On Weems Creek in Annapolis, a grandmother operates one of Maryland's last swing bridges from her office tucked under the span. In his Baltimore workshop, a member of the Boulmetis family keeps the tradition of hat making alive in a city that once was among the hat-making capitals of America. Corny and Wilbur Messick of Bivalve will likely be the last of their family to make the graceful wooden tongs that watermen use to harvest oysters. The Day...