Blueprints 4 Grace Memorial Bridge - Old Cooper River Bridge, Charleston South Carolina Tweet TRESTLE DETAILS, SHEET NO. 25 BENTS, ANCHORAGES, GIRDER DETAILS (PIERS 1 & 4), SHEET NO. 26 TRUSS DETAILS ANCHOR ARM 640 FOOT SPAN. SHEET NO. 27 TRUSS DETAILS OVER MAIN PIER 640 FOOT SPAN, SHEET NO. 28 TRUSS DETAILS CANTILEVER ARM 640 FOOT SPAN, SHEET NO. 29 TRUSS DETAILS SUSPENDED SPAN 640 FOOT SPAN, SHEET NO. 30