Based on the available information, the boat ramp located at 446th Avenue in Codington County, South Dakota is a public boat ramp that provides access to a body of water that has not been specified. However, using the provided latitude and longitude coordinates, it is likely that the boat ramp services the nearby Lake Kampeska.

The width of the boat ramp has not been specified, but it is likely that it can accommodate a range of watercraft sizes. As with most public boat ramps, it is likely that the ramp is designed for use with a variety of boats, from smaller personal watercraft to larger fishing and recreational boats.

To verify the accuracy of this information, it is recommended to consult with local authorities or check the official website for the South Dakota Game, Fish, and Parks Department, which provides detailed information on all public boat ramps in the state.