San Francisco Bay contains several geographic features that were formerly islands, rocks or reefs but which no longer exist, either because they have been reduced far below the mean low-water mark to remove hazards to navigation, or because they have been joined to the mainland due to infill and siltation.
Arch Rock edit
Shag Rock edit
Shag Rock was actually composed of two separate obstructions, which were often given the names Shag Rocks No. 1 and No. 2.
Shag Rock No. 1 edit
Shag Rock No. 2 edit
Harding Rock edit
Mission Rock edit
Mission Bay Rock edit
Anita Rock edit
Blossom Rock edit
Reef Rocks edit
Inner Reef Rock edit
Outer Reef Rock edit
Centissima Reef and Sears Rock (outside the bay) edit
Centissima Reef is the reef which surrounds Sears Rock west of Rodeo Beach in the Pacific Ocean off Marin County, California.[1] Some early reports refer to Centissima Rock and Sears Rock as separate sub-surface navigation hazards, but present-day nautical charts show Sears Rock as part of the larger Centissima Reef.
A 1908 report on San Francisco Bay stated that a survey was then in progress to investigate the cost of removing both Sears Rock and Centissima Reef, along with Mission Bay Rock and Sonoma Rock, near Mission Rock in San Francisco Bay.[2] In 1922, Representative Julius Kahn told a congressional committee that neither Sears Rock nor Centissima posed a navigation hazard as they had been blasted several years previously: "They are not visible, neither of them. ... [Centissima Rock] is practically at 40 feet. It is a little below the channel, a little south of the channel."[3]
Albany Bulb edit
References edit
- ^ USGS
- ^ Luther, Wagoner; Heuer, William Henry (1908). San Francisco Harbor, its Commerce and Docks: With a Complete Plan for Development, being the Report of the Engineers of the Federated Harbor Improvement Associations. Britton & Rey. pp. 9–10. Retrieved 7 February 2012.
- ^ United States. Congress. House. Committee on Rivers and Harbors (February 7, 1922). San Francisco Harbor, Calif: Hearings on the Subject of the Improvement of Entrance to San Francisco Harbor, House of Representatives, Sixty-Seventh Congress, Second Session. Government Printing Office. pp. 4–5. Retrieved February 7, 2012.
Sources edit
- Durham, Edward B. (August 19, 1899), "Proposed Removal of Arch Rock", Mining and Scientific Press, 78 (2041): 204
{{citation}}: Unknown parameter|city=ignored (|location=suggested) (help) - Durham, Edward B. (September 9, 1899), "Proposed Removal of Arch Rock in San Francisco Harbor", Pacific Rural Press, 58 (11): 172
{{citation}}: Unknown parameter|city=ignored (|location=suggested) (help) - United States. Congress. House. Committee on Rivers and Harbors (February 7, 1922). San Francisco Harbor, Calif: Hearings on the Subject of the Improvement of Entrance to San Francisco Harbor, House of Representatives, Sixty-Seventh Congress, Second Session. Government Printing Office. pp. 4–5. Retrieved February 7, 2012.
- Luther, Wagoner; Heuer, William Henry (1908). San Francisco Harbor, its Commerce and Docks: With a Complete Plan for Development, being the Report of the Engineers of the Federated Harbor Improvement Associations. Britton & Rey. pp. 9–10. Retrieved 7 February 2012.
- Report of Survey, San Francisco Bay and Tributaries, California, United States Army Corps of Engineers, San Francisco District, 1974