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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Rocks on the Floor of San Francisco Bay - Hazards to Navigation?

Three rock pinnacles--Harding, Shag, and Arch on the floor of west-central San Francisco Bay--lie adjacent to the navigation lanes and rise to potentially hazardous elevations for shipping traffic. The shallowest parts are outlined in yellow. Nearby depressions are outlined in orange.

• View of all three pinnacles (118 kb)
• Morphology of Harding Rock (111 kb)
• Harding Rock modification (110 kb)
• Harding Rock cross-section (32 kb)

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