Selvick Marine Towing, Sturgeon Bay, WI
Shepard Marine Construction Co., Roseville, MI
Shoreline Contractors Inc., Wellington, OH
Shoreline Sightseeing Co., Chicago, IL
Sixth Great Lake Marine Services, Penetanguishene, ON
South Shore Dredge & Dock Inc., Lorain, OH
St. James Marine Co., Beaver Island, MI
St. Lawrence Marine & Dredging Ltd., Lansdowne, ON
St. Lawrence Seaway Development Corp., Massena, NY
St. Lawrence Seaway Management Corp., Montreal, QC
