Salkum is a rural unincorporated community in Lewis County, Washington. The town is located on U.S. Route 12 and is 2.1 miles west of Silver Creek. The area was a village of the Cowlitz Indian Tribe. Salkum is a Cowlitz Indian word meaning "boiling water" or "boiling up", a reference to a nearby series of waterfalls on Mill Creek. The waterway was once k…Salkum is a rural unincorporated community in Lewis County, Washington. The town is located on U.S. Route 12 and is 2.1 miles west of Silver Creek. The area was a village of the Cowlitz Indian Tribe. Salkum is a Cowlitz Indian word meaning "boiling water" or "boiling up", a reference to a nearby series of waterfalls on Mill Creek. The waterway was once known as Salkum Creek and the community took its name from the prior moniker.