LEWISTON, Idaho (AP) -- Pacific Northwest water managers are planning to release a pulse of cold water from the Dworshak Reservoir earlier than usual in hopes of cooling water temperatures in the lower Snake River.
Each summer, managers release about 2 million acre-feet of 43-degree water from the reservoir to keep the Snake River cool for juvenile fall chinook and returning adult steelhead.
But the Lewiston Tribune reports the release this year is coming earlier than normal thanks to the recent heat wave. Officials say hot air temperatures are elevating water temperatures in the river system.
The Clearwater River near Orofino reached 76 degrees Tuesday. The Snake river south of Asotin, Wash., hit 71 degrees.
Temperatures in the low 70s are considered unsafe for salmon and steelhead.
Officials began increasing flows Sunday.