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Forum: Navigation

14-09-2020, 17:45

Replies: 14

Bridge Clearance

Views: 4,241

Posted By hallejj

Re: Bridge Clearance

Legend has is that a member of the Portland Yacht Club whose air draught was a couple feet too high to go under the Interstate Bridge without halting traffic would nevertheless get through by...

Forum: Navigation

14-09-2020, 17:23

Replies: 14

Bridge Clearance

Views: 4,241

Posted By hallejj

Re: Bridge Clearance

Actually, not yet fully evolved because I still don't know for sure whether the official datum is MHW or MHHW but I'm ok with that because, if it matters, I don't want to be anywhere near there...

Forum: Navigation

14-09-2020, 16:24

Replies: 14

Bridge Clearance

Views: 4,241

Posted By hallejj

Re: Bridge Clearance

Just checked the NOAA chart for Agate Pass and sho' 'nuff there is data for selected locations for both MHW and MHHW. Looks like my original passage that created one of the higher pucker factors of...

Forum: Navigation

14-09-2020, 16:05

Replies: 14

Bridge Clearance

Views: 4,241

Posted By hallejj

Re: Bridge Clearance

I agree with this assuming, as everyone seems to agree, that MHW is the datum for bridge heights reported on NOAA charts. For anyone who cares, I have empirical evidence that, when the tide at Port...

Forum: Navigation

13-09-2020, 22:05

Replies: 14

Bridge Clearance

Views: 4,241

Posted By hallejj

Bridge Clearance

So here is how this question came up for us: the standard route into Poulsbo WA from the north passes through Agate Pass. a narrow channel spanned by a bridge. The NOAA chart and its electronic...

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