After researching the Banks River Access boat ramp in Idaho, it appears that it is located on the South Fork of the Payette River. This boat ramp is a concrete, single-lane ramp that is suitable for small boats and watercraft.

The Banks River Access boat ramp is approximately 10 feet wide, which may not be suitable for larger boats. However, it does have a small turnaround area at the end of the ramp for easy launching and retrieval of watercraft.

As for the type of watercraft allowed on the South Fork of the Payette River, it appears that small motorized boats, canoes, kayaks, and rafts are permitted. The area is known for great fishing opportunities, and anglers can often be found fishing for trout and other species in the river.

It is important to note that the information provided is accurate to the best of our knowledge at the time of writing, but it is always wise to consult with local authorities or official sources to verify information before heading out on the water.