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Hydrograph River at a Glance Download  
Illinois River at Lagrange Observed crest: 21.8 ft at 12:00am Feb 05 Observed: 23.09 ft at 4:00am Jan 31 Observed: 23.06 ft at 6:00am Jan 31 Observed: 23.03 ft at 8:00am Jan 31 Observed: 23.02 ft at 10:00am Jan 31 Observed: 23 ft at 12:00pm Jan 31 Observed: 22.98 ft at 2:00pm Jan 31 Observed: 22.98 ft at 4:00pm Jan 31 Observed: 22.94 ft at 6:00pm Jan 31 Observed: 22.94 ft at 8:00pm Jan 31 Observed: 22.95 ft at 10:00pm Jan 31 Observed: 22.9 ft at 12:00am Feb 1 Observed: 22.9 ft at 2:00am Feb 1 Observed: 22.89 ft at 4:00am Feb 1 Observed: 22.89 ft at 6:00am Feb 1 Observed: 22.88 ft at 8:00am Feb 1 Observed: 22.86 ft at 10:00am Feb 1 Observed: 22.85 ft at 12:00pm Feb 1 Observed: 22.83 ft at 2:00pm Feb 1 Observed: 22.9 ft at 4:00pm Feb 1 Observed: 22.89 ft at 6:00pm Feb 1 Observed: 22.88 ft at 8:00pm Feb 1 Observed: 22.8 ft at 10:00pm Feb 1 Observed: 22.88 ft at 12:00am Feb 2 Observed: 22.81 ft at 2:00am Feb 2 Observed: 22.74 ft at 4:00am Feb 2 Observed: 22.65 ft at 6:00am Feb 2 Observed: 22.6 ft at 8:00am Feb 2 Observed: 22.55 ft at 10:00am Feb 2 Observed: 22.5 ft at 12:00pm Feb 2 Observed: 22.45 ft at 2:00pm Feb 2 Observed: 22.45 ft at 4:00pm Feb 2 Observed: 22.5 ft at 6:00pm Feb 2 Observed: 22.45 ft at 8:00pm Feb 2 Observed: 22.45 ft at 10:00pm Feb 2 Observed: 22.53 ft at 12:00am Feb 3 Observed: 22.51 ft at 2:00am Feb 3 Observed: 22.48 ft at 4:00am Feb 3 Observed: 22.46 ft at 6:00am Feb 3 Observed: 22.48 ft at 8:00am Feb 3 Observed: 22.45 ft at 10:00am Feb 3 Observed: 22.39 ft at 12:00pm Feb 3 Observed: 22.3 ft at 2:00pm Feb 3 Observed: 22.28 ft at 4:00pm Feb 3 Observed: 22.25 ft at 6:00pm Feb 3 Observed: 22.21 ft at 8:00pm Feb 3 Observed: 22.15 ft at 10:00pm Feb 3 Observed: 22.15 ft at 12:00am Feb 4 Observed: 22.13 ft at 2:00am Feb 4 Observed: 22.1 ft at 4:00am Feb 4 Observed: 22.07 ft at 6:00am Feb 4 Observed: 22.02 ft at 8:00am Feb 4 Observed: 22 ft at 10:00am Feb 4 Observed: 21.98 ft at 12:00pm Feb 4 Observed: 21.96 ft at 2:00pm Feb 4 Observed: 21.86 ft at 6:00pm Feb 4 Observed: 21.82 ft at 8:00pm Feb 4 Observed: 21.82 ft at 10:00pm Feb 4 Observed: 21.8 ft at 12:00am Feb 5 Observed: 21.79 ft at 2:00am Feb 5 Observed: 21.78 ft at 4:00am Feb 5 Observed: 21.72 ft at 6:00am Feb 5 Observed: 21.66 ft at 8:00am Feb 5 Observed: 21.6 ft at 10:00am Feb 5 Observed: 21.55 ft at 12:00pm Feb 5 Observed: 21.6 ft at 2:00pm Feb 5 Observed: 21.59 ft at 4:00pm