Nick and I have met several times in recent weeks near Vantage, WA. We're trying to round up video and photos to build a show featuring geology along Interstate 90 between Seattle and Spokane. The drainage on the other side of the river (above) is Ryegrass Coulee. Several ice-rafted erratics sit in Ryegrass Coulee ... hard to find at 70 mph.
Abby and I were on our way to visit Grandma (Mom) & Grandpa (Dad).
Can you help?
Lahar: Mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris, and water. The material flows down from a volcano, typically along a river valley.Some amazing traveling rocks out here! The lahar near Thorp, WA is really cool. Material flowed to this location from a volcano that no longer exists near White Pass, WA. Obstacles like Manastash Ridge were not in place when the volcano erupted allowing flow from White Pass to Thorp area.