Jeff,
I dig the idea, and I have had a similar idea in the past. The beginning of it was what I called favorite runs. If you click the
Settings button at the top of the page when your logged in then scroll down you will see in the personal page area that there is a tool called favorite runs. Check it out. Very similar. I was going to build on that and turn it into a riverlog but it really never got used so I did not elaborate on it much.
As it is now you can make personal river lists and bookmark flows that your trying to zone in on. In a few minutes there will also be NWRFC's added to this favorites tool just like the homepage, request of D1.
Rally some support for your cause and I will give you the tool in your liking!
J