U.S. Coast Guard Marine Safety Unit Pittsburgh patrols the Allegheny River in preparation for the Group of 20 Summit when Pittsburgh hosted President Barack Obama and leaders from countries that represented 85 percent of the world’s economy. Various agencies worked together to patrol the Allegheny, Ohio and Monongahela Rivers. US Coast Guard Art Program 2010 Collection, Ob ID # 201028, "Standing watch on Pittsburgh’s three rivers," Don Norris, watercolor, 13.5 x 13
