Based on the provided latitude and longitude coordinates, the Finnegan Lake boat ramp is located in Wisconsin. However, further research did not yield any results for a boat ramp specifically named Finnegan Lake. There are several boat ramps located in Wisconsin that provide access to lakes with "Finnegan" in their name, but without more specific information, it is impossible to determine which one is being referred to.

In general, boat ramps vary in size and width depending on their location and intended use. Some are designed for small personal watercraft, while others can accommodate larger boats. The body of water that a boat ramp services also varies, with some providing access to lakes, rivers, or even the ocean.

The types of craft permitted on the water will depend on local regulations and any specific rules or restrictions for the particular body of water. It is important to check with local authorities or the managing agency for the specific lake or waterway for any applicable rules and regulations.

Without more specific information, it is not possible to accurately describe the Finnegan Lake boat ramp or its characteristics.