U.S. Geological Survey
Open-File Report 98-139
Version 1.0

Multibeam Data and Socio-Economic Issues in West-Central San Francisco Bay

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Reconstruction of San Francisco Bay Floor as of 1894

This a simplified view of the dump site (yellow circle) south of Alcatraz Island based on surveys that showed a hole in the bay floor 50 meters (165 feet) deep in the area in 1894. This is approximately the natural morphology of the bay floor prior to dredge disposal operations. The vertical exaggeration of the island is 2x and of the submerged features is 10x. The gray mesh is 300 x 300 feet (91 meters).

• Alcatraz Dump Site, present-day (120 kb)
• Alcatraz Dump Site, 19?? (computer-generated) (110 kb)
• Alcatraz Dump Site, 1894--prior to dumping (100 kb)
• Profile of sediment accumulation at Alcatraz disposal site (51 kb)

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