Colville River Mouth. The Colville River enters the Columbia River at Rivermile 100 just south of Kettle Falls, WA. Its an easy hike...

Locations of fault trenches in Eastern Washington. Trenched faults in the Yakima Fold Belt . Locations of fault trenching investigations by USGS, Washington Geological Survey, DOGAMI, USBOR, and others. Most trenches were excavated in Columbia River Basalt. The Spencer Canyon trench, epicenter of the 1872 North Cascades quake, lies outside the YFB in older crystalline rocks of the Cascade Range. The Gales Creek trench, near Portland, is not shown on the map. Trench studies ha

Exotic clasts in gravel . An exotic clast-bearing conglomerate at White Bluffs Overlook was left by an ancient Ice Age flood. The...