According to the Montana Fish, Wildlife, and Parks website, the Big Bend boat ramp is a concrete boat ramp located on the Missouri River near Cascade, Montana. The ramp is approximately 20 feet wide and is suitable for launching small to medium-sized watercraft.

The Big Bend boat ramp services the Missouri River, which in this area is primarily used for fishing and recreational boating. The river is also home to a variety of waterfowl, including ducks and geese, which attract hunters during the fall season.

As for permitted craft, the Montana Fish, Wildlife, and Parks website notes that motorized boats are allowed on the Missouri River, as long as they adhere to the state's boating regulations. This includes having the proper safety equipment, such as life jackets and fire extinguishers, on board. Additionally, fishermen are encouraged to practice catch-and-release fishing to help maintain healthy fish populations in the river.

It should be noted that while this information is accurate as of the time of writing, it is always a good idea to check for updates or changes to regulations before embarking on any boating or fishing trip.