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Middle Bass Island State Park is an Ohio State Park in Middle Bass, Ohio that is accessible by ferry from May 1 to about October 15. The island was home to a winery before Middle Bass Island State Park was established in 2001. The Lonz Mansion on the island was restored in 2024 and is now a living history museum and inn. The park has a marina and natural areas including wetlands, woodlands, glacial grooves, and shoreline along Lake Erie. The park includes a store and eatery and offers fishing, picnicking, biking, hiking, bird watching, historic sights, geologic features, primitive camping, cycling, a playground, and restrooms. Ohio has sought a winery operator for the property. Once outside the park, the island has an airport, post office, stores, eateries, and vacation rentals.