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35ft is a relatively shallow shipping channel.
Panamax vessels fully loaded draft close to 40ft. The Delaware shipping channel is being dredged an additional 5ft to produce 45ft at low tide for newer Panamax vessels.
The Very Large Crude Carriers and Ultra Large Crude Carriers draft even more, but are usually lightered in deep water to barges.
Just had a look at SF Bay charts the shipping lanes appear to be all in 60ft + water.
1970 Havsfidra 20 by Fisksatra
On the Delaware River at Fox Grove Marina Essington PA
Last edited by Ulladh; 02-01-2012 at 11:44 AM.