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Alcatraz Escape — Part 5
Page 48
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TIDES AND CURRENTS
Cn June 12, 1962, information was received that the
tide charts of San Francisco Bay for this date reflected that
for the six-hour period prior to 3:00 a.m. the tide would be
flowing pward the Golden Gate in a westerly direction, and
subsequen’ 3:00 a.m. would be flowing towards Berkeley,
California, toa Richmond, California, in an easterly direction.
On June 12, 1962, the following information was received
from the U. S. Engineer's Office at Sausalito, California, where
there is a mockup of the Bay:
On June 11, 1962, at 10:00 p.m., there was a slack
tide which meant the water was moving in neither direction.
Shortly after 10:00 p.m. the water started to flow out of the
Bay; reaching its peak velocity at midnight and then tapered off:
to slack tide again at 4:00 a.m. ‘The speed at midnight was
approximately 2.7 knots, while at 10:30 to 11:00 p.m. the speed
was about two knots. After 4:00 a.m., the tide started to flow
back into the Bay. Fe)
a advised that a
free floating object entering the water after -m. on
dune 11, 1962, would flow right out to the ocean under the Golden
Gate Bridge. The reaching of Angel Island would be fairly
difficult because it would be going in a due northerly direction,
cutting across the outgoing tide.
on June 13, 1952, as U. S. Coast bre
Guard, Captain of the Port of San Francisco, advised the tides
during the pertinent period were as follows:
High water, 8:22 p.m., on June 11, 1962 .
Low water, 2: Pa a.m.,on June 12, 1962 -
High water, 8:43 a.m, on June 12, 1962
Maximum ebb current - 2.7 knots at 11:46 p.m.
on June 11, 1962
Maximum flood current - 1.8 Imots at 6:44 a.m.
on June 12, 1962
- 12.
90
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