Mississippi River at Clarksville Lock and Dam 24

1. 153000.0 ftThis flow is approximately where CLKM7 goes to "open river" conditions.
2. 38.10 ftSny Island Cell #4 levee is overtopped.
3. 37.10 ftSny Island Cell #3 levee is overtopped.
4. 36.25 ftHighway 79 is closed from one mile south of Annada to two miles north of Annada. Route H is closed from Annada to about one mile west of Annada.
5. 36.00 ftNear this height, the top of the sewage treatment lagoon just south of town is overtopped.
6. 35.00 ftNear this height, the lock wall at Lock 24 is inundated.
7. 34.00 ftRoute W (Kentucky Street) is closed for one block between Third Street and Highway 79. Also, near this height, the living areas of homes in the Port Marmac area begin flooding.
8. 33.00 ftClarksville city businesses from 1st Street to 3rd Street begin to flood.
9. 32.79 ftIL route 96 from near Mozier to County Road 2 inundated and closed near this height.
10. 32.50 ftNear this level, the lock is closed to navigation.
11. 32.29 ftRoute N is closed between Route D and Highway 79.
12. 32.00 ftFront Street begins to flood.
13. 31.50 ftBurlington Northern SF railroad tracks begin to flood. Also, Highway 79 is closed about a mile south of Clarksville.
14. 31.00 ftThe Clarksville Boat Club, south of Lock & Dam 24, begins to flood. First Street begins flooding. A sand-filled barrier at the bottom of Howard Street is considered. In Hamburg, Illinois, Water Street floods.
15. 30.80 ftNear this height, Highway 79 is closed from Route N to about a mile northwest of that intersection.
16. 30.00 ftEast bank (Illinois side) begins to flood.
17. 29.00 ftWater enters the parking lot entrance at the Clarksville Riverfront Park.
18. 27.20 ftSilo Park just northwest of Clarksville off Highway 79 begins flooding.
19. 25.50 ftState Route P east of Elsberry begins flooding just east of the levee.
20. 25.30 ftThe road to Port Marmac, a riverside community of about 13 homes just south of Clarksville, begins flooding.
21. 23.50 ftFlooding begins in unprotected areas.
22. 23.00 ftAt this approximate stage, the Corps will take gates out of the river, creating "open river" conditions. This corresponds to an approximate stage of 155,000 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 29, 2026: 29.08 ft
• July 29, 2025: 26.45 ft
• July 16, 2025: 25.59 ft
• April 30, 2024: 27.05 ft
• May 6, 2023: 30.26 ft
• April 13, 2021: 27.78 ft
• March 19, 2021: 27.22 ft
• July 1, 2020: 27.29 ft
• June 12, 2020: 27.57 ft
• May 18, 2020: 25.43 ft

• UpstreamMississippi River at Louisiana
• DownstreamMississippi River at Mozier Landing
• Illinois River at Hardin
• Cuivre River at Troy
• Mississippi River at Saverton Lock and Dam 22
• Illinois River at Valley City
• Mississippi River at Winfield Lock and Dam 25
• Salt River (MO) at New London

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.