The Willimantic River Paddlers Trail can take you nearly the entire 22.5 miles from Stafford Springs to Willimantic. It was designated a National Recreation Trail in 2012. There is one portage at the Eagleville Dam.
Whitewater – American Whitewater cites two stretches:
1. Eagleville Dam to Bridge Street – Class I-II – This one is a popular flatwater float
2. Bridge St. to the Thread Mill – Class III-IV – A Willimantic group is trying to build a whitewater park here though progress has been slow and given the three dams in this stretch it is currently un-runnable