I'm considering a trip up the hudson from NYC on an Oday 35 (48 ft. clearance needed) to Lake Champlain. My charts show fixed bridges at 20ft vertical clearance above Troy. Am I missing something or is it necessary to take down the mast at this point? Are there marinas along the way with the facilities to do this? Anyone with information about this trip, please respond. I'd like to learn as much as I can about it. My plan would be to do the trip in stages. I would even consider wintering the boat somewhere along the way and return the following season.