I found a raft store in Denver that sells a simple, yet effective piece of gear to make a tripod out of oars. In the past I have just used a strap to link the oars together to make a tripod to hang a water filter or game meat when there were no trees available.
This is just 3 rings welded together for $9.95. If you have the equipment it would be easy to make yourself. This will be less of a struggle to make a tripod vs. fighting with 3 oars and a strap all trying to go in different directions. The shop owner talked about using a tripod and a tarp to create a riverside sauna with hot rocks from the firepit. A hot sauna on a cold, rainy day is something that could deffinitely add style points to a river camp. Of course extreme caution must be used when heating rocks!
It's sold by AAA Inflateables of Denver. http://www.aaainflatables.com/Oar-Tr...aaa-tripod.htm
I was in Denver so I just went by and picked it up. If you are interested I'd call them and find a cheaper way to ship this small item vs. UPS 2nd day air. To the best of my knowledge nobody else sells this item.