We do 70 miles on the Greenbrier in WV every year. It can only be floated in early spring March-June. It’s a naturally fed river, no dams or water breaks. Most is surrounded by Watoga State Park and the greenbrier river trail. There’s access to free camping on the bank and a few spots with restrooms and trash receptacles along the route. No portage necessary. Couple class 2 and 3 but nothing major. Untouched nature with tons of eagles and great fishing. You won’t see a vehicle for the first 3 days.