Deep River

Deep River is a river located in the Great Southern region of Western Australia. The river is under tidal influence for the last of its length. Although generally shallow the Deep River has depths of up to in places. The Deep River is one of the few perennial rivers in Western Australia although 80% of its discharge occurs in winter and spring. The rivers water quality is very good, fresh and low in nutrients. The majority of the catchment of the Deep River is not cleared. The silt and clay content can be high during the winter period. The Deep River begins just west of Lake Muir about 50 km from the coast on the edge of the Yilgarn Plateau. Lake Muir may, in flood, overflow into the Deep River catchment. It flows through a valley between granite hills then wanders across the coastal plain finally entering the Nornalup Inlet on the western side.