-AW is an incredible resource, very active on the east coast, a great way to meet paddlers, and a great way to support river conservation (by joining for $33/yr) they sponsor events and do all kinds of work on dam removal and access issues.they fight the good fight for us river rats.
I dont always support charitable Nonprofits, but when I do, it's gonna involve saving the rivers....lol
also as mentioned before you can utilize the river descriptions and flows on their website as a resource for every state nationwide.
btw, you all have A TON of great rivers in the E/SE! year round paddling in some spots. I live in NM, and we have only a handful of creeks, and two good rivers. believe it- you got options
how about the Potomac below great falls or the James river in VA?
Mather gorge & Little Falls are both III, III- on the Potomac right in DC.
(edit): i just looked em up in my copy of this book>>>
the River Gypsies Guidebook to NA-
Although it's primarily the really (really) hard stuff in each region, it has some class III classics, and a lot of area beta for the whole country. maps,directions, drainages and camping, etc...and they are from the East coast.
through AW you can find Paddling clubs, festivals and instruction in your area, as well as swiftwater rescue classes. (a really good idear if you love being on the river.)
Use it, join it, love it....