Home / Service area / Algonac and Harsens Island
St. Clair River · the Channels
Boat mechanic serving Algonac and Harsens Island
Where the St. Clair River splits around Harsens Island, Brad works the marinas and channel docks on both the mainland and the island.
A river town split by channels
Algonac sits on the St. Clair River across from the north end of Harsens Island, where the river splits into the North, Middle and South Channels before opening into Lake St. Clair. The town's marinas, from the member-run Algonac Harbour Club to the large dealer-run Colony Marine yard, sit right on the main river channel. Out on Harsens Island itself, reached by ferry, docks like Sassy Marina on the Middle Channel and Tashmoo Marina on the South Channel serve the island's own small boating community. Whether you're on the mainland side or out on the island, Brad makes the trip.
Current changes everything
The St. Clair River has a strong, steady current, stronger than most owners coming from lake marinas are used to, and it runs through every channel around Harsens Island as well. That current affects docking, anchoring and how hard a raw-water pump has to work against silt and debris, and it is one of the bigger differences between servicing a boat here versus a still-water lake marina.
What's typical on the water here
This stretch of the St. Clair River sees a wide mix, from small aluminum fishing boats working the channels to larger cruisers passing through toward Lake Huron or down to Lake St. Clair. Harsens Island's channel docks lean toward smaller runabouts and pontoon boats suited to the narrower waterways around the island.
Seasonal timing
Winterizing here needs to account for the current as much as the calendar: boats that stay in the water later into the fall are still exposed to moving, colder water, so Brad plans the fuel, fresh water and engine work with that in mind rather than treating it like a still marina.
Common calls in Algonac and on Harsens Island
Raw-water cooling and impeller work comes up more often here given the current and debris, alongside outboard service for the smaller channel boats and the usual winterizing and spring commissioning cycle. See marine engine repair, outboard repair and boat winterization.
The auto ferry that carries cars between Algonac and Harsens Island runs around the clock, so Brad can time a visit to an island dock the same way he'd plan a stop on the mainland; text ahead so the trip lines up with a crossing.
Not sure why an engine keeps running warm on the river? See the boat won't start guide and the haul-out inspection checklist.
Common questions
Do you work on Harsens Island itself, or just the mainland in Algonac?
Both. Brad takes the auto ferry across to reach docks on Harsens Island the same as he'd drive to a slip in Algonac. Text ahead so the visit can be timed around the ferry crossing.
Does the river current change how a boat is serviced here?
Yes. The St. Clair River runs with a steady current through the North, Middle and South Channels around Harsens Island, which affects docking and puts more load on raw-water cooling systems than a still-water lake marina.
Can you reach a private dock on one of the channels, not just a marina slip?
Yes, private docks along the channels are reachable the same as marina slips, current and access permitting. Text the address or the nearest marina and Brad will confirm.
When should winterizing be booked on the river?
As soon as you know your haul-out date. Moving river water gets cold and behaves differently than a still marina basin, so it's worth not waiting for the last open date on the calendar.
Nearby: Brad also covers Marine City and Anchor Bay.
Boat trouble in Algonac or Harsens Island
Text a photo of the problem and which channel or marina you're at.