Olallie State Park is a 2,500- acre day use park on the western slopes of the Cascade Mountains featuring dramatic waterfalls, cliff formations and old-growth trees over 10 feet in diameter. The park is a popular location for hiking, picnicking, fishing and rock climbing. The park’s popular hiking destinations include Twin Falls, Weeks Falls, Cedar Butte and Mount Washington. “Olallie” is the Chinook Jargon word for “berry.” The park is rich in huckleberries.