Bascule Bridge Raised Vertical Clearance??? - Page 2 - SailNet Community
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post #11 of 15 Old 11-25-2011 Thread Starter
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A bascule bridge is any bridge that can be opened and is not a fixed bridge. The horizontal and verticle clearances is marked on the chart. That is if you have the correct chart for that area.
That's what I thought too and this was the reason for my confusion since the raised vertical clearance is NOT listed on the chart (see the example).

I'm not sure what NOAA's definition is of a bascule bridge (no mention in Chart #1) but every definition that I found is basically "a type of drawbridge consisting of one or two counterweighted leaves which pivot upward on a horizontal axis to allow boat traffic to pass underneath. The counterweights help balance each side of the bridge during the upward swing, which assists in the lifting motion."

All of the examples I have found have an unlimited raised vertical clearance (ignoring wires and structures other than the bridge). For planning purposes, I believe it is appropriate to assume that they have an unlimited raised vertical clearance when not listed otherwise on the chart. Obviously, that will be checked with the bridge operator prior to passing.


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post #12 of 15 Old 11-26-2011
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All of the examples I have found have an unlimited raised vertical clearance (ignoring wires and structures other than the bridge).
And those that have wires above them will note on the chart the minimum clearance under the wires.
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post #13 of 15 Old 12-11-2011
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river goes up and down,it changes all the time
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post #14 of 15 Old 12-11-2011
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I go under one all the time you call tender on channal 16 or call on phone.Or one long and the one short blast on horn
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post #15 of 15 Old 12-11-2011
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Quote:
Originally Posted by gaha View Post
river goes up and down,it changes all the time
true, but bridge and overhead wire clearances are based on "Mean High Water Springs" just as charted depths are based on "Mean Low Water Springs".

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