Glen did the trip with three generations of Wooldridge's...apparently the great grandpa (deceased founder of the boat company) was the first guy to take a boat down the lower river, and he and his buddies later blasted a few of the nasty sections so you could pass. Can't remember the names of where they blasted, but I know they went through Mule Canyon...that could have been one of the spots. They even had some vintage footage of the old man running a long dory style boat upriver...damn cool.