Mallard II
Mallard II near the Dumbarton Bridge in 2021
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History | |
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Name | Mallard II |
Owner | Cargill Salt |
In service | 1936 |
Status | In service |
Notes | Oldest operating dredge in California |
General characteristics | |
Class and type | Dredger |
Length | 80 ft (24 m)[1] |
Beam | 34 ft (10 m)[1] |
Draft | 7 ft (2.1 m)[1] |
Mallard II is a wooden-hulled
History
Mallard II was built by the Leslie Salt Company (now Cargill) in 1936, and has maintained the levees of the salt ponds ever since,
In 2002, she was used for the
As of 2007, she was the only wooden-hulled
Levees
The levees surrounding the San Francisco Bay Salt Ponds date to the late 1800s, and were mostly constructed to reclaim land for agricultural purposes; the area enclosed by them was later used for salt production.[5]: 45 In addition to their role in operating the salt ponds, the levees protect Bay Area cities like San Jose from being flooded by high tides.[12]
Due to factors such as
A December 2020 permit for a wetlands project issued by the California Department of Fish and Wildlife provided for maintenance of salt ponds to be carried out by the still-operational Mallard II, using the existing system of dredge locks, referred to as "the most technologically and economically feasible method for solar salt production in south San Francisco Bay".[11]: 54 While it would be possible to reduce some of the adverse impacts of levee maintenance (mostly caused by the existence of the dredge lock system) by using a "transportable dredge", it was found that such a dredge would require more frequent refueling (every two weeks, as opposed to every two months with Mallard II), as well as the use of large trucks and cranes to reposition it; Mallard II, therefore, was found to be the "most feasible alternative".[11]: 61 A 2005 estimate of expenses for levee maintenance in the area put the cost of using Mallard II at approximately $50,000 per month.[15]
References
- ^ a b c d e "Leslie Salt Co. Dredge Repaired". The Napa Valley Register. Napa, California. 1954-12-30. p. 2.
- ^ Benton, Cris (30 September 2005). "The Mallard II". Hidden Ecologies. University of California Berkeley. Archived from the original on 9 July 2021. Retrieved 6 July 2021.
- ^ "Staff Report: Salt Ponds" (PDF). San Francisco Bay Conservation and Development Commission. October 2005. Archived (PDF) from the original on 2021-07-09. Retrieved 2021-07-06.
- ^ a b Krause, John (2007). "2007 Self-Monitoring Report: Baumberg Complex – Hayward, California, Eden Landing Ecological Reserve" (PDF). California Department of Fish and Game.
- ^ a b Anderson, Heather (June 2014). "Amphibious Architecture: Living with a Rising Bay". California Polytechnic State University, San Luis Obispo. Retrieved 2021-08-09.
- ^ a b c d Baxter, R. Scott; Allen, Rebecca; Hylkema, Mark G. (August 2007). "Cooley Landing: Cultural Resource Inventory and Assessment" (PDF). Palo Alto Online. City of East Palo Alto. Archived (PDF) from the original on 2021-04-22. Retrieved 2021-07-06.
- ^ a b c Cargill. "Virtual Tour". Archived from the original on 2008-09-07. Retrieved 2021-07-17.
- ^ a b Philips, Wendy (2002-07-21). "Dredger sculpting Hayward wetlands". Oakland Tribune.
- ^ "'Spy in Sky' Check on Bay Fill". Oakland Tribune. Oakland, California. 1972-06-05. p. 19.
- ^ Krause, John (2005). "2005 Self-Monitoring Report: Baumberg Complex – Hayward, California, Eden Landing Ecological Reserve" (PDF). California Department of Fish and Game.
- ^ a b c d San Francisco Bay Conservation and Development Commission (2020-12-18). "BCDC PERMIT NO. 2003.007.03" (PDF). California Department of Fish and Wildlife.
- ^ Krist, John (2002-07-21). "Restoration of wetlands will take money, time". Ventura County Star.
- ^ Siegel, Stuart W.; Bachand, Philip A.M. (2002). "Feasibility Analysis: South Bay Salt Pond Restoration, San Francisco Estuary, California" (PDF). Wetlands and Water Resources. Archived (PDF) from the original on 2021-07-09. Retrieved 2021-07-06.
- ^ U.S. Fish & Wildlife Service (July 2019). "Don Edwards San Francisco Bay National Wildlife Refuge: 2019 -2020 Waterfowl Hunting Regulations" (PDF). Retrieved 2021-08-09.
- ^ Philip Williams & Associates, Ltd. (2005). "Flood Management and Infrastructure Existing Conditions Report" (PDF). South Bay Restoration.