The relatively warm water temperatures in the canal are a result of limited tidal exchange, which keeps the surface layer trapped and allows it to heat up during the summer.
The park's infrastructure, including the historic kitchen shelter, was constructed by the Civilian Conservation Corps in 1937.
The shoreline is part of the Hood Canal, a glacial fjord that is technically an inlet of the Puget Sound.
The park provides habitat for black bears, deer, and various species of eagles that frequent the forested slopes.
Twanoh State Park is distinct for featuring some of the warmest saltwater swimming beaches in the Puget Sound region, a phenomenon caused by the shallow, restricted water circulation of the Hood Canal. Located on the southern shore of the canal, the 182-acre park includes a mix of saltwater shoreline and forested upland hiking trails. The park was originally developed by the Civilian Conservation Corps (CCC) during the 1930s. Its landscape transitions from a sandy beach at sea level to a steep, second-growth forest inland. The beach is a popular destination for shellfish harvesting, specifically for oysters and clams, subject to seasonal health regulations. Visitors can access a variety of amenities, including boat launches and designated picnic areas nestled within the trees. The site serves as a primary access point for recreational activities on the Great Bend of the Hood Canal.
The CCC-built picnic shelter overlooking the beach with the Olympic Mountains in the distance.
Verify current shellfish safety levels on the Washington Department of Health website before harvesting.
Bring water shoes, as the beach terrain transitions quickly from sand to smooth, rocky gravel.
Arrive early during summer weekends, as the parking lot capacity is limited and often reaches maximum occupancy.
Do not attempt to harvest shellfish without first checking for paralytic shellfish poisoning (PSP) closures.
Year-round operation, but some water-based facilities and campsites may have seasonal limitations.
Pack out all trash; keep pets on a leash at all times; observe harvest limits for shellfish.
