After conducting research, it appears that Windy Bay Boat Launch is a concrete boat ramp located on the western shore of Lake Coeur d'Alene in Idaho. The ramp is said to be about 16 feet wide, which should accommodate most small and medium-sized watercraft.

As for the body of water it services, Windy Bay Boat Launch provides access to Lake Coeur d'Alene, which is a large freshwater lake that covers over 30,000 acres and has a maximum depth of around 220 feet. The lake is known for its clear water, sandy beaches, and opportunities for fishing, boating, and other outdoor activities.

Regarding the types of craft permitted on the water, it would depend on the specific regulations and restrictions set forth by the Idaho Department of Fish and Game. However, it is safe to assume that most common watercraft such as motorboats, kayaks, canoes, and paddleboards would be allowed on Lake Coeur d'Alene.

Overall, it seems that Windy Bay Boat Launch is a popular spot for boaters and anglers alike, offering easy access to a beautiful and diverse body of water.