The 123-foot long, riveted Pratt through-truss is the only bridge of this type still carrying highway traffic in Delaware. It rests on abutments from a predecessor of 1883. Climbing down the steep bank, one sees that the roadway is still supported by an early stone arch (c. 1830) that once crossed a millrace. At that time, Rising Sun Bridge was a graceful covered span. Just east is the original entrance to the DuPont Experimental Station (BR25), formerly Lower Powder Yard. Along the west bank runs a sewer line, blasted into solid rock by the WPA in one of its most difficult Delaware projects (1935–1936).