Richard Dattner, of Dattner Architects, shares his vision for Riverbank State Park, the roof of the sewage treatment plant on the Hudson River was developed as an urban park. The roof of the sewage treatment plant on the Hudson River was developed as an urban park. Two bridges provide access to this year-round recreation facility containing an indoor and outdoor swimming pool complex, multi-purpose structures for athletic and cultural activities, playing fields, court games and a running track, picnic areas and a riverfront promenade, amphitheater, two playgrounds and a restaurant with views up the river.