Idaho has the most white water of any state in the lower 48 with over 16,000 miles of swiftly flowing rivers and streams, and numerous lakes and reservoirs. Major rivers are the Snake, Salmon, Clearwater, Selway, Boise, Coeur d'Alene, and Payette. Major reservoirs are American Falls, Arrow Rock, Dworshak, Cascade, and Palisades. TIME ZONE Idaho is in the Mountain and Pacific Zones and observes Daylight Savings Time from early April to the end of October. Temperatures are moderated by westerly winds from the Pacific Ocean, as well as by the altitude.
Annual precipitation varies with location.
Southern Idaho's yearly rainfall varies from seven to 16 inches and snowfall from 17 to 70 inches.