The Humptulips River is a river in Grays Harbor County, Washington, in the United States. Its main tributaries are the East Fork Humptulips River, about 20 miles (32 km) long (32 km), and West Fork Humptulips River, about 30 miles (48 km) long (48 km). After the forks join, the main river is approximately 20 miles (32 km) long. The Humptulips has a drainage basin of 276 square miles (710 km2). The river's average discharge is 1,344 cu ft/s (38.1 m3/s), with a maximum recorded discharge of 37,500 cu ft/s (1,060 m3/s), in November, 2006, and a minimum of 82 ... Source: Wikipedia