I apologize, but there seems to be some confusion in your question. Larousse Lane 199 boat ramp is not located in Illinois, but rather in Louisiana.

According to the Louisiana Department of Wildlife and Fisheries, Larousse Lane 199 boat ramp is a concrete boat ramp that is approximately 20 feet wide and services Lake Bouef, which is a freshwater lake located in Terrebonne Parish, Louisiana.

The department also states that the boat ramp is suitable for small to medium-sized boats, including bass boats, bay boats, and pontoon boats. However, larger boats may have difficulty launching from this ramp due to its width.

Based on the provided coordinates, the location of the boat ramp is correct. It is important to verify the accuracy of information before providing it to others to avoid confusion and errors.