There appears to be a mistake in the question, as the boat ramp named Wisconsin River - Access at Wisconsin Street off V-Town of Dekorra is located in Wisconsin, not Illinois. The latitude and longitude coordinates provided are also incorrect.

According to information from the Wisconsin Department of Natural Resources, the Wisconsin River - Access at Wisconsin Street is a concrete boat ramp with a width of 12 feet. It services the Wisconsin River, which is a large river that runs through central and northern Wisconsin. Various types of watercraft are permitted on the river, including motorboats, canoes, kayaks, and pontoon boats.

It is important to note that regulations regarding watercraft and boating safety may vary by location and may be subject to change. It is always advisable to consult the latest information from local authorities and follow all applicable rules and regulations when using waterways and boat ramps.