Ok. Here's a couple of the one that's on my commute route, one during bad weather, the other after.
The Fanno Creek Trail during the flood of '09
The Fanno Creek Trail after a minor flood in '10
You can see in the distance of the "after" image, someone from the Tigard Public Works Dept. is shoveling the muck out.
This trail floods just about any time we get a good rain.