The Chehalis River is a major river located in western Washington, USA. It flows approximately 145 miles from the Olympic Mountains to the Pacific Ocean, passing through several towns, including Chehalis and Centralia. The river is known for its scenic beauty and diverse ecosystems, supporting various wildlife species. The Chehalis River basin is an important area for agriculture and forestry, contributing to the local economy. It also provides recreational opportunities such as fishing, kayaking, and hiking along its banks. The river is part of the larger Chehalis Basin, which is crucial for water management and flood control in the region.