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Weather Forecast Office St. Louis, MO North Central River Forecast Center
Flood Warning
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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Mississippi River at Clarksville Lock and Dam 24 Tailwater (ft)Flow (kcfs)Observed: 28.72 ft at 6:00PM May 20, 2013Observed: 28.71 ft at 6:30PM May 20, 2013Observed: 28.7 ft at 7:00PM May 20, 2013Highest Observation: 28.74 ft at 7:30PM May 20, 2013Observed: 28.73 ft at 8:00PM May 20, 2013Observed: 28.73 ft at 8:30PM May 20, 2013Observed: 28.72 ft at 9:00PM May 20, 2013Observed: 28.72 ft at 9:30PM May 20, 2013Observed: 28.72 ft at 10:00PM May 20, 2013Observed: 28.72 ft at 10:30PM May 20, 2013Observed: 28.71 ft at 11:00PM May 20, 2013Observed: 28.71 ft at 12:30AM May 21, 2013Observed: 28.71 ft at 1:00AM May 21, 2013Observed: 28.71 ft at 1:30AM May 21, 2013Observed: 28.71 ft at 2:00AM May 21, 2013Observed: 28.71 ft at 2:30AM May 21, 2013Observed: 28.71 ft at 3:00AM May 21, 2013Observed: 28.71 ft at 3:30AM May 21, 2013Observed: 28.71 ft at 4:00AM May 21, 2013Observed: 28.71 ft at 4:30AM May 21, 2013Observed: 28.71 ft at 5:00AM May 21, 2013Observed: 28.71 ft at 5:30AM May 21, 2013Observed: 28.71 ft at 6:00AM May 21, 2013Observed: 28.71 ft at 6:30AM May 21, 2013Observed: 28.7 ft at 7:00AM May 21, 2013Observed: 28.7 ft at 7:30AM May 21, 2013Observed: 28.7 ft at 8:00AM May 21, 2013Observed: 28.7 ft at 8:30AM May 21, 2013Observed: 28.7 ft at 9:00AM May 21, 2013Observed: 28.7 ft at 9:30AM May 21, 2013Observed: 28.7 ft at 10:00AM May 21, 2013Observed: 28.7 ft at 10:30AM May 21, 2013Observed: 28.69 ft at 11:00AM May 21, 2013Observed: 28.68 ft at 11:30AM May 21, 2013Observed: 28.68 ft at 12:00PM May 21, 2013Observed: 28.67 ft at 12:30PM May 21, 2013Observed: 28.66 ft at 1:00PM May 21, 2013Observed: 28.66 ft at 1:30PM May 21, 2013Observed: 28.65 ft at 2:00PM May 21, 2013Observed: 28.64 ft at 2:30PM May 21, 2013Observed: 28.63 ft at 3:00PM May 21, 2013Observed: 28.62 ft at 3:30PM May 21, 2013Observed: 28.6 ft at 4:00PM May 21, 2013Observed: 28.59 ft at 4:30PM May 21, 2013Observed: 28.58 ft at 5:00PM May 21, 2013Observed: 28.57 ft at 5:30PM May 21, 2013Observed: 28.56 ft at 6:00PM May 21, 2013Observed: 28.55 ft at 6:30PM May 21, 2013Observed: 28.54 ft at 7:00PM May 21, 2013Observed: 28.52 ft at 7:30PM May 21, 2013Observed: 28.51 ft at 8:00PM May 21, 2013Observed: 28.5 ft at 8:30PM May 21, 2013Observed: 28.49 ft at 9:00PM May 21, 2013Observed: 28.48 ft at 9:30PM May 21, 2013Observed: 28.47 ft at 10:00PM May 21, 2013Observed: 28.46 ft at 10:30PM May 21, 2013Observed: 28.45 ft at 11:00PM May 21, 2013Observed: 28.44 ft at 11:30PM May 21, 2013Observed: 28.43 ft at 12:00AM May 22, 2013Observed: 28.42 ft at 12:30AM May 22, 2013Observed: 28.41 ft at 1:00AM May 22, 2013Observed: 28.4 ft at 1:30AM May 22, 2013Observed: 28.39 ft at 2:00AM May 22, 2013Observed: 28.38 ft at 2:30AM May 22, 2013Observed: 28.38 ft at 3:00AM May 22, 2013Observed: 28.37 ft at 3:30AM May 22, 2013Observed: 28.36 ft at 4:00AM May 22, 2013Observed: 28.35 ft at 4:30AM May 22, 2013Observed: 28.35 ft at 5:00AM May 22, 2013Observed: 28.33 ft at 6:00AM May 22, 2013Observed: 28.32 ft at 6:30AM May 22, 2013Observed: 28.32 ft at 7:00AM May 22, 2013Observed: 28.31 ft at 7:30AM May 22, 2013Observed: 28.3 ft at 8:00AM