Up to five are to be taken across Washington on the boats . Service is partially a response to the closure of all bridges from Maryland to D.C. Potomac Riverboat Company clears boats to provide service . `` We have to call in on each departure to the Coast Guard , let them know we 're preparing to get under way , and get the permission , basically , to get under way . '' All passengers must arrive at least an hour early for a full screening .
Up to five are to be taken across Washington on the boats . Service is partially a response to the closure of all bridges from Maryland to D.C. Potomac Riverboat Company clears boats to provide service . All passengers must arrive at least an hour early for a full screening .