| 27.9 |
This is the RECORD FLOOD LEVEL that was reached on July 9 1993. |
| 27.0 |
Water reaches the top of the lower gates. |
| 26.0 |
The Lock and Dam 20 Control Center begins flooding at this height. |
| 25.7 |
The Illinois levee protecting Meyer, IL is overtopped. The town of Meyer begins flooding. |
| 24.5 |
Lock and Dam 20 maintenance buildings begin flooding. |
| 20.0 |
Flood waters reach the top of the upper gates. |
| 19.5 |
In La Grange, parts of Highway 61/Highway B begin to flood. |
| 19.4 |
Water reaches the top of the lock wall, flooding the lock chamber. |
| 19.3 |
Drainage District begins to fill up. |
| 18.7 |
In La Grange, 2nd Street floods between Green St. and Lewis St. |
| 18.6 |
In La Grange, Green Street floods. |
| 18.2 |
In La Grange, MO, Bunge Car Park begins to flood. |
| 18.0 |
Near this level, the lock is closed to navigation. This level will vary with circumstance. Also, the road leading to the lock and dam and the railroad crossing flood at this height. |
| 17.6 |
In La Grange, MO, the entrance to Mark Twain Casino parking lot begins to flood. Alternate entrance is used. Also, water reaches the base of area levees. |
| 16.8 |
Burlington Northern/Sante Fe railroad tracks are overtopped. |
| 16.6 |
The lower road leading to the campground and RV park floods at this height. |
| 14.0 |
Both banks begin to overflow. Minor damages begin. |
| 8.5 |
The Corps will not allow the pool level to drop below 8.5 feet (higher flows below 100K). At low flows, they allow a 2-foot variation between 11.0 and 13.0 feet. At higher flows below 100K, the range is actually lower, between 8.5 and 10.5 feet. Above 100K cfs, the gates are raised above the water surface, allowing open river conditions. |
weather.gov 
