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Keoka High-Resolution Temperature Monitoring

A. The water column of Keoka Lake was weakly stratified when sensors were deployed in early May. Shallower waters gradually warmed throughout May before a short cool down in early June. Deep waters stayed cold but warmed slightly in early June.
B. Surface water temperature increased steadily from mid-June throughout July with peak temperature occurring on July 29 (28.1°C/ 82.5 °F). Deep waters began to slowly and slight warm but stayed consistently cold.
C. Surface waters began cooling slightly throughout August before reaching near peak temperatures in early September. Due to sensor failure, data describing water temperatures at 9m is absent from late August through November. We used data collected during regular water monitoring visits to supplement sensor data at that depth.
D. Shallow waters began to cool and mix with waters from the middle depths. Deep waters were still cold but had started to warm more rapidly than earlier in the year. The decrease in temperature difference between shallow and deep waters is a precursor to fall turnover.
E. Temperatures throughout the water column were becoming more uniform but temperature differences in the deep waters indicate that full mixing had not yet occurred when sensors were retrieved in early November.

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