Although the provenance before 1950 is a little vague, records show that Washington State Parks purchased a small parcel of land from Puget Sound Power and Light; this parcel of land included a few waterfalls, one of which was Twin Falls. The park was named Twin Falls State Park. Washington State Parks continued to purchase acreage and added it to Twin Falls State Park. In 1977, Washington State Park officially changed the name to Olallie in a nod to Chinook Native American’s word for salmonberry, which grows abundantly in the park. Salmonberries are similar to raspberries, but its flavor is more subtle.
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