| Location: | LAT. 39-22-32, LONG. 90-54-32, IN UPPER END OF LOCK GUIDE WALL, AT MILE 273.5 ABOVE THE MOUTH OF THE OHIO RIVER. |
| Gage: | STAFF GAGE FLOAT WELL AND G.O.E.S. TELEMETERED DATA COLLECTION PLATFORM. OWNED, OPERATED AND MAINTAINED BY ST. LOUIS DISTRICT, CORPS OF ENGINEERS. |
| General Information: | DRAINAGE AREA, 140,900 SQUARE MILES. NOTE: MAXIMUM REGULATING POOL (449.00 FEET NGVD.) FIRST REACHED ON MAY 14, 1940. |
| Records Available: | ELEVATION, AUG. 1939 TO DATE, IN FILES OF CORPS OF ENGINEERS. |
| Mean Elev: | PERIOD OF RECORD, 448.28 FT . 01 JAN 1941 TO DATE, 448.39 FT . |
| Extreme Elev: | PERIOD OF RECORD, DAILY HIGH OF 460.02 FT ON 29 JUL 1993 & PERIOD OF RECORD, DAILY LOW OF 433.10 FT ON 25 JAN 1940 . 01 JAN 1941 TO DATE, DAILY LOW OF 435.94 FT ON 14 FEB 1941 . |
| Zero Gage Datum: | 421.81 ft NGVD 29 NOTE: SUBTRACT DATUM FROM ELEVATION TO OBTAIN STAGE. |
ALL VALUES RECORDED AT 8AM. ELEVATION IN FT: