Great Idea,

Here is what we have so far.

And if you go down the rivers page you will see mapplet Icons for rivers that have the features tagged and mapped.

Example for Robe:

Unfortunately because the Maps API keeps changing fewer and fewer browsers work with it and I am no longer developing for stuff like this, just too keep this bag of bones floating.

If you pull up maps.google.com, and get "Directions" (from anywhere, to anywhere, like if you are going on a trip out-of-state) . . .
And then, if you put (into the google-search-bar) http://www.americanwhitewater.org/content/River/state-summary/state/xx/.kml but replacee the xx with the two-character abbreviation for any state along your route, when you click the search-button (or press "Enter"), your travel route stays onscreen, AND the rivers (as listed on AW) will be indicated with colored dots, color-coded for runnable flows (where gauges exist, anyway). And, you can click on a dot, then click on a link to go to the river description.

Want to check out another state along your route? Change the two-character abbreviation to another state, click the button (or press "Enter"), and VOILA! you get the next state's rivers (and your route is still visible)! If you see a river some distance off your route, click+drag+drop on the route-line and Google will reroute to your desired detour (to the river). Doing this will cause the AW river-dots to disappear, but the url will still be in the Google-search bar, so you can click the search button again to show them.

Try it out!

Weird, that Google maps thing worked well not that long ago.  This one still works.http://whitewatermap.com/