Redwood

'mnktodave' provides:

Put-in at a small bridge on a gravel road, south of the town of Russell, and paddle through Camden State Park, to the take-out at the River Street bridge, in the town of Lynd.

This is a much narrower section of river, has a lot of class 1-2 rapids, and the rapids are found mostly from the town of Russell, through Camden State Park. (A really fun run with big waves, at high water). If you can catch it...