Upper Twin Falls
Olallie State Park is a public recreation area featuring multiple waterfalls located five miles (8.0 km) southeast of North Bend, Washington.[2] The state park spans a 3.5-mile (5.6 km) stretch along the South Fork of the Snoqualmie River.[3] The most prominent feature of the park is 135-foot-high (41 m) Twin Falls.[4]
| Olallie State Park | |
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Snoqualmie River in Olallie State Park.
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  Location in the state of Washington  Olallie State Park (the United States) Show map of the United States | |
| Location | King, Washington, United States |
| Coordinates | 47°26′46″N 121°42′14″W / 47.44611°N 121.70389°W / 47.44611; -121.70389[1] |
| Area | 2,329 acres (9.43 km2) |
| Elevation | 623 ft (190 m)[1] |
| Established | 1950 |
| Operator | Washington State Parks and Recreation Commission |
| Website | Olallie State Park |
The park originated in 1950, when Washington State Parks purchased a 160-acre parcel from Puget Sound Power and Light. Originally named Twin Falls State Park, following the park's expansion in 1976 its name was changed to Olallie, after a Chinook word for the berries which are common in the park.[2]
The park features old-growth forests and five notable waterfalls: Twin Falls, Middle Twin Falls, Upper Twin Falls, Weeks Falls, and Upper Weeks Falls.
Twin Falls features a well-hidden underground run-of-the-river hydroelectric project that generates 24 MW of electricity.[5] The powerhouse is located 325 feet (99 m) below ground.
Park activities include fishing, hiking, mountain biking, bird watching, and rock climbing.[2] Completed in 2017, the Ollalie Trail added 9.2 miles (14.8 km) of backcountry mountain biking.[6]
