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Caption: This temperature graph shows minimum, maximum, and average water temperatures in North Fork Battle Creek at Wildcat Diversion Dam in 1996. Thresholds shown on the graph above are for the egg life history stage before July 1 for winter chinook and after September 15 for spring chinook eggs and for holding adults spring chinook during summer. Although average daily water temperatures exceeded stressful (58 F) for incubating eggs of winter-run chinook salmon, stressful temperatures were not sustained and egg mortality would have been low. Stress for adult spring chinook begins when average temperatures exceed 61 degrees F. Again stressful temperatures were not sustained, although the warmest periods in late summer were not recorded in 1996. Increased flows are calculated to further improve conditions for both winter run and spring run chinook in this reach. See Info Links for more information on temperature thresholds.
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