Dewitt Marine is Northern Michigan’s premier full-service marina. Located at the mouth of Clam River on Torch Lake, Dewitt Marine is your destination for all your boating needs. Providing boat rentals, service, repair, and new and used boat sales, Dewitt Marine can make your Northern Michigan boating experience one to remember. Of course, no boat trip to Clam River or Torch Lake would be complete without a stop at The Clam Shack. Purchase gas for your boat and load up on snacks, drinks and suntan lotion for your day on the water.