[4] The Civilian Conservation Corps (CCC), Company 1633,[5] built the park, its log structures, and a popular footbridge over the falls, completing the grounds in 1935.

The Black men lived in segregated barracks, but unlike stricter separation requirements noted at Millersylvania State Park at the same time, the camp's workers often labored side-by-side.

The enrollees were reassigned after their first six-month term of service following a CCC directive that no Black employees were allowed to work outside the borders of their own states.

[7] The wooden bridge was restored in 2006 and additional improvements, including the construction of a kitchen and new bathroom facilities, were also undertaken that year.

[2] Rainbow Falls State Park contains a variety of old growth trees, including Douglas fir, hemlock, and western red cedar.

Held since 1978, the event consists of entrants buying or building water crafts and floating down the Chehalis River from Pe Ell.

Riders can float over the waterfall that still remains in the park despite severe flooding damage due to the Great Coastal Gale of 2007.