|Mouth||Strait of Juan de Fuca|
|- location||Clallam Bay|
|- coordinates||Coordinates: |
|Length||15.7 mi (25.3 km) |
|Basin||31.1 sq mi (80.5 km2) |
The Clallam River originates in the Olympic Mountains near Ellis Mountain. It flows generally north collecting tributaries such as Blowder Creek, Charley Creek, Last Creek, and Pearson Creek before emptying into Clallam Bay, part of the Strait of Juan de Fuca. The community of Clallam Bay is located at the river's mouth.
The Clallam River is unusual in that sands and gravels frequently block the river's mouth. The river's lower course runs parallel to the sea, behind the gravel bars. Over the years the river repeatedly breaks through the barrier in different places, usually during periods of high stream flow. Sometimes migrating fish are trapped behind gravel barriers at the river's mouth. In July 1998 significant numbers of Steelhead trout were trapped in this way. The Pacific Coast Salmon Coalition had a channel cleared through the gravel bar, allowing the fish to escape.
- U.S. Geological Survey Geographic Names Information System: Clallam River
- "Clallam River Watershed Habitat Inventory and Assessment" (PDF). Mike Haggerty Consulting. Retrieved 2009-06-04.
- "Clallam River". Pacific Coast Salmon Coalition. Retrieved 2009-06-04.