| Location: | LAT. 39-00-03, LONG. 90-41-16, AT UPPER END OF LOCK GUIDE WALL, AT MILE 241.5 ABOVE THE MOUTH OF THE OHIO RIVER. |
| Gage: | STAFF GAGE FLOAT WELL AND G.O.E.S. TELEMETERED DATA COLLECTION PLATFORM. BY ST. LOUIS DISTRICT, CORPS OF ENGINEERS. |
| General Information: | DRAINAGE AREA, 142,000 SQUARE MILES. |
| Records Available: | ELEVATION, MAY 1939 TO DATE, IN FILES OF CORPS OF ENGINEERS NOTE: MAXIMUM REGULATING POOL (434.00 FEET NGVD) REACHED ON JULY 11, 1939. |
| Mean Elev: | PERIOD OF RECORD, 432.95 FT . 01 JAN 1940 TO DATE, 432.96 FT . |
| Extreme Elev: | PERIOD OF RECORD, DAILY HIGH OF 447.44 FT ON 31 JUL 1993 & PERIOD OF RECORD, DAILY LOW OF 420.11 FT ON 21 FEB 1950 . |
| Zero Gage Datum: | 407.00 ft NGVD. NOTE: SUBTRACT DATUM FROM ELEVATION TO OBTAIN STAGE. |
ALL VALUES RECORDED AT 8AM. ELEVATION IN FT: