U. S. ENGINEER OFFICE, CHICAGO, ILLINOIS ILLINOIS WATERWAY ALTON R.R. BRIDGE, MILE 303.9, VERTICAL CLEARANCE ABOVE COMPUTED EXTREME H.W. 10.5 FT.s HORIZONTAL CLEARANCE NAVIGABLE SPAN 60,0 FY. LOW STEEL ELEVATION, 593.4% FT. MATING. (CALUMET--SAG CHANNEL) OWNER, NORMAL TO. CHa PHOTO TAKEN ff [22 NOTE: C&U.E.RY. BRIDGE IMMEDIATELY UPSTREAM. CREMOVE ALTON R.R_CO. eerie LOW WATER DATUM FOR Laxe MICHIGAN t%.9 FT. /22]se." Vitw UPSTREAM . 60 by WATER SURFACE ELEVATION 578,3 FY. M.T.NsY. (--O02 LWO). FILE No Remncnncnas 3