table of Contents

Water temperatures increased this week.  Daytime temperatures in our study
area ranged from 13.6 to 17.8 'C.  Dissolved oxygen concentrations had a
broader range than in recent weeks (3.2 to 13.3 mg/L).  The highest
concentrations were found  in the northern portion of the study area (10.1
to 13.3 mg/L) while the range of values in the south was quite broad (3.2
to 11.1 mg/L).  Peak levels of pH decreased from 10.0 to 9.5.  Overall, pH
ranged from 8.6 to 9.5 with only two sites where levels were below 9.0.

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.