Figure 28. Computed progression of Accumulated Thermal Units (ATUs) for selected model scenarios, showing the different likely rates of egg incubation over the autumn months, North Santiam River, Oregon. Spring Chinook salmon are likely to hatch when the ATU reaches 1,750 degrees Fahrenheit-day. (“_max” is max temperature target, “_w/o_dams7dADM” is the 7-day moving average of the daily maximum of the without-dams temperature target.)

First posted October 30, 2012

Revised June 11, 2013