According to the Michigan Department of Natural Resources, the boat ramp named Lake Ponemah is located in Genesee County, Michigan, at latitude 42.81635666 and longitude -83.73176575. It is a concrete boat ramp with a width of 18 feet and a length of 125 feet. The ramp provides access to Lake Ponemah, a 358-acre lake in the Shiawassee River watershed.

The lake is open to all kinds of non-motorized boats such as canoes, kayaks, and paddleboards. Motorized boats are also allowed on the lake, with a 10 horsepower limit. The lake is popular for recreational activities such as fishing, boating, and swimming.

It is important to note that the information provided is accurate as of the time of writing, but it is always recommended to check with local authorities for any updates or changes in regulations.