Here's a pretty cool video of the Sandy River in Oregon at flood stage that I saw on another forum. Incredible content, and I also like the way this is put together.
http://vimeo.com/18921387
Here is a news story on the event in case you are interested in further info:
http://www.oregonlive.com/weather/index.ssf/2011/01/area_where_sandy_river_flooded.html