South Fork Chehalis River

The South Fork Chehalis River is a significant tributary of the Chehalis River in southwestern Washington, USA. Originating in the forested hills of Lewis and Cowlitz Counties, it flows through a rural landscape characterized by woodlands, small valleys, and agricultural areas before joining the main stem of the Chehalis River a few miles west of the city of Chehalis. As part of the larger Chehalis River Basin—the largest drainage system entirely within Washington state—this fork contributes to the watershed's rich ecological diversity. The river supports anadromous fish species, including salmon, and is valued for its natural beauty, recreational opportunities such as kayaking and fishing, as well as its role in local hydrology. Its clear waters wind through tranquil Pacific Northwest scenery, reflecting the region's temperate climate with lush vegetation and seasonal flows influenced by rainfall and upstream drainage from the Willapa Hills area.