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

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

Back to: Dredge Disposal, I  |  Dredge Disposal, II

Present-day San Francisco Bay Floor

This is a view of the bay floor over the dump site (yellow circle) south of Alcatraz Island as it appears today based on the newly acquired multibeam data. The disposal site is now a mound with positive relief above the adjacent bay floor. 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)

Back to: Dredge Disposal, I  |  Dredge Disposal, II