The Damon Marsh is a tidal wetland at the northern edge of San Leandro Bay in Oakland, California, US.[1] There is a paved 0.84-mile (1.35 km) long shoreline trail along the waterfront to allow visual access to the San Leandro Bay and through the marsh itself.[2] One end of this trailhead lies at Damon Slough. Access to the marsh is via the Hegenberger Road exit of Interstate 880. A 1989 biological study of the Damon Marsh found that this habitat supports the California clapper rail (Rallus longirostros obsoletus), a federally and state-listed endangered avian species.[3]