The sweep boat evolved from the big rafts used in the early days on the Mississippi. Nearly a hundred years ago, the Sweepboat was refined for use along the Salmon River in Idaho to haul supplies and mining equipment down whitewater.
It’s a 23 foot raft capable of taking 16 passengers on leisurely tours. Giant oars called “sweeps” control the direction of travel. It is equipped with a small motor for keeping time schedules and combating upriver wind.