24/7 Trauma and Biohazard Cleanup in Mossyrock, WA

Mossyrock is a small city in Lewis County, Washington, set on Klickitat Prairie along U.S. Route 12, the White Pass Scenic Byway.

Mossyrock began in 1852 as a trading post named Mossy Rock, after a 200-foot-high moss-covered rock at the east end of Klickitat Prairie; the Indigenous name for the area was Coulph.

Many of Mossyrock's early settlers had emigrated from West Virginia, part of an Appalachian migration into the Washington Cascades documented by historians.

Mossyrock was not officially incorporated until January 2, 1948 — nearly a century after the trading post was founded.

The 2020 census counted 768 residents in 290 households in Mossyrock, up from 486 people in 2000 and 759 in 2010.

Mossyrock is an unusually young small town: its 2020 median age was just 35.0 years, 29.0% of residents were under 18, and 41.4% of households included children.

Hispanic or Latino residents made up 35.5% of Mossyrock's population at the 2020 census, reflecting the farm workforce of the surrounding valley.

Mossyrock hosts the annual three-day Blueberry Festival on the first weekend of August — begun in 2006 to honor the local blueberry farming economy, it fills Klickitat Prairie Park with pie-eating contests, farm tours, car shows, and music.

The city covers only 0.69 square miles at an elevation of about 659 feet.

Mossyrock was the home of Harry R. Truman, the Spirit Lake lodge keeper who famously refused to evacuate and died in the May 18, 1980 eruption of Mount St. Helens.