High Quality Content by WIKIPEDIA articles! The Skokomish River is a river in Mason County, Washington, United States. It is the largest river flowing into Hood Canal, an arm of Puget Sound. From its source at the confluence of the North and South Forks the main stem Skokomish River is approximately 9 miles (14 km) long. The longer South Fork Skokomish River is 40 miles (64 km), making the length of the whole river via its longest tributary about 49 miles (79 km). The North Fork Skokomish River is approximately 34 miles (55 km) long. A significant part of the Skokomish River`s watershed is within Olympic National Forest and Olympic National Park.