Ephemeral and intermittent drainages serve as critical habitat and travel corridors for resident and migratory species, and provide important ecosystem services, such as flood dissipation, sediment transport, and habitat connectivity. Ephemeral and intermittent drainages also provide insights into the processes and conditions of the watersheds they drain. Washes are dynamic landforms subject to rapid changes in flow pattern and channel shape. Geomorphic characteristics of wash channels interact with flora and fauna to determine the kind, extent, and configuration of riparian ecosystems. When investigated in combination, geomorphological and biological indicators can provide a powerful index of overall watershed condition and function.