Wildcat Marsh is the wetlands delta formed by the mouth of Wildcat Creek at its confluence with Castro Creek in Richmond, California. [1] The marsh is critical habitat for endangered species [1] and has been contaminated [2] [3] and damaged [1] by runoff from the Chevron Richmond Refinery [2] [3] and the city's landfill [1] and a salvage yard. [1] The marsh was isolated from tidal effects but restoration efforts are underway [1] as is the closure of the landfill [1] and cleanup of the mudflats contaminated by mercury [2] [3] and PAHs [2] [3] from the refinery. [2] [3]