Olallie State Park is known for the scenic beauty of its two waterfalls. Located on the western slopes of the Cascade Mountains, this 2,500-acre day-use park features 6 miles of hiking trails, cliff formations, and old-growth forest teeming with huckleberries. An 80-foot bridge connects the park’s two main attractions: Weeks Falls (77 feet) and the spectacular Twin Falls (135 feet).
Olallie has multiple trailheads and access points for a variety of recreational activities. Old-growth trees spanning up to 10 feet in diameter add color to the park, and dramatic cliff formations along the western slopes are popular for rock climbing. The park connects with the Iron Horse Trail and John Wayne Pioneer Trail, providing visitors with access to miles of hiking and biking trails.
An interpretive trail at the South Fork Picnic Area passes through a small grove of old-growth trees. Interpretive signage provides visitors with information about the Snoqualmie Wagon Road, the first road to run from Ellensburg to Seattle in the 1800s.
History: In 1950, Puget Sound Power and Light Company sold 160 acres along the South Fork of the Snoqualmie River, including Twin Falls, to Washington State Parks and Recreation Commission. At that time, an informal trail led from a roadside rest area on the Snoqualmie Pass Highway to Twin Falls. The area was officially named “Twin Falls State Park” in 1974. In 1976 another 210 acres was added on the east side of the park. The park was renamed “Olallie State Park” in 1977 for the Chinook jargon word for berry, which was chosen due to the abundance of huckleberries in the area.
In the early 1980s, a private company expressed interest in building two hydroelectric plants in the park: one at Weeks Falls and the other at Twin Falls. After a public planning process, the hydroelectric plant plans were modified to reduce the impact on local fish and retain the scenic aspects of the falls. Construction of the two power plants was completed in 1990. To mitigate the impact, a new trail was constructed from the west end of the park to Twin Falls.
The park grew to include the northern slopes of Mount Washington in the 1990s, and is now more than 2,500 acres in size.
This cache is located along the Weeks Falls Interpretive Trail. Please remember to return everything as you found it. This part of the park is classified as a “Natural Area” and off trail activities are prohibited. Parking can be found at the Olallie State Park South Fork Picnic Area. A Discover Pass is needed to park.
Park hours:
The park is open year-round for day use only.
Summer: 6:30 a.m. to dusk. Winter: 8 a.m. to dusk.
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- This geocache has an approved Permit to be placed at this location on property managed by the Washington State Parks and Recreation Commission. Visitors are responsible for acquainting themselves with policies and rules pertaining to State Parks areas.
- The following items may not be placed in the geocache: food, illegal substances, medications, personal hygiene products, pornographic materials, hazardous materials, or weapons of any type.
- By searching for the cache, visitors agree that they are responsible for their own actions, and acknowledge that neither the State of Washington nor the cache owner is responsible for any loss or injury that may occur in relation to such search.
- Report any incident, problem, or violation to State Parks staff.
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