Reuters: Hundreds of spring Chinook salmon have been found dead in Oregon rivers over the past week, in a sign that abnormally high water temperatures are taking a toll on the threatened species, wildlife officials said on Friday. Low snowpack linked to a historic drought has prevented icy-cold runoff from entering rivers as normal this year, according to federal hydrologists. Temperatures in the Willamette River, a tributary of the Columbia River, have risen from 70 degrees Fahrenheit (21 Celsius) to 75...