Cordelia Slough is a 10.8-mile-long (17.4 km)[1] tidal watercourse which discharges to the Suisun Slough, which in turn empties into Grizzly Bay in Solano County, California.[2] The Suisun Slough, fed by the Green Valley Creek and Red Top Creek, provides a productive habitat for a diversity of aquatic flora and fauna. In particular steelhead migrate up Cordelia Slough to spawn in its two tributaries.[3]