Forks of the Sky State Park, Natural conservation park near Index, United States.

Forks of the Sky State Park is a natural conservation area covering roughly 1,300 acres near Index along Highway 2 and the Skykomish River. The park includes dense forest, multiple day-use areas such as Big Eddy and Raptor Point, and a natural rock wall with climbing routes.

Forks of the Sky State Park is a 1,300-acre unit of the Washington State Park System on the Skykomish River, adjacent to U.S. Highway 2 near Index, and administered by Wallace Falls State Park. The state acquired the Index Town Wall, a 1,200-foot climbing and BASE jumping wall with 500 documented routes by 2003, in 2010; it is now part of the park.

The Index Town Wall serves as a gathering spot for climbers who come to practice on natural rock formations throughout the year. People from nearby areas regularly visit to work on their skills and enjoy the outdoor climbing community.

Access is from U.S. Highway 2 near Index, and the park is administered from Wallace Falls State Park further west. The Index Town Wall is reached by a climbers' trail; the tunnel at its base is blocked, so it cannot be walked through. The Wild Sky Wilderness is entered on foot from within the park.

The tunnel boring machine tested at the Index Town Wall was the same machine later sent to dig under the English Channel. Its test bore left a blocked tunnel at the base of the 1,200-foot wall, which by 2003 carried 500 documented climbing routes.