Originally Posted by senormechanico
Port Townsend canal bridge clearance listed by several local charts is 60' at MHHW.
I have 53' above water and have never even been close.
Canal Bridge is an entirely different thing.
I went thru the extremely East end at a +1.5 and darn near hit, saved only by sliding thru the high spot between two transverse beams.
AFAIK, it's the only bridge in WA state which measures 50 ft. at the low East end not from MHHW from ZERO TIDE. We found that out only after after going through and calling their phone number. Even the idiot on the state phone number had no idea.
It took several transfers to get to the real information. "Oh, yes, we measure THAT BRIDGE FROM ZERO TIDE, not like all the other bridges in the state..." WTF !!
Coming back out a few days later, we called for a bridge opening.
The Hood Canal bridge is an interesting beast.
NOAA charts show that the east span has a vertical clearance of 50ft and specifically says "at all tide levels". Same with the west span (35ft). Theoretically, at low tides, you should be able to squeeze out a few more feet by hugging the fixed pier/tower at each span (do so at your own risk...)
The "fixed" navigation
spans are coincidal with where the bridge transitions from fixed pier supports to the floating portion. For example, on the east span, the east pier is fixed to the bottom whereas the west pier is floating. The road span itself is "hinged" to the fixed pier to allow for tide changes. This means that at low water, the eastern part of the span has an increased clearance and the western part of the span is more or less always fixed (I've always assumed
that this is where they get the mimimum clearance from and it makes sense that it would be the same there at all tide levels). The middle of the span is somewhere in between. Ditto for the west navigation
span (except there, the west pier is fixed and the east pier floats.
It's been a few years since I've transited one of the fixed spans but I could've sworn they had clearance boards at the water's edge showing the actual clearance at each pier. Maybe not.
Originally Posted by dmksails
I've seen that in a lot of areas you can find back eddies close to shore that you can use when currents are running high in the opposite direction.
Is there a chart or site that would show location and times of current back -eddies in Puget Sound
, or is this developed strictly by local knowledge?
I'm planning my first sail from Elliott Bay to Pt Townsend and am considering what to do related to tide and current.
The following link is to a "Tide Prints" book published by Starpath (using data from NOAA) which graphically shows the current patterns in Puget Sound. It's just a sample though.
There's also this book from 1977 published by URI with similar info, but complete.