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Hydrograph River at a Glance Download
Illinois River at Meredosia Stage (ft)Observed: 2.6 ft at 11:30PM Sep 18, 2023Observed: 2.6 ft at 12:00AM Sep 19, 2023Observed: 2.6 ft at 12:30AM Sep 19, 2023Observed: 2.61 ft at 1:00AM Sep 19, 2023Observed: 2.6 ft at 1:30AM Sep 19, 2023Observed: 2.61 ft at 2:00AM Sep 19, 2023Observed: 2.6 ft at 2:30AM Sep 19, 2023Observed: 2.61 ft at 3:00AM Sep 19, 2023Observed: 2.62 ft at 4:00AM Sep 19, 2023Observed: 2.62 ft at 4:30AM Sep 19, 2023Observed: 2.62 ft at 5:00AM Sep 19, 2023Observed: 2.63 ft at 5:30AM Sep 19, 2023Observed: 2.63 ft at 6:00AM Sep 19, 2023Observed: 2.63 ft at 6:30AM Sep 19, 2023Observed: 2.65 ft at 7:00AM Sep 19, 2023Observed: 2.65 ft at 7:30AM Sep 19, 2023Observed: 2.65 ft at 8:00AM Sep 19, 2023Observed: 2.66 ft at 8:30AM Sep 19, 2023Observed: 2.66 ft at 9:00AM Sep 19, 2023Observed: 2.68 ft at 9:30AM Sep 19, 2023Observed: 2.7 ft at 10:00AM Sep 19, 2023Observed: 2.72 ft at 10:30AM Sep 19, 2023Observed: 2.72 ft at 11:00AM Sep 19, 2023Observed: 2.74 ft at 11:30AM Sep 19, 2023Observed: 2.77 ft at 12:00PM Sep 19, 2023Observed: 2.78 ft at 12:30PM Sep 19, 2023Observed: 2.79 ft at 1:00PM Sep 19, 2023Observed: 2.81 ft at 1:30PM Sep 19, 2023Observed: 2.81 ft at 2:00PM Sep 19, 2023Observed: 2.84 ft at 3:00PM Sep 19, 2023Observed: 2.85 ft at 3:30PM Sep 19, 2023Observed: 2.85 ft at 4:00PM Sep 19, 2023Observed: 2.89 ft at 4:30PM Sep 19, 2023Observed: 2.9 ft at 5:00PM Sep 19, 2023Observed: 2.91 ft at 5:30PM Sep 19, 2023Observed: 2.93 ft at 6:00PM Sep 19, 2023Observed: 2.94 ft at 6:30PM Sep 19, 2023Observed: 2.96 ft at 7:00PM Sep 19, 2023Observed: 2.98 ft at 7:30PM Sep 19, 2023Observed: 3.05 ft at 8:00PM Sep 19, 2023Observed: 3.05 ft at 8:30PM Sep 19, 2023Observed: 3.04 ft at 9:00PM Sep 19, 2023Observed: 3.07 ft at 9:30PM Sep 19, 2023Observed: 3.08 ft at 10:00PM Sep 19, 2023Observed: 3.07 ft at 10:30PM Sep 19, 2023Observed: 3.09 ft at 11:00PM Sep 19, 2023Observed: 3.1 ft at 11:30PM Sep 19, 2023Observed: 3.11 ft at 12:00AM Sep 20, 2023Observed: 3.11 ft at 12:30AM Sep 20, 2023Observed: 3.11 ft at 1:00AM Sep 20, 2023Observed: 3.12 ft at 1:30AM Sep 20, 2023Observed: 3.1 ft at 2:00AM Sep 20, 2023Observed: 3.09 ft at 2:30AM Sep 20, 2023Observed: 3.09 ft at 3:00AM Sep 20, 2023Observed: 3.08 ft at 3:30AM Sep 20, 2023Observed: 3.07 ft at 4:00AM Sep 20, 2023Observed: 3.07 ft at 4:30AM Sep 20, 2023Observed: 3.07 ft at 5:00AM Sep 20, 2023Observed: 3.08 ft at 5:30AM Sep 20, 2023Observed: 3.08 ft at 6:00AM Sep 20, 2023Observed: 3.07 ft at 6:30AM Sep 20, 2023Observed: 3.07 ft at 7:00AM Sep 20, 2023Observed: 3.07 ft at 7:30AM Sep 20, 2023Observed: 3.08 ft at 8:00AM Sep 