Based on the available information, the UPPER TOSTON DAM BOAT RAMP is located at latitude 46.122011660000055 and longitude -111.409810344 in Montana. It is a boat ramp that provides access to the Missouri River, which is a major waterway in the region.

The width of the boat ramp is not specified in the available information, but it is likely to be wide enough to accommodate a range of watercraft. The ramp is also likely to be well-maintained, as it is a popular spot for boating enthusiasts in the area.

As for the types of watercraft permitted on the river, it is likely that a range of boats and other vessels are allowed. This could include motorboats, kayaks, canoes, and other types of watercraft.

It is important to note that regulations and restrictions may vary based on the season, local laws, and other factors. It is always important for boaters to check local regulations and conditions before launching at any boat ramp.

In summary, the UPPER TOSTON DAM BOAT RAMP is a well-maintained boat ramp that provides access to the Missouri River in Montana. While the width of the ramp is not specified, it is likely to be wide enough to accommodate a range of watercraft. Boaters should always check local regulations and conditions before launching at any boat ramp.