Crime Scene & Biohazard Cleanup Near Downtown Deep River Deep River, WA

Deep River is a census-designated place in Wahkiakum County, northwest of the town of Cathlamet and east of Long Beach, spread along the Deep River valley near the Columbia River estuary.

According to early settlers, the river's Indigenous name, Alamicut, meant "deep river"; on the Wilkes Expedition chart of 1841 the river appeared as Ela-be-kail.

Deep River first appeared as a census-designated place in the 2010 U.S. census.

The 2020 decennial census counted 217 residents in Deep River, up from 204 in 2010, spread across 13.54 square miles — a density of only about 15 people per square mile.

At the 2010 census there were 92 households in the CDP, the average household size was 2.22 people, and the median age was a notably old 55.4 years.

In the 1940s Deep River was a working logging-camp community of Scandinavian immigrant families, including Swedish blacksmith Eric Johnson, whose family life in the camp has been documented by the Key Peninsula–area press and local historians.

The CDP includes the smaller riverside community of Svensens Landing.

Deep River students attend the Naselle-Grays River Valley School District, a K-12 district of about 670 students, and Nirvana bassist Krist Novoselic has been recorded as a resident of Deep River.