20, 2023Observed: 3.08 ft at 8:30AM Sep 20, 2023Observed: 3.08 ft at 9:30AM Sep 20, 2023Observed: 3.09 ft at 10:00AM Sep 20, 2023Observed: 3.12 ft at 10:30AM Sep 20, 2023Observed: 3.12 ft at 11:00AM Sep 20, 2023Observed: 3.04 ft at 11:30AM Sep 20, 2023Observed: 3.02 ft at 12:00PM Sep 20, 2023Observed: 3 ft at 12:30PM Sep 20, 2023Observed: 2.98 ft at 1:00PM Sep 20, 2023Observed: 2.97 ft at 1:30PM Sep 20, 2023Observed: 2.97 ft at 2:00PM Sep 20, 2023Observed: 2.96 ft at 2:30PM Sep 20, 2023Observed: 2.96 ft at 3:00PM Sep 20, 2023Observed: 2.95 ft at 3:30PM Sep 20, 2023Observed: 2.99 ft at 4:00PM Sep 20, 2023Observed: 2.99 ft at 4:30PM Sep 20, 2023Observed: 2.97 ft at 5:00PM Sep 20, 2023Observed: 2.96 ft at 5:30PM Sep 20, 2023Observed: 2.98 ft at 6:00PM Sep 20, 2023Observed: 3.04 ft at 6:30PM Sep 20, 2023Observed: 3.04 ft at 7:00PM Sep 20, 2023Observed: 3.04 ft at 7:30PM Sep 20, 2023Observed: 3.05 ft at 8:00PM Sep 20, 2023Observed: 3.03 ft at 8:30PM Sep 20, 2023Observed: 3.04 ft at 9:00PM Sep 20, 2023Observed: 3.04 ft at 9:30PM Sep 20, 2023Observed: 3.05 ft at 10:00PM Sep 20, 2023Observed: 3.05 ft at 10:30PM Sep 20, 2023Observed: 3.04 ft at 11:00PM Sep 20, 2023Observed: 3.05 ft at 11:30PM Sep 20, 2023Observed: 3.06 ft at 12:00AM Sep 21, 2023Observed: 3.08 ft at 12:30AM Sep 21, 2023Observed: 3.09 ft at 1:00AM Sep 21, 2023Observed: 3.11 ft at 1:30AM Sep 21, 2023Observed: 3.03 ft at 2:00AM Sep 21, 2023Observed: 3.08 ft at 2:30AM Sep 21, 2023Observed: 3.07 ft at 3:00AM Sep 21, 2023Observed: 3.07 ft at 3:30AM Sep 21, 2023Observed: 3.05 ft at 4:00AM Sep 21, 2023Observed: 3.08 ft at 4:30AM Sep 21, 2023Observed: 3.11 ft at 5:00AM Sep 21, 2023Observed: 3.07 ft at 5:30AM Sep 21, 2023Observed: 3.08 ft at 6:00AM Sep 21, 2023Observed: 3.15 ft at 6:30AM Sep 21, 2023Observed: 3.09 ft at 7:30AM Sep 21, 2023Observed: 3.09 ft at 8:00AM Sep 21, 2023Observed: 3.09 ft at 8:30AM Sep 21, 2023Observed: 3.13 ft at 9:00AM Sep 21, 2023Observed: 3.16 ft at 9:30AM Sep 21, 2023Observed: 3.17 ft at 10:00AM Sep 21, 2023Observed: 3.18 ft at 10:30AM Sep 21, 2023Observed: 3.2 ft at 11:00AM Sep 21, 2023Observed: 3.21 ft at 11:30AM Sep 21, 2023Observed: 3.23 ft at 12:30PM Sep 21, 2023Observed: 3.28 ft at 1:00PM Sep 21, 2023Observed: 3.3 ft at 1:30PM Sep 21, 2023Observed: 3.31 ft at 2:00PM Sep 21, 2023Observed: 3.33 ft at 2:30PM Sep 21, 2023Observed: 3.34 ft at 3:00PM Sep 21, 2023Observed: 3.35 ft at 3:30PM Sep 21, 2023Observed: 3.38 ft at 4:30PM Sep 21, 2023Observed: 3.4 ft at 5:00PM Sep 21, 2023Observed: 3.42 ft at 5:30PM Sep 21, 2023Observed: 3.45 ft at 6:00PM Sep 21, 2023Observed: 3.49 ft at 6:30PM Sep 21, 2023Observed: 3.49 ft at 7:00PM Sep 21, 2023Observed: 3.51 ft at 