Death’s Door Marine, a subsidiary of Summerset Marine Construction, specializes in constructing and maintaining safe harbors local boaters can depend on. We provide services ranging from installation of our patented dock designs to dredging to custom marine stone work.

Death’s Door Marine is uniquely capable to handle every aspect of your marine construction needs. We professionally engineer solutions for marine environments AND build what we design. Mike Kahr, Director of Operations, is a professional civil engineer who has been building and designing docks in Door County for more than 30 years. Mike is considered a statewide expert in marine construction and the permitting process for marine structures on Lake Michigan. He holds multiple patents for innovative dock designs, which are designed to be raised, lowered, and fully withstand winter ice.