Willow Creek is a 57-mile (92 km) tributary of the Malheur River in Malheur County in the U.S. state of Oregon. The creek, which forms at 3,724 feet (1,135 m) above sea level and ends at 2,234 feet (681 m), flows generally southeast between Ironside and Vale. Willow Creek's watershed covers 787 square miles (2,040 km2) of relatively arid land.