National Weather Service Advanced Hydrologic Prediction Service

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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office St. Louis, MO

North Central River Forecast Center

Hydrograph

River at a Glance

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Mississippi River at Clarksville Lock and Dam 24

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Tabular Data (UTC)

Tabular Data (CDT)

Datum: Not Available

Metadata

NOTE: 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.

NOTE: For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.

NOTE: Forecasts for the Mississippi River at Clarksville Lock and Dam 24 are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet)

Major Flood Stage:	33
Moderate Flood Stage:	31
Flood Stage:	25
Action Stage:	23
Low Stage (in feet):	-9999

Historic Crests
(1) 37.73 ft on 07/29/1993
(2) 37.11 ft on 06/02/2019
(3) 36.76 ft on 04/24/1973
(4) 36.70 ft on 06/24/2008
(5) 35.30 ft on 04/22/2013
(6) 34.78 ft on 07/09/2014
(7) 34.70 ft on 05/16/2001
(8) 33.70 ft on 10/05/1986
(9) 33.24 ft on 04/06/1983
(10) 33.13 ft on 10/13/2018
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 27.78 ft on 04/13/2021
(2) 27.22 ft on 03/19/2021
(3) 27.29 ft on 07/01/2020
(4) 27.57 ft on 06/12/2020
(5) 25.43 ft on 05/18/2020
(6) 29.12 ft on 04/03/2020
(7) 29.29 ft on 10/19/2019
(8) 37.11 ft on 06/02/2019
(9) 25.07 ft on 12/05/2018
(10) 25.01 ft on 11/16/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 9.50 ft on 02/26/1950
(2) 9.95 ft on 01/28/1944
(3) 10.34 ft on 02/25/1965
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:14

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
153000	This flow is approximately where CLKM7 goes to "open river" conditions.
38.1	Sny Island Cell #4 levee is overtopped.
37.1	Sny Island Cell #3 levee is overtopped.
36.25	Highway 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.
36	Near this height, the top of the sewage treatment lagoon just south of town is overtopped.
35	Near this height, the lock wall at Lock 24 is inundated.
34	Route 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.
33	Clarksville city businesses from 1st Street to 3rd Street begin to flood.
32.79	IL route 96 from near Mozier to County Road 2 inundated and closed near this height.
32.5	Near this level, the lock is closed to navigation.
32.29	Route N is closed between Route D and Highway 79.
32	Front Street begins to flood.
31.5	Burlington Northern SF railroad tracks begin to flood. Also, Highway 79 is closed about a mile south of Clarksville.
31	The 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.
30.8	Near this height, Highway 79 is closed from Route N to about a mile northwest of that intersection.
30	East bank (Illinois side) begins to flood.
29	Water enters the parking lot entrance at the Clarksville Riverfront Park.
27.2	Silo Park just northwest of Clarksville off Highway 79 begins flooding.
25.5	State Route P east of Elsberry begins flooding just east of the levee.
25.3	The road to Port Marmac, a riverside community of about 15 homes just south of Clarksville, begins flooding.
23.5	Flooding begins in unprotected areas.
23	At 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.
Photos (1) Lock and Dam tailwater instruments on June 22, 2010 at a stage of 36.5 feet. (2) Lock and Dam 24 control center on June 22, 2008 at a stage of 36.5 feet. (3) Clarksville riverfront on 22 June 2008 at 36.5 feet. (4) Tennessee Street near 3rd Street on 22 June 2008 with a stage of 36.5 feet. (5) Kentuckty Street near Highway 79 with a stage of 36.5 feet on 22 June 2008. (6) Tennessee and 3rd Streets on 22 June 2008 with a stage of 36.5 feet. (7) Clarksville along Highway 79 (2nd Street) on 22 June 2008 with a stage of 36.5 feet. (8) Along Wilber Street at 3rd Street with a stage of 36.5 feet on 22 June 2008. (9) Intersection of Highway 79 and W on May 17, 2001 at 34.5 feet. (10) Along Wilber Street on 22 June 2008 at a stage of 36.5 feet. (11) Main Street at 1st Street on May 17, 2001 at a stage of 34.4 ft. (12) Howard Street on May 17, 2001 at a stage of 34.5 feet. (13) Highway 79 about 1.6 miles south of Clarksville on June 25, 2010 at 31.34 ft. (14) Clarksville Boat House flooding on June 25, 2010 at a stage of 31.34 feet. (15) 1st Street in Clarksville on June 25, 2010 at a stage of 31.34 feet. (16) Parking area at the Clarksville Riverfront Park on June 25, 2010 at a stage of 31.34 feet. (17) Highway P near Elsberry on May 19, 2009 at 29.8 ft. (18) Aerial View

About This Location

Latitude: 39.373333° N, Longitude: 90.904722° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	25 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	421.59 ft	446.59 ft	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	421.81 ft	446.81 ft	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	Not Available	Not Available

Additional Information

How low could the river get?

Resources

Hydrologic Resources

Additional Resources

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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Page last modified: 2-Nov-2020 7:29 PM

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