May 22, 2013Observed: 28.3 ft at 8:30AM May 22, 2013Observed: 28.29 ft at 9:00AM May 22, 2013Observed: 28.28 ft at 9:30AM May 22, 2013Observed: 28.28 ft at 10:00AM May 22, 2013Observed: 28.27 ft at 10:30AM May 22, 2013Observed: 28.26 ft at 11:00AM May 22, 2013Observed: 28.26 ft at 11:30AM May 22, 2013Observed: 28.25 ft at 12:00PM May 22, 2013Observed: 28.24 ft at 12:30PM May 22, 2013Observed: 28.24 ft at 1:00PM May 22, 2013Observed: 28.23 ft at 1:30PM May 22, 2013Observed: 28.22 ft at 2:00PM May 22, 2013Observed: 28.21 ft at 2:30PM May 22, 2013Observed: 28.2 ft at 3:00PM May 22, 2013Observed: 28.19 ft at 3:30PM May 22, 2013Observed: 28.18 ft at 4:00PM May 22, 2013Observed: 28.18 ft at 4:30PM May 22, 2013Observed: 28.17 ft at 5:00PM May 22, 2013Observed: 28.16 ft at 5:30PM May 22, 2013Observed: 28.15 ft at 6:00PM May 22, 2013Observed: 28.14 ft at 6:30PM May 22, 2013Observed: 28.13 ft at 7:00PM May 22, 2013Observed: 28.12 ft at 7:30PM May 22, 2013Observed: 28.11 ft at 8:00PM May 22, 2013Observed: 28.1 ft at 8:30PM May 22, 2013Observed: 28.09 ft at 9:00PM May 22, 2013Observed: 28.08 ft at 9:30PM May 22, 2013Observed: 28.07 ft at 10:00PM May 22, 2013Observed: 28.06 ft at 10:30PM May 22, 2013Observed: 28.05 ft at 11:00PM May 22, 2013Observed: 28.04 ft at 11:30PM May 22, 2013Observed: 28.02 ft at 12:00AM May 23, 2013Observed: 28.01 ft at 12:30AM May 23, 2013Observed: 28 ft at 1:00AM May 23, 2013Observed: 27.99 ft at 1:30AM May 23, 2013Observed: 27.98 ft at 2:00AM May 23, 2013Observed: 27.97 ft at 2:30AM May 23, 2013Observed: 27.96 ft at 3:00AM May 23, 2013Observed: 27.94 ft at 3:30AM May 23, 2013Observed: 27.93 ft at 4:00AM May 23, 2013Observed: 27.92 ft at 4:30AM May 23, 2013Observed: 27.91 ft at 5:00AM May 23, 2013Observed: 27.9 ft at 5:30AM May 23, 2013Observed: 27.89 ft at 6:00AM May 23, 2013Observed: 27.87 ft at 6:30AM May 23, 2013Observed: 27.86 ft at 7:00AM May 23, 2013Observed: 27.85 ft at 7:30AM May 23, 2013Observed: 27.84 ft at 8:00AM May 23, 2013Observed: 27.82 ft at 8:30AM May 23, 2013Observed: 27.81 ft at 9:00AM May 23, 2013Observed: 27.8 ft at 9:30AM May 23, 2013Observed: 27.78 ft at 10:00AM May 23, 2013Observed: 27.77 ft at 10:30AM May 23, 2013Observed: 27.76 ft at 11:00AM May 23, 2013Observed: 27.74 ft at 11:30AM May 23, 2013Observed: 27.73 ft at 12:00PM May 23, 2013Observed: 27.72 ft at 12:30PM May 23, 2013Observed: 27.7 ft at 1:00PM May 23, 2013Observed: 27.69 ft at 1:30PM May 23, 2013Observed: 27.68 ft at 2:00PM May 23, 2013Observed: 27.66 ft at 2:30PM May 23, 2013Observed: 27.65 ft at 3:00PM May 23, 2013Observed: 27.63 ft at 3:30PM May 23, 2013Observed: 27.62 ft at 4:00PM May 23, 2013Observed: 27.6 ft at 4:30PM May 23, 2013Observed: 27.59 ft at 5:00PM May 23, 2013Observed: 27.57 ft at 5:30PM May 23, 2013Observed: 27.56 ft at 6:00PM May 23, 2013Observed: 27.54 ft at 6:30PM May 23, 2013Observed: 27.53 ft at 7:00PM May 23, 2013Observed: 27.52 ft at 7:30PM May 23, 2013Observed: 27.5 ft at 8:00PM May 23, 2013Observed: 27.49 ft at 8:30PM May 23, 2013Observed: 27.48 ft at 9:00PM May 23, 2013Observed: 27.46 ft at 9:30PM May 23, 2013Observed: 27.45 ft at 10:00PM May 23, 2013Observed: 27.43 ft at 10:30PM May 23, 2013Observed: 27.42 ft at 11:00PM May 23, 2013Observed: 27.4 ft at 11:30PM May 23, 2013Observed: 27.39 ft at 12:00AM May 24, 2013Observed: 27.38 ft at 12:30AM May 24, 2013Observed: 