| Location: | LAT. 39-22-20, LONG. 90-54-13, IN LOWER END OF LOCK GUIDE WALL, AT MILE 273.2 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: | FLOOD ELEVATION, 446.81 FEET NGVD. DRAINAGE AREA, 140,900 SQUARE MILES. NOTE: TAILWATER LEVELS EFFECTED BY LOCK & DAM 25 WHICH REACHED MAXIMUM REGULATED POOL (434.0 FEET N.G.V.D.) ON JULY 11, 1939. |
| Records Available: | ELEVATION, AUG. 1939 TO DATE, IN FILES OF CORPS OF ENGINEERS. FROM 1930 TO AUG. 1939, A CONSTRUCTION GAGE WAS MAINTAINED AT MILE 272.8. |
| Mean Elev: | PERIOD OF RECORD, 439.66 FT . 01 JAN 1940 TO DATE, 439.68 FT . |
| Extreme Elev: | PERIOD OF RECORD, DAILY HIGH OF 459.50 FT ON 29 JUL 1993 & PERIOD OF RECORD, DAILY LOW OF 431.80 FT ON 26 FEB 1950 . |
| Zero Gage Datum: | 421.81 ft NGVD 29 NOTE: SUBTRACT DATUM FROM ELEVATION TO OBTAIN STAGE. |
ALL VALUES RECORDED AT 8AM. ELEVATION IN FT: