Migratory ducks, grebes, loons and shorebirds use our Richardson Bay Sanctuary for re-fueling on their journeys south, or while they over-winter in San Francisco Bay. Approximately 900 acres of bay waters are closed to the public from October 1 to March 31. This closure is the only one of its kind in the entire San Francisco Bay, making it incredibly important for migratory birds. Watch above as the Richardson Bay Sanctuary team marks the boundaries with buoys.