Based on the latest information available, the boat ramp named Lake Michigan is located in Bowers Harbor, Grand Traverse County, Michigan. It has a latitude of 44.89464951 and a longitude of -85.52454376. The boat ramp provides access to Lake Michigan, which is one of the largest lakes in North America and borders several US states, including Michigan.

The boat ramp at Bowers Harbor is a concrete ramp that is suitable for launching small to medium-sized boats. It is approximately 14 feet wide, which provides ample space for launching and retrieving boats. The ramp is also equipped with a parking lot that can accommodate several vehicles and boat trailers.

Given that the boat ramp provides access to Lake Michigan, a wide range of watercraft are permitted on the water. These include fishing boats, sailboats, kayaks, canoes, and motorboats. However, it's important to note that some restrictions may apply depending on the specific area of the lake and the season.

Overall, the boat ramp named Lake Michigan in Bowers Harbor, Grand Traverse County is a convenient and well-maintained facility that provides access to one of the most popular water bodies in the United States. Its wide size and ample parking make it a popular choice for boaters in the area.