Based on the latest information available, the boat ramp named State Highway 42 9930 in Ephraim, Wisconsin is a concrete boat ramp with a width of 20 feet. It services the waters of Eagle Harbor, which is a small harbor located on the eastern shore of the Door Peninsula in Lake Michigan. According to the Wisconsin Department of Natural Resources, the ramp is suitable for launching small boats, canoes, and kayaks. However, it may not be suitable for larger watercraft due to the limited space and shallow waters in the harbor. It is important for boaters to check the latest regulations and guidelines before launching their boats to ensure safety and compliance.