Marine shipping executives are calling on government officials to protect the St. Lawrence Seaway trade corridor by working with stakeholders to develop solutions that do not rely on one ineffective dam to solve high-water levels across the Great Lakes. The opening of the navigation season in the Montreal-Lake Ontario section of the St. Lawrence Seaway has been delayed to April 1 to allow more outflow from Moses-Saunders dam to lower Lake Ontario water levels. The Welland Canal will open March 24. The decision has left shippers disappointed with the delay.