Got a little hairy yesterday on the Mississippi on Pool 8. Came out of the lock and dam at Dresbach and as we crossed under the I-90 bridge things got very turbulent. Took a couple big rollers over the front, Pushed me out of the channel and over a wing dam and took out my prop as well. Top gust measured at the airport was 44MPH. Granted it was a little windy to start with, but ramped up to ludicrous level in an instant. You know it was bad when the guy running the lock remembers you a few hours later on your return passage. Luckily I carry some tools and a spare prop. Return trip was smoother.