Roger Hayes, There are no fixed bridges on the Hudson at 16.5 feet. The lowest bridges on your route are on the Erie Canal, at 21 feet. If your air draft is 18.5, then you are just fine. A "boom" is a horizontal beam, usually attached to a mast. The vertical post on top your boat, probably with a radar on top, is a "mast". The Skipper Bob book for the NY Canals is available at the Waterford Visitors Center. Be sure you have this year's edition, though the bridges have not changed in a very long time. Best wishes, Fred Tug 44 ---------------------------------------- From: TwinBoat@aol.com Sent: Monday, July 27, 2009 6:25 PM To: great-loop@lists.samurai.com Subject: GL: Hudson River Bridges I am planing a trip up the Hudson and then on to Fonda just past lock 12 on the Erie canal. Skipper Bobs guide says I need to clear 20 feet to make the trip but my chart shows 2 fixed bridges in Albany, that are at 16.5 feet. Am I misreading the charts or has something changed. I am at 18.5 feet right now but the boom was cut some years ago and can be folded if needed. Roger Hayes, Slow Churn 1984 Rosborough RF 35 **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1221823322x1201398723/aol?redir=htt p://www.freecreditreport.com/pm/default.aspx?sc=668072&hmpgID=115&bcd =JulystepsfooterNO115) _______________________________________________ http://lists.samurai.com/mailman/listinfo/great-loop To modify your Great-Loop subscription options (change email address, unsubscribe, etc.) go to: http://lists.samurai.com/mailman/options/great-loop