Rainbow Falls State Park

Rainbow Falls State Park is a public recreation area on the Chehalis River. It is situated off Washington State Route 6 and is approximately 1.0 mi east of the town of Dryad, Washington.

The state park's 129 acre feature 3900 ft of shoreline, the waterfall for which the park is named, and some of the last standing old-growth trees in the Chehalis Valley.

History
Rainbow Falls was used by the Upper Chehalis people as a fishing site for lampreys. The Civilian Conservation Corps (CCC) built the park, its log structures, and a popular footbridge over the falls, in 1935. 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.

Due to the park's location on the Chehalis River, the site has experienced several floods and subsequent damages. The footbridge was nearly destroyed during a buildup of a log jam during the 1972 Lewis County Flood; the height of the log jam exceeded the top of the bridge. In 2007, the park suffered severe flooding which destroyed the footbridge, other bridges along the Willapa Hills Trail, as well as the park's main entrance. Damages were listed at $6.5 million and visitors began using an alternate entrance to the park in 2008. The revised entrance was constructed at the location of the original CCC gateway and by 2011, the kitchen area and picnic areas, including playgrounds, were restored.

Geology
The area, 50 million years ago, was originally an inland sea and covered in sandstone. A lava flow that began in Oregon created the falls approxiamately 17 million years ago. The falls are located on the Chehalis River and the waters pour over basalt rock.

Ecology
Rainbow Falls State Park contains a variety of old growth trees, including Douglas fir, hemlock, and western red cedar. Big leaf maples and red alder also grow on the grounds but in smaller quantities. Edible plants, including types of Indian lettuce and mushrooms, are located in the park. Animals in the area include deer and elk.

Activities and amenities
The 129 acre park offers camping, fishing, and swimming, and contains 3.0 mi of hiking trails. The looping trails are flat and are not wheelchair accessible. Visitors to the park can access the 56-mile Willapa Hills Trail via a spur trail; the spur is under the oversight of Rainbow Falls State Park.

The annual Pe Ell River Run ends at the park. 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.