Unfortunately, there seems to be some confusion in the question as it mentions both Illinois and Chassell Township, which is actually located in Michigan. Therefore, I cannot provide accurate information about the US 41 boat ramp in Chassell Township, as it does not exist in Illinois.

However, I can provide general information about boat ramps and how to find accurate information about specific ramps. Boat ramps can be made of concrete, asphalt, gravel, or other materials, and vary in width depending on their location and intended use. They provide a convenient access point to launch and retrieve boats from a body of water.

To find accurate information about a specific boat ramp, it is best to check with local government agencies or organizations that manage the waterway where the ramp is located. For example, in Michigan, the Department of Natural Resources (DNR) manages many boat ramps and provides information about their location, amenities, and permitted watercraft. The DNR website also offers a searchable map of boat access sites in Michigan.