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The Kimball Island Mitigation Bank - A Wildlands Legacy Bank
(for information on current Wildlands banks, see the Bank Catalog)

The Kimball Island Mitigation Bank, established in December 1997, provides diverse aquatic, wetland, and riparian habitats that were once prevalent in the Sacramento-San Joaquin Delta.

The island lies in the California Delta at the confluence of the state’s largest rivers, the Sacramento and the San Joaquin, and is strategically located with respect to important Delta environments, including the Sherman Island Waterfowl Management Area to the immediate north and the Suisun Marsh to the west.

Creating the Bank - Steps and Innovations
Natural historic conditions in the Delta included winding sloughs with tidal action. Re-establishing slough hydrology to Kimball Island was the major design concept for restoring natural shaded riverine habitat.

Shaded riverine aquatic habitat is found along rivers with overhanging vegetation that shades the water below. Many types of fish require shallow water with shelter from the sun for eggs and fingerlings to thrive. Vegetated banks and shallows also provide refuge from predators.

To develop this concept into a technically complete restoration plan, Wildlands analyzed nearby natural sites and created detailed construction criteria. The restoration plan addresses the issues of bank and channel stability, channel design appropriate to local watershed conditions, tidal prism and channel hydraulics, structural habitat requirements, re-vegetation, and control of invasive plants.

Description

Kimball Island Mitigation Bank, which encompasses 109 acres located in southwest Sacramento County, includes the following types of habitats:

• Riverine Aquatic Bed
• Riparian Forest
• Tidal Perennial Marsh
• Shaded Riverine Aquatic.

The project complements local, state, and federal efforts to restore ecological integrity to the Delta and enhance the sustainable production and survival of native and other desirable fish and wildlife species, including:

• Delta smelt
• Steelhead
• Sacramento splittail
• Chinook salmon
• California black rail
• Delta tule pea
• Mason’s lilaeopsis


Click to view Kimball Island video