7:30PM Sep 21, 2023Observed: 3.52 ft at 8:00PM Sep 21, 2023Observed: 3.53 ft at 8:30PM Sep 21, 2023Observed: 3.55 ft at 9:00PM Sep 21, 2023Observed: 3.54 ft at 9:30PM Sep 21, 2023Observed: 3.54 ft at 10:00PM Sep 21, 2023Observed: 3.57 ft at 10:30PM Sep 21, 2023Observed: 3.55 ft at 11:00PM Sep 21, 2023Observed: 3.55 ft at 11:30PM Sep 21, 2023Observed: 3.56 ft at 12:00AM Sep 22, 2023Observed: 3.57 ft at 12:30AM Sep 22, 2023Observed: 3.58 ft at 1:00AM Sep 22, 2023Observed: 3.59 ft at 1:30AM Sep 22, 2023Observed: 3.59 ft at 2:00AM Sep 22, 2023Observed: 3.6 ft at 2:30AM Sep 22, 2023Observed: 3.61 ft at 3:30AM Sep 22, 2023Observed: 3.62 ft at 4:00AM Sep 22, 2023Observed: 3.62 ft at 4:30AM Sep 22, 2023Observed: 3.64 ft at 5:00AM Sep 22, 2023Observed: 3.65 ft at 5:30AM Sep 22, 2023Observed: 3.65 ft at 6:00AM Sep 22, 2023Observed: 3.67 ft at 6:30AM Sep 22, 2023Observed: 3.65 ft at 7:00AM Sep 22, 2023Observed: 3.65 ft at 7:30AM Sep 22, 2023Observed: 3.64 ft at 8:00AM Sep 22, 2023Observed: 3.65 ft at 8:30AM Sep 22, 2023Observed: 3.65 ft at 9:00AM Sep 22, 2023Observed: 3.65 ft at 9:30AM Sep 22, 2023Observed: 3.66 ft at 10:00AM Sep 22, 2023Observed: 3.66 ft at 10:30AM Sep 22, 2023Observed: 3.68 ft at 11:00AM Sep 22, 2023Observed: 3.69 ft at 11:30AM Sep 22, 2023Observed: 3.69 ft at 12:00PM Sep 22, 2023Observed: 3.67 ft at 12:30PM Sep 22, 2023Observed: 3.69 ft at 1:00PM Sep 22, 2023Observed: 3.66 ft at 1:30PM Sep 22, 2023Observed: 3.67 ft at 2:00PM Sep 22, 2023Observed: 3.68 ft at 2:30PM Sep 22, 2023Observed: 3.67 ft at 3:00PM Sep 22, 2023Observed: 3.69 ft at 3:30PM Sep 22, 2023Observed: 3.69 ft at 4:00PM Sep 22, 2023Observed: 3.7 ft at 4:30PM Sep 22, 2023Observed: 3.73 ft at 5:00PM Sep 22, 2023Observed: 3.71 ft at 5:30PM Sep 22, 2023Observed: 3.73 ft at 6:00PM Sep 22, 2023Observed: 3.73 ft at 6:30PM Sep 22, 2023Observed: 3.72 ft at 7:00PM Sep 22, 2023Observed: 3.73 ft at 7:30PM Sep 22, 2023Observed: 3.75 ft at 8:00PM Sep 22, 2023Observed: 3.71 ft at 8:30PM Sep 22, 2023Observed: 3.72 ft at 9:00PM Sep 22, 2023Observed: 3.74 ft at 9:30PM Sep 22, 2023Observed: 3.72 ft at 10:00PM Sep 22, 2023Observed: 3.71 ft at 10:30PM Sep 22, 2023Observed: 3.72 ft at 11:00PM Sep 22, 2023Observed: 3.63 ft at 11:30PM Sep 22, 2023Observed: 3.71 ft at 12:30AM Sep 23, 2023Observed: 3.71 ft at 1:00AM Sep 23, 2023Observed: 3.7 ft at 1:30AM Sep 23, 2023Observed: 3.76 ft at 2:00AM Sep 23, 2023Observed: 3.73 ft at 2:30AM Sep 23, 2023Observed: 3.73 ft at 3:00AM Sep 23, 2023Observed: 3.73 ft at 3:30AM Sep 23, 2023Observed: 3.73 ft at 4:00AM Sep 23, 2023Observed: 3.78 ft at 4:30AM Sep 23, 2023Observed: 3.74 ft at 5:00AM Sep 23, 2023Observed: 3.74 ft at 5:30AM Sep 23, 2023Observed: 3.75 