I apologize, but there seems to be some confusion in the given information. The boat ramp named Kelly Lake is actually located in Wisconsin, not Illinois. It is situated at the intersection of CTH G and Kelly Lake Road, approximately 7 miles northwest of Suring, Wisconsin. The coordinates provided (latitude: 45.0256424, longitude: -88.2193222) also correspond to this location in Wisconsin.

According to the latest available information, the Kelly Lake boat ramp is a concrete ramp that is approximately 14 feet wide. It provides access to Kelly Lake, which is a 174-acre lake located in Oconto County, Wisconsin. The lake is known for its excellent fishing opportunities and is home to a variety of fish species, including walleye, northern pike, largemouth bass, and panfish.

As for the types of watercraft allowed on the lake, the regulations state that any watercraft with a motor must be registered with the Wisconsin Department of Natural Resources. Additionally, there are restrictions on the use of personal watercraft (such as jet skis) on the lake during certain hours of the day.

In summary, the Kelly Lake boat ramp in Wisconsin is a concrete ramp that is approximately 14 feet wide. It provides access to Kelly Lake, a 174-acre lake known for its excellent fishing opportunities. Any motorized watercraft must be registered with the Wisconsin DNR, and there are restrictions on the use of personal watercraft during certain hours.