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SUSTAINING OUR PARK FOR ALL GENERATIONS SUSTAINING OUR PARK FOR ALL GENERATIONS RIVERSIDE STATE PARK FOUNDATION Many people are looking for a great outdoor experience that is close to home. We help Riverside State Park provide this opportunity for everyone. We know that when people have a great experience outdoors they are happier and healthier. Riverside State Park Wilderness Near the City ABOUT RIVERSIDE STATE PARK EVENTS AND ACTIVITIES IN THE PARK EVENTS AND ACTIVITIES IN THE PARK Whether your interests are hiking biking boating or equestrian trail riding Riverside State Park offers outdoor adventures for everyone with over 9000 acres of forest land and natural areas along the Spokane and Little Spokane Rivers and is the second largest state park in Washington.