Notice Not affiliated with the Master Mariners Benevolent Association (MMBA) or any successor organization. v.2026.05
General Overview
Facility 🛶 Small Dock Est. Slips ~15 Water River Confidence High

Small riverside dock facility with several boats moored along a straight canal-like waterway, surrounded by scattered buildings and agricultural fields, no visible parking lot.

Aerial view of Thomas Marina
Great Lakes

Thomas Marina

Akron Township, MI

Thomas Marina is located in Akron Township, Michigan, along the shores of Saginaw Bay, an arm of Lake Huron in the Great Lakes region, offering a scenic setting amidst Michigan's Thumb area with access to freshwater expanses. It serves recreational boating and sailing enthusiasts navigating the waters of Saginaw Bay and Lake Huron, catering to activities like freshwater cruising and fishing in this inland bay environment. This marina provides a gateway to the broader Great Lakes system for boaters based in southeastern Michigan.

★★★★★ 4.7 (33 reviews on Google) View on Google Maps ↗
Address 5066 Thomas Rd, Unionville, MI 48767, USA
Capacity ~15 slips
Hours
Monday: 8:00 AM – 3:00 PM
Tuesday: 8:00 AM – 3:00 PM
Wednesday: 8:00 AM – 3:00 PM
Thursday: Closed
Friday: 8:00 AM – 3:00 PM
Saturday: Closed
Sunday: Closed
Coordinates 43.6987, -83.5500

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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.