Harbour

Colony Marine Algonac

Russell Island, United StatesGreat Lakes
Type
Harbour

Full-service marina and boatyard on the St Clair River at Algonac, near Russell Island in the St Clair Flats delta, Michigan.

Guide

Approach and anchoring

Enter from the St Clair River. The river runs strong here, often 2 to 3 knots southbound, and commercial freighters use the main channel. Stay clear of the shipping lane and approach the docks at slow speed.

Practical

Deep-water berths with shore power and fresh water. Sales and service for Sea Ray, Boston Whaler, Chris-Craft and Prestige. Summer dockage, winter storage and travel lift on site. Family-owned since 1958.

Ashore

Algonac town centre is within walking distance with shops, restaurants and a grocery store. Algonac State Park lies 4 km north along the river with hiking trails and birdwatching over the flats.

Key facts

Type
Harbour
Coordinates
42.63272, -82.61637 (42°37.96'N 82°36.98'W)
Town
Russell Island
Country
United States
Updated
July 7, 2026

Getting there

Colony Marine Algonac lies at 42°37.96'N 82°36.98'W, that is 42.63272, -82.61637 in decimal degrees.

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