The river, formed by the confluence of its north and south
forks, begins at
Myrtle Point. The
North Fork Coquille River, about long), rises in northern
Coos County and flows southwest. The
East Fork Coquille River, about long, rises in eastern Coos County, and flows generally west to join the North Fork. The
South Fork, about long, rises in southern Coos County, north of the
Wild Rogue Wilderness Area, and flows generally north. It receives the
Middle Fork Coquille River, about long, then joins the North Fork from the south at Myrtle Point. The combined river meanders generally west, past
Coquille. It enters the Pacific at
Bandon, about north of
Cape Blanco.
Tributaries Named tributaries of the Coquille River from source to mouth are the
North Fork and
South Fork followed by Grady, Hall, Gray, Fishtrap, Glen Aiken, Pulaski, Rink, Fat Elk, Calloway, and China creeks. Next come Beaver, Iowa, and Hatchet sloughs followed by Alder, Lampa, Lowe, and Bear creeks. Further downstream Offield Creek enters via Randolph Slough. Then come Sevenmile and Fahys creeks followed by Peterson Gulch. Below that are Spring, Simpson, and Ferry creeks. ==Tidal effect==