The Put-In is where you access the river. The Reach is a term used to describe a section of the river. The reach you select will be defined by your put-in and take-out locations. Each reach has its own beauty and challenges.
A chart of the mileage between river accesses may be found here.
Remember that river travel is not strictly a miles-per-hour undertaking since different reaches have different flows and impediments.
Last Updated: 04/19/2015