When I was in high school, one of my all time favourite teachers had this great story (he actually had a million stories, one for any occasion imaginable…). It was about the Rat River Canoe race where after the main race was done, they had a sort of DIY race, where people were challenged to build their own boats, with as unusual a material as possible. The race course was fairly simple, a short trip down the river and then over a small weir… Of course most boats would explode into a million parts upon hitting the weir, but this was all part of the fun. Anyways, the story I remember is that one year, a few guys took a whole bunch of milk cartons, taped them all shut, and then duct taped them together into a large raft. I guess it was one of the better floating boats until they hit the weir, after which they spent hours pulling out individual milk cartons out of the river!
With that in mind, I tried to track down any info about this race. After a brief search I found some races with similar names, but they weren’t in the right area or on the right “Rat River”. Further searches led me to “The Dairy Farmers of Oregon Milk Carton Boat Race” It’s obviously too late to enter, but there are some good pics on “Dave Knows Portland“