Photo 1218Photograph detailA boardwalk bridge spans stagnant green water in a salt marsh.LocationAlviso Salt Marshes, Don Edward San Francisco Bay National Wildlife RefugeTaken2010-08-16 10:32:04CategoriesLandscapesWaterscapesStructuresDimensions3072 × 2048 pixelsHigh-resolution downloadLicenseCreative Commons Attribution 3.0 United States License