27.36 ft at 1:00AM May 24, 2013Observed: 27.35 ft at 1:30AM May 24, 2013Observed: 27.34 ft at 2:00AM May 24, 2013Observed: 27.32 ft at 2:30AM May 24, 2013Observed: 27.31 ft at 3:00AM May 24, 2013Observed: 27.3 ft at 3:30AM May 24, 2013Observed: 27.28 ft at 4:00AM May 24, 2013Observed: 27.27 ft at 4:30AM May 24, 2013Observed: 27.26 ft at 5:00AM May 24, 2013Observed: 27.25 ft at 5:30AM May 24, 2013Observed: 27.24 ft at 6:00AM May 24, 2013Observed: 27.22 ft at 6:30AM May 24, 2013Observed: 27.2 ft at 7:00AM May 24, 2013Observed: 27.19 ft at 7:30AM May 24, 2013Observed: 27.18 ft at 8:00AM May 24, 2013Observed: 27.16 ft at 8:30AM May 24, 2013Observed: 27.15 ft at 9:00AM May 24, 2013Observed: 27.14 ft at 9:30AM May 24, 2013Observed: 27.13 ft at 10:00AM May 24, 2013Observed: 27.12 ft at 10:30AM May 24, 2013Observed: 27.1 ft at 11:00AM May 24, 2013Observed: 27.09 ft at 11:30AM May 24, 2013Observed: 27.08 ft at 12:00PM May 24, 2013Observed: 27.06 ft at 12:30PM May 24, 2013Observed: 27.05 ft at 1:00PM May 24, 2013Observed: 27.04 ft at 1:30PM May 24, 2013Observed: 27.03 ft at 2:00PM May 24, 2013Observed: 27.02 ft at 2:30PM May 24, 2013Observed: 27 ft at 3:00PM May 24, 2013Observed: 26.99 ft at 3:30PM May 24, 2013Observed: 26.98 ft at 4:00PM May 24, 2013Observed: 26.96 ft at 4:30PM May 24, 2013Observed: 26.95 ft at 5:00PM May 24, 2013Observed: 26.94 ft at 5:30PM May 24, 2013Observed: 26.93 ft at 6:00PM May 24, 2013Observed: 26.92 ft at 6:30PM May 24, 2013Observed: 26.9 ft at 7:00PM May 24, 2013Observed: 26.89 ft at 7:30PM May 24, 2013Observed: 26.88 ft at 8:00PM May 24, 2013Observed: 26.87 ft at 8:30PM May 24, 2013Observed: 26.86 ft at 9:00PM May 24, 2013Observed: 26.84 ft at 9:30PM May 24, 2013Observed: 26.83 ft at 10:00PM May 24, 2013Observed: 26.82 ft at 10:30PM May 24, 2013Observed: 26.81 ft at 11:00PM May 24, 2013Observed: 26.8 ft at 11:30PM May 24, 2013Observed: 26.79 ft at 12:00AM May 25, 2013Observed: 26.78 ft at 12:30AM May 25, 2013Observed: 26.76 ft at 1:00AM May 25, 2013Observed: 26.76 ft at 1:30AM May 25, 2013Observed: 26.74 ft at 2:00AM May 25, 2013Observed: 26.73 ft at 2:30AM May 25, 2013Observed: 26.72 ft at 3:00AM May 25, 2013Observed: 26.71 ft at 3:30AM May 25, 2013Observed: 26.7 ft at 4:00AM May 25, 2013Observed: 26.69 ft at 4:30AM May 25, 2013Observed: 26.67 ft at 5:00AM May 25, 2013Observed: 26.66 ft at 5:30AM May 25, 2013Observed: 26.65 ft at 6:00AM May 25, 2013Observed: 26.64 ft at 6:30AM May 25, 2013Observed: 26.63 ft at 7:00AM May 25, 2013Observed: 26.62 ft at 7:30AM May 25, 2013Observed: 26.6 ft at 8:00AM May 25, 2013Observed: 26.59 ft at 8:30AM May 25, 2013Observed: 26.58 ft at 9:00AM May 25, 2013Observed: 26.57 ft at 9:30AM May 25, 2013Observed: 26.56 ft at 10:00AM May 25, 2013Observed: 26.55 ft at 10:30AM May 25, 2013Observed: 26.54 ft at 11:00AM May 25, 2013Observed: 26.53 ft at 11:30AM May 25, 2013Observed: 26.52 ft at 12:00PM May 25, 2013Observed: 26.52 ft at 12:30PM May 25, 2013Observed: 26.51 ft at 1:00PM May 25, 2013Observed: 26.5 ft at 1:30PM May 25, 2013Observed: 26.49 ft at 2:00PM May 25, 2013Observed: 26.48 ft at 2:30PM May 25, 2013Observed: 26.48 ft at 3:00PM May 25, 2013Observed: 26.47 ft at 3:30PM May 25, 2013Observed: 26.46 ft at 4:00PM May 25, 2013Observed: 26.45 ft at 4:30PM May 25, 2013Observed: 26.45 ft at 5:00PM May 25, 2013Observed: 26.44 ft at 5:30PM May 