Notice Not affiliated with the Master Mariners Benevolent Association (MMBA) or any successor organization. v.2026.05
General Overview
Facility 🚤 Full Service Marina Est. Slips ~60 Water Lake Est. Parking ~25 spaces Lot Size Small (<50) Lot Type Surface Confidence High

Medium-sized marina with multiple parallel docks holding boats, a small purple-roofed building, and a compact surface parking lot with a few vehicles near the shore.

Aerial view of Lonz Marine Harbor
Great Lakes

Lonz Marine Harbor

Middle Bass, OH

Lonz Marine Harbor is situated on Middle Bass Island, a small island in Lake Erie, one of the Great Lakes, off the northern coast of Ohio in the Lake Erie Islands archipelago. It serves recreational boaters and sailors navigating the freshwater waters of Lake Erie, providing access to the island's natural surroundings and nearby island-hopping routes in this popular Great Lakes region.

Location Middle Bass, Ottawa County, Ohio
Capacity ~60 slips
Coordinates 41.6754, -82.8088

Nearby Marinas in Ohio

Marina Parking & Access Control

Marinas typically need to separate slip holder parking from day-visitor parking, trailer areas, launch ramps, and secure dock access points. Modern facilities use barrier gate systems to enforce these zones automatically — allowing permitted vehicles through via transponder or keycard while logging all access events.