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Allegheny Riverfront Park is a small municipal park along the south bank of the Allegheny River in Downtown Pittsburgh, Pennsylvania's Cultural District. It is a parcel of Three Rivers Park, the city's grand urban waterfront park along its rivers that provides a continuous green trail link between existing and future riverfront destinations. It is sited between Ninth Street Pier and Fort Duquesne Bridge and consists of two 4,000 foot promenades running alongside the river there, one upland and the other at river level. The lower tier opened in 1998, and the upper was completed in 2001. The Three Sisters bridges—Roberto Clemente Bridge, Andy Warhol Bridge, and Rachel Carson Bridge—each intersect with the park. The concept of riverfront parks in downtown Pittsburgh dates at least to 1911 and a plan of the Olmsted Brothers. The proposal was revived in the early 1990s when the Pittsburgh Cultural Trust's District Plan called for a riverfront park to frame the Cultural District's northern boundary. The Trust's Public Arts Advisory Committee commissioned a collaboration between artists Ann Hamilton, Michael Mercil, and landscape architect Michael Van Valkenburgh, who is a professor of landscape architecutre at the Harvard Graduate School of Design, to create the new park.