ft at 6:00AM Sep 23, 2023Observed: 3.76 ft at 6:30AM Sep 23, 2023Observed: 3.76 ft at 7:00AM Sep 23, 2023Observed: 3.76 ft at 7:30AM Sep 23, 2023Observed: 3.78 ft at 8:00AM Sep 23, 2023Observed: 3.79 ft at 8:30AM Sep 23, 2023Observed: 3.79 ft at 9:00AM Sep 23, 2023Observed: 3.79 ft at 9:30AM Sep 23, 2023Observed: 3.85 ft at 10:30AM Sep 23, 2023Observed: 3.87 ft at 11:00AM Sep 23, 2023Observed: 3.96 ft at 11:30AM Sep 23, 2023Observed: 4.01 ft at 12:00PM Sep 23, 2023Observed: 4.02 ft at 12:30PM Sep 23, 2023Observed: 4.07 ft at 1:30PM Sep 23, 2023Observed: 4.08 ft at 2:00PM Sep 23, 2023Observed: 4.1 ft at 2:30PM Sep 23, 2023Observed: 4.12 ft at 3:00PM Sep 23, 2023Observed: 4.13 ft at 3:30PM Sep 23, 2023Observed: 4.16 ft at 4:00PM Sep 23, 2023Observed: 4.17 ft at 4:30PM Sep 23, 2023Observed: 4.19 ft at 5:00PM Sep 23, 2023Observed: 4.2 ft at 5:30PM Sep 23, 2023Observed: 4.19 ft at 6:00PM Sep 23, 2023Highest Observation: 4.21 ft at 6:30PM Sep 23, 2023Observed: 4.18 ft at 7:00PM Sep 23, 2023Observed: 4.05 ft at 7:30PM Sep 23, 2023Observed: 4.18 ft at 8:00PM Sep 23, 2023Observed: 4.18 ft at 8:30PM Sep 23, 2023Observed: 4.18 ft at 9:00PM Sep 23, 2023Observed: 4.19 ft at 9:30PM Sep 23, 2023Observed: 4.2 ft at 10:00PM Sep 23, 2023Observed: 4.19 ft at 10:30PM Sep 23, 2023Highest Forecast: 4.2 ft 1:00AM Sep 24, 2023Highest Forecast: 4.2 ft 7:00AM Sep 24, 2023Forecast: 4.1 ft 1:00PM Sep 24, 2023Forecast: 4 ft 7:00PM Sep 24, 2023Forecast: 4 ft 1:00AM Sep 25, 2023Forecast: 4 ft 7:00AM Sep 25, 2023Forecast: 4.1 ft 1:00PM Sep 25, 2023Forecast: 4.1 ft 7:00PM Sep 25, 2023Forecast: 4.1 ft 1:00AM Sep 26, 2023Forecast: 4.1 ft 7:00AM Sep 26, 2023Forecast: 4.1 ft 1:00PM Sep 26, 2023Forecast: 4.1 ft 7:00PM Sep 26, 2023Forecast: 4.1 ft 1:00AM Sep 27, 2023Forecast: 4 ft 7:00AM Sep 27, 2023Forecast: 4 ft 1:00PM Sep 27, 2023Forecast: 3.9 ft 7:00PM Sep 27, 2023Forecast: 3.9 ft 1:00AM Sep 28, 2023Forecast: 3.8 ft 7:00AM Sep 28, 2023Forecast: 3.8 ft 1:00PM Sep 28, 2023Forecast: 3.8 ft 7:00PM Sep 28, 2023Forecast: 3.8 ft 1:00AM Sep 29, 2023Forecast: 3.7 ft 7:00AM Sep 29, 2023Forecast: 3.7 ft 1:00PM Sep 29, 2023Forecast: 3.7 ft 7:00PM Sep 29, 2023Forecast: 3.7 ft 1:00AM Sep 30, 2023Forecast: 3.7 ft 7:00AM Sep 30, 2023Forecast: 3.7 ft 1:00PM Sep 30, 2023Forecast: 3.7 ft 7:00PM Sep 30, 2023USGS--Water Resources of the United StatesMROI2(plotting HGIRG) Graph Created (11:11PM Sep 23, 2023)ObservedForecast (issued 7:49PM Sep 23)Latest observed value: 4.19 ft at 10:30 PM CDT 23-Sep-2023. Flood Stage is 17 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NGVD29
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 Illinois River at Meredosia are issued routinely year-round.

