| Location: | LAT. 39-00-19, LONG. 90-41-29, LOWER END OF LOCK GUIDE WALL, AT MILE 241.2 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, 433 FEET NGVD. DRAINAGE AREA, 142,000 SQUARE MILES. NOTE: TAILWATER LEVELS EFFECTED BY LOCK & DAM 26 (REPLACED BY MELVIN PRICE LOCK & DAM) WHICH REACHED MAXIMUM REGULATED POOL (419.0 FEET NGVD) ON AUG 08, 1938. MELVIN PRICE LOCK AND DAM REACHED MAXIMUM REGULATED POOL (419.0 FEET NGVD) ON 01 FEB 1990. |
| Records Available: | ELEVATION, JAN. 1938 TO DATE, IN FILES OF CORPS OF ENGINEERS. |
| Mean Elev: | PERIOD OF RECORD, 424.68 FT . 01 JAN 1940 TO DATE, 424.71 FT . |
| Extreme Elev: | PERIOD OF RECORD, DAILY HIGH OF 446.57 FT ON 01 AUG 1993 & PERIOD OF RECORD, DAILY LOW OF 415.55 FT ON 19 JAN 1938 . 01 JAN 1940 TO DATE, DAILY LOW OF 416.10 FT ON 17 JAN 1940 . |
| Zero Gage Datum: | 407.00 ft NGVD 29 NOTE: SUBTRACT DATUM FROM ELEVATION TO OBTAIN STAGE. |
ALL VALUES RECORDED AT 8AM. ELEVATION IN FT: