Based on the latest information available, the Fall River County boat ramp in South Dakota is a concrete ramp that provides access to the Angostura Reservoir. The width of the ramp is not specified, but it is said to be suitable for smaller boats.

The Angostura Reservoir covers an area of approximately 4,407 acres and is known for its excellent fishing opportunities, particularly for walleye, smallmouth bass, and crappie. The reservoir also offers opportunities for boating, waterskiing, and swimming.

According to the South Dakota Game, Fish, and Parks website, motorized watercraft are permitted on the reservoir, including boats with gas, diesel, and electric motors. However, personal watercraft such as jet skis are not allowed on the reservoir.

It is important to note that rules and regulations related to boating and watercraft can change over time, so it is always a good idea to check for any updates or changes before heading out on the water.