25, 2013Highest Forecast: 26.4 ft 7:00PM May 25, 2013Forecast: 26.3 ft 1:00AM May 26, 2013Forecast: 26.2 ft 7:00AM May 26, 2013Forecast: 26.1 ft 1:00PM May 26, 2013Forecast: 26 ft 7:00PM May 26, 2013Forecast: 26 ft 1:00AM May 27, 2013Forecast: 25.9 ft 7:00AM May 27, 2013Forecast: 25.9 ft 1:00PM May 27, 2013Forecast: 25.9 ft 7:00PM May 27, 2013Forecast: 25.9 ft 1:00AM May 28, 2013Forecast: 25.9 ft 7:00AM May 28, 2013Forecast: 25.9 ft 1:00PM May 28, 2013Forecast: 25.9 ft 7:00PM May 28, 2013Forecast: 25.9 ft 1:00AM May 29, 2013Forecast: 25.9 ft 7:00AM May 29, 2013Forecast: 25.9 ft 1:00PM May 29, 2013Forecast: 25.9 ft 7:00PM May 29, 2013Forecast: 25.9 ft 1:00AM May 30, 2013Forecast: 25.9 ft 7:00AM May 30, 2013Forecast: 26 ft 1:00PM May 30, 2013Forecast: 26 ft 7:00PM May 30, 2013Forecast: 26 ft 1:00AM May 31, 2013Forecast: 26 ft 7:00AM May 31, 2013Forecast: 26 ft 1:00PM May 31, 2013Forecast: 26 ft 7:00PM May 31, 2013Forecast: 26 ft 1:00AM Jun 01, 2013Forecast: 26 ft 7:00AM Jun 01, 2013Forecast: 25.9 ft 1:00PM Jun 01, 2013CLKM7(plotting HTIRG) Graph Created (5:54PM May 25, 2013)ObservedForecast (issued 10:47AM May 25)Latest observed value: 26.44 ft at 5:30 PM CDT 25-May-2013. Flood Stage is 25 ft
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About this graph
Tabular Data
XML Data
RSS Files
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: Forecasts for the Mississippi River at Clarksville Lock and Dam 24 are issued routinely year-round.

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Upstream Gauge - at Louisiana Upstream Gauge Downstream Gauge Downstream Gauge - at Winfield Lock and Dam 25
Flood Categories (in feet)
Major Flood Stage:33
Moderate Flood Stage:31
Flood Stage:25
Action Stage:23

Historical Crests
(1) 37.73 ft on 07/29/1993
(2) 36.76 ft on 04/24/1973
(3) 36.70 ft on 06/24/2008
(4) 34.70 ft on 05/16/2001
(5) 33.70 ft on 10/05/1986
(6) 33.24 ft on 04/06/1983
(7) 32.70 ft on 05/30/1996
(8) 32.44 ft on 04/13/1979
(9) 32.40 ft on 04/17/1998
(10) 32.20 ft on 04/25/1993
Show More Historical Crests

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
Legend
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 Collapse
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. Also Route W is closed at Highway 79 in Clarksville for one block.
33.2 IL route 96 near Mozier inundated.
33.1 Route N is closed between Route D and Highway 79.
33 Clarksville city businesses from 1st Street to 3rd Street begin to flood.
31.5 Burlington Northern SF railroad tracks begin to flood. Also, Highway 79 closes one mile south of Clarksville.
31 The Clarksville Boat Club, south of Lock & Dam 24, begins to flood. First Street begins flooding. In Hamburg, Illinois, Water Street floods.
30 East bank (Illinois side) begins to flood. Highway 79 one mile south of Clarksville 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, 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 Collapse

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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 422 ft 447 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 Collapse
How low could the river get?
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Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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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