Based on the information available, the Black St. Ramp in Combs Park, Ohio is a public boat ramp that provides access to the Great Miami River. It is located at latitude 39.41456985 and longitude -84.55403137.

The boat ramp is reported to be concrete and is said to be 20 feet wide, which is wide enough to accommodate most watercraft. This information is based on user reports and may not be entirely accurate.

The Great Miami River is a popular destination for boaters in the area, and the Black St. Ramp provides access to this waterway. The river is suitable for a wide range of watercraft, including motorized fishing boats, canoes, kayaks, and paddleboards.

It is important to note that regulations regarding the use of watercraft on the Great Miami River may vary depending on the location, so it is essential to verify the rules before setting out on the water. Additionally, it is always advisable to check for updates on the Black St. Ramp, including any closures or changes to the facility, before planning a trip.