Tide times are
often listed in 24 hour time - for
times after , subtract 1200 from the
time to get regular clock time. Ex:
1300 hrs - 1200 = 1:00 pm)
Also, tides are referenced
to Mean Lower Low Water, a reference
point for depth on many nautical
charts. MLLW is the average of the
lower of the two low tides in a day,
over a 19-year cycle.Minus
tides are lower than MLLW.
If you're right on the coast,
subtract an hour from these times.
Upriver, highs and lows happen later.
For instance, in Knappa, add an hour.
In Clatskanie, add 2 hours and 15
blast every two minutes or less: vessel operating
consecutive horn blasts:
warning signal that means literally
"I do not know your intention." This
generally means another vessel is in the way of a ship
in the channel, and is being asked
to move before they collide.
short blasts: Vessel going
long blast followed by three
short: signal for the change of
pilots. Soon after this signal,
you'll see the pilot launch
Arrow II head out to a passing
ship, to facilitate the transfer
of bar and river pilots.
"Pilot transfer" is when a pilot
disembarks or boards a ship. Ships
generally must by law have a river or
bar pilot on board when they are on
the Columbia or Willamette Rivers. The
bar and river pilots have separate
pilotage grounds defined by the Oregon
operated by Columbia
She spent several
months in Astoria in
the fall of both
2008 and 2009,
at the Port of
Astoria. In early
December, she headed
to the shipyard
in Portland for some
She headed back out
to sea in early
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Producer Joanne Rideout is a journalist and
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