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Alcatraz Escape — Part 5

120 pages · May 08, 2026 · Document date: Jan 20, 1962 · Broad topic: Prisons & Escapes · Topic: Alcatraz Escape · 118 pages OCR'd
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1 . aw ~~’ 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 pricr to 3:00 a.m. the tide would be flowing toward the Golden Gate in a westerly direction, and Subsequent to 3:00 a.m. would be flowing towards Berkeley, California, and Richmond, California, in an easterly direction. On June 12, 1962, the follo:ing information was received from the U. S. Engineer's Office at Sausalito, California, where there 18 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. io a EE advised that a free floating object entering the water after pem. on June 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. a. 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: 25 a.m.,on June 12, 1962 - High water, 8:43 Me, On June 12, 1962 Maximum ebb current ~- 2.7 knots at 11:46 p.m. on June 11, 1962 Maximum flood current - 1.8 knots on June 12, 1962 490
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