The East Fork Satsop River originates at the confluence of Phillips Creek and Stillwater Creek. It flows generally southwest through a broad and flat valley. Bingham Creek is its main tributary, joining from the north. Below Bingham Creek the East Fork flows through Carstairs Prairie before being joined by Decker Creek and the Middle Fork Satsop River, both from the north. The East Fork is approximately long. Its headwater tributary, Stillwater Creek, is long.