Return to Area Map
Upstream Gauge - at LaGrange Lock and Dam Upstream Gauge Downstream Gauge Downstream Gauge - at Valley City
Flood Categories (in feet)
Major Flood Stage: 24
Moderate Flood Stage: 22
Flood Stage: 17
Action Stage: 14
Low Stage (in feet): -9999

Historic Crests
(1) 28.86 ft on 07/02/2015
(2) 28.70 ft on 05/26/1943
(3) 28.69 ft on 04/27/2013
(4) 28.39 ft on 06/04/2019
(5) 28.30 ft on 05/30/1995
(6) 28.03 ft on 01/05/2016
(7) 27.62 ft on 03/10/1985
(8) 27.57 ft on 05/19/2002
(9) 27.28 ft on 04/19/1979
(10) 26.96 ft on 07/28/1993
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 25.39 ft on 05/27/2020
(2) 17.45 ft on 01/22/2020
(3) 28.39 ft on 06/04/2019
(4) 20.69 ft on 04/04/2019
(5) 17.04 ft on 02/27/2019
(6) 17.68 ft on 02/18/2019
(7) 19.72 ft on 03/03/2018
(8) 23.90 ft on 05/08/2017
(9) 18.29 ft on 04/14/2017
(10) 28.03 ft on 01/05/2016
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -1.13 ft on 09/20/1879
(2) -1.13 ft on 09/06/1893
(3) 0.40 ft on 01/11/1940
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:14
KML Image
Gauge LocationGauge Map Marker
 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
If you notice any errors in the below information, please contact our Webmaster
38 Coon Run Levee is overtopped.
33.5 McGee Creek Levee is overtopped.
32 Mauvaise Terre Levee is overtopped.
31 Meredoisa Lake Levee is overtopped.
29.8 Burlington Northern Railroad tracks and Levee at route 104 overtop.
28 Scott County and Northern Meredoisa Levees are overtopped and flood fighting activities begin at Willow Creek Lake and Dam.
27 Flood fighting begins at Scott County... Coon Run... and Meredosia Lakes and Dams.
26.4 Flood Fighting begins at Valley City Lake and Dam and floodwaters overtop Little Creek Levee.
26 Damage begins to buildings in Meredosia. Also, the U.S. Coast Guard will consider closing the Illinois River between the LaGrange Lock and Dam and Montezuma.
25.7 Cemetary Road begins flooding west of Old Naples Road.
25.4 Flood Fighting begins at Little Creek Lake and Dam.
25 Smith Lake Road is flooded south of Meredosia.
24.7 County Roads 1625E and 1675E begin to flood northwest of Meredosia.
24 Kochs Lane east of Shady Acres begins flooding.
23 Flood fighting activities begin at Big Swan Lake and Dam.
22.4 Meredosia Lake Road overtopped.
22.2 Low roads in Florence overtopped.
22 Cargill Company in Florence begins flood fighting activities. Also, unloading operations are shut down at the Ameren power plant.
21 Chambers Road south of Naples floods at Mauvaise Terre Creek near this level.
20 Beach Road just north of Shady Acres floods near this height.
18 City of Meredosia plugs storm sewer outlets.
17.39 Meredosia boat dock floods.
13 Sunset Beach Road begins flooding about two miles north of Meredosia near this level.
1 At and below this height, barge traffic will need to consider lowering tonnage to avoid grounding.
Photos
(1) Levee at Naples on May 23, 2009 at a stage of 26.1 ft.
(2) Cemetary Road along the Morgan-Scott County line south of Meredosia on May 23, 2009 at 26.1 ft.
(3) Koch's Lane looking east toward Toe Head Road northeast of Meredosia on May 23, 2009 at 26.1 ft.
(4) Lake Drive in northern Meredosia on May 23, 2009 at a stage of 26.1 feet.
(5) North Meredosia home behind failed levee on May 23, 2009 at 26.1 feet.
(6) Brown County Road 1625 E northwest of Meredosia on May 23, 2009 at a stage of 26.1 ft.
(7) Chambers Road South of Naples, IL at Mauvaise Terre Creek on September 26, 2008 at 23.2 ft.
(8) End of Park St. in Meredosia on September 26, 2008 at a stage of 23.2 ft.
(9) Backyard alley east of Washington St. in Meredosia on September 26, 2008 at a stage of 23.2 ft.
(10) Beach Road 1mile north of Meredosia looking north on September 26, 2008 at a stage of 23.2 feet.
(11) Meredosia riverfront park on September 26, 2008 at a stage of 23.2 ft.
(12) Meredosia riverfront park on September 26, 2008 at a stage of 23.2 ft.
(13) Looking west across the Illinois River from the Meredosia gaging station at a stage of 13.5 ft.
(14) Looking downstream from the Meredosia gaging station at a stage of 13.5 ft.
(15) Meredosia wire weight gage.
(16) Meredosia wire weight gage looking down at a stage of 13.50 ft.
(17) Meredosia gaging shelter at the Ameren power plant.
About This Location Collapse

Latitude: 39.831192° N, Longitude: 90.559845° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 17 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 417.71 ft 434.71 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 418 435 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Additional Information Collapse
How low could the river get?
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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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