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Map Satellite Heerdt Marsh is a remnant of the once extensive marshes that fringed portions of northern San Francisco Bay. Both salt marsh and mudflats occur here in about equal proportion. The marsh is dominated by pickleweed, Salicornia virginica, and cord grass, Spartina foliosa. Various algae are found on the mudflats.
Numerous animals are found in the area, particularly shorebirds which feed on the mudflats. Salt-marsh harvest mice, Reithrodontomys raviventris, and California clapper rails, Rallus longirostris obsoletus, both endangered species, have been reported from the marsh. Short-eared owls, Asio flammeus, are seen here.
Integrity: The northern portion of the marsh is impacted but in reasonably good shape. Much of the remainder has been leveed; however, it is to be restored. There are power lines in the area.
Use: Research, educational, observational.
February 1978
Inventory of California Natural Areas
Revision © 2008 Steven Louis Hartman
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