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]
Cordelia Bay is known for its species biodiversity and also for prevalence of endangered species such as Sacramento splittail, Pogonichthys macrolepidotus and the Salt Marsh Harvest Mouse. [4]
Some areas which drain into Cordelia Slough from the north are subject to development pressure from the expanding population of the San Francisco Bay Area; correspondingly, there are increasing risks of adverse water quality due to urban surface runoff from such new development. [5] Cordelia Slough is considered a subarea of the Grizzly Island Wildlife Area, which is a State of California designated Wildlife Area. [6] [7]