Having a roll is helpful for hard whitewater play and boosts confidence. Your canoe needs to be well bagged and you need to be locked in with thigh straps or machines. Our club in the 80's used to practice open canoe rolls, both solo and tandem, in the Farmington River in Connecticut.
In 1986, I paddled Section IV of the Chattooga and the Ocoee with the legendary Nolan Whitesell. That's how he often sold his boats: He'd make one for you, let you use it on real rivers, and then hope you'd buy it at the end. (I did.) He finished off our Chattooga run by demonstrating on-side rolls, off-side rolls, cross-rolls, and hand rolls in Lake Tugalo. He would do each roll both left-handed and right-handed because he believed in being completely ambidextrous for all paddling strokes and maneuvers. I believe that, too, but my actuality has never been complete.
This video is a good presentation of on-side and off-side solo canoe rolling in an open canoe:
In 1986, I paddled Section IV of the Chattooga and the Ocoee with the legendary Nolan Whitesell. That's how he often sold his boats: He'd make one for you, let you use it on real rivers, and then hope you'd buy it at the end. (I did.) He finished off our Chattooga run by demonstrating on-side rolls, off-side rolls, cross-rolls, and hand rolls in Lake Tugalo. He would do each roll both left-handed and right-handed because he believed in being completely ambidextrous for all paddling strokes and maneuvers. I believe that, too, but my actuality has never been complete.
This video is a good presentation of on-side and off-side solo canoe rolling in an open canoe: