Percival Landing Park was named after the old commercial steamship wharf, a well-known maritime landmark in the Pacific Northwest. The Percival family operated the wharf. The first phase of Percival Landing was completed and opened in 1978, phase two in 1985, and phase three in 1988.Percival Landing is one of Olympia's three waterfront parks. The .9-mile boardwalk extends along the eastern shoreline of West Bay from the Fourth Avenue Bridge to Thurston Avenue. The City completed acquisition of the former Unocal Tank Farm site in 1996. This additional parkland is now a lawn area used for picnics and gatherings during special events.