05-03-2012, 05:16 PM
I'm sorry I haven't measured that before but I know the lower or Johnson bridge has more clearance than the upper so if your okay up top you'll be fine downstream. If you go upstream from the marina you only have to pass the one bridge. I have a 15.5 ft trihull with a 115 hp Merc and I clear with ease if that helps. Later J
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