Mississippi River at Saverton Lock and Dam 22

1. 160000.0 ftAt this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
2. 28.60 ftWater enters the elevated flood building north of the lock house.
3. 28.00 ftIn Monkey Run, at least a dozen homes are flooded at this level.
4. 27.80 ftSaverton homes begin flooding near this level.
5. 27.30 ftThe work shop building at Lock and Dam #22 begins flooding at this height.
6. 27.00 ftSny Island Cell #1 levee is overtopped
7. 26.00 ftIn Monkey Run (north of Saverton), houses begin flooding near this level.
8. 25.70 ftWater enters Lock house north door and the railroad tracks crossing.
9. 25.50 ftHomes in Riverview Acres (just south of the lock and dam) begin to flood. Also, North Saverton Road floods near this height.
10. 25.20 ftMissouri Route E becomes impassable and is closed from Saverton Road near the Hascall Creek bridge to Lock and Dam 22.
11. 24.50 ftHighway 79 is closed at the Continental Cement Plant.
12. 24.20 ftMissouri Route E begins flooding at the lowest points.
13. 21.80 ftAt this height, the ties of the BNSF railroad tracks begin flooding.
14. 21.40 ftNear this level, the lock is closed to navigation. This level will vary with circumstance. Also, BNSF railroad tracks just south of Hannibal are flooded.
15. 15.50 ftAn access road to riverside raised homes on the riverward side of the Sny levee begins to flood near this level.
16. 13.50 ftThis is the upper navigational limit for the pool at Lock & Dam 22.
17. 13.40 ftThis is the target pool for navigation at Lock & Dam 22.
18. 13.00 ftThis is the lower navigational limit for the pool at Lock & Dam 22.
19. 12.00 ftBuildings in unprotected areas are damaged. At this approximate stage, the Corps will lift all gates out of the river, creating "open river" conditions. This takes place at a discharge of around 160,000 cfs.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• April 28, 2026: 18.71 ft
• July 28, 2025: 16.13 ft
• April 30, 2024: 16.78 ft
• May 6, 2023: 20.38 ft
• April 12, 2021: 17.25 ft
• March 19, 2021: 16.36 ft
• July 2, 2020: 16.65 ft
• June 12, 2020: 17.30 ft
• April 2, 2020: 18.98 ft
• October 17, 2019: 19.32 ft

• UpstreamMississippi River at Hannibal
• DownstreamMississippi River at Louisiana
• Salt River (MO) at New London
• North River (MO) at Palmyra
• Mississippi River at Quincy Lock and Dam 21
• Salt River (MO) at Cannon Dam tailwater
• Salt River at Clarence Cannon Dam (pool)
• Mississippi River at Quincy

Forecasts by the North Central River Forecast Center. Forecasts are issued routinely year-round. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time. For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, <a href="http://www.mvs.usace.army.mil/Missions/Navigation/Status-Reports/">click here.</a>

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.