Feb 5 Observed: 21.55 ft at 6:00pm Feb 5 Observed: 21.52 ft at 8:00pm Feb 5 Observed: 21.5 ft at 10:00pm Feb 5 Observed: 21.5 ft at 12:00am Feb 6 Observed: 21.48 ft at 2:00am Feb 6 Observed: 21.44 ft at 4:00am Feb 6 Observed: 21.4 ft at 6:00am Feb 6 Observed: 21.35 ft at 8:00am Feb 6 Observed: 21.3 ft at 10:00am Feb 6 Observed: 21.28 ft at 12:00pm Feb 6 Observed: 21.23 ft at 2:00pm Feb 6 Observed: 21.2 ft at 4:00pm Feb 6 Observed: 21.16 ft at 6:00pm Feb 6 Observed: 21.11 ft at 8:00pm Feb 6 Observed: 21.09 ft at 10:00pm Feb 6 Observed: 21.02 ft at 12:00am Feb 7 Observed: 21 ft at 2:00am Feb 7 Observed: 21 ft at 4:00am Feb 7 Observed: 20.95 ft at 6:00am Feb 7 Observed: 20.95 ft at 8:00am Feb 7 Observed: 20.95 ft at 10:00am Feb 7 Observed: 20.91 ft at 12:00pm Feb 7 Observed: 20.85 ft at 2:00pm Feb 7 Observed: 20.81 ft at 4:00pm Feb 7 Observed: 20.76 ft at 6:00pm Feb 7 Observed: 20.73 ft at 8:00pm Feb 7 Observed: 20.7 ft at 10:00pm Feb 7 Observed: 20.7 ft at 12:00am Feb 8 Observed: 20.68 ft at 2:00am Feb 8 Observed: 20.66 ft at 4:00am Feb 8 Observed: 20.63 ft at 6:00am Feb 8 Observed: 20.6 ft at 8:00am Feb 8 Observed: 20.57 ft at 10:00am Feb 8 Observed: 20.55 ft at 12:00pm Feb 8 Observed: 20.52 ft at 2:00pm Feb 8 Observed: 20.5 ft at 4:00pm Feb 8 Observed: 20.49 ft at 6:00pm Feb 8 Observed: 20.47 ft at 8:00pm Feb 8 Observed: 20.45 ft at 10:00pm Feb 8 Observed: 20.45 ft at 12:00am Feb 9 Observed: 20.42 ft at 2:00am Feb 9 Observed: 20.39 ft at 4:00am Feb 9 Observed: 20.37 ft at 6:00am Feb 9 Observed: 20.35 ft at 8:00am Feb 9 Observed: 20.33 ft at 10:00am Feb 9 Observed: 20.32 ft at 12:00pm Feb 9 Observed: 20.3 ft at 2:00pm Feb 9 Observed: 20.25 ft at 4:00pm Feb 9 Observed: 20.22 ft at 6:00pm Feb 9 Observed: 20.18 ft at 8:00pm Feb 9 Observed: 20.15 ft at 10:00pm Feb 9 Observed: 19.8 ft at 12:00am Feb 10 Observed: 19.86 ft at 2:00am Feb 10 Forecast: 20.2 ft at 12:00pm Feb 9 Forecast: 20.1 ft at 6:00pm Feb 9 Forecast: 20 ft at 12:00am Feb 10 Forecast: 19.9 ft at 6:00am Feb 10 Forecast: 19.8 ft at 12:00pm Feb 10 Forecast: 19.7 ft at 6:00pm Feb 10 Forecast: 19.6 ft at 12:00am Feb 11 Forecast: 19.5 ft at 6:00am Feb 11 Forecast: 19.4 ft at 12:00pm Feb 11 Forecast: 19.3 ft at 6:00pm Feb 11 Forecast: 19.2 ft at 12:00am Feb 12 Forecast: 19 ft at 6:00am Feb 12 Forecast: 18.9 ft at 12:00pm Feb 12 Forecast: 18.8 ft at 6:00pm Feb 12 Forecast: 18.7 ft at 12:00am Feb 13 Forecast: 18.6 ft at 6:00am Feb 13 Forecast: 18.5 ft at 12:00pm Feb 13 Forecast: 18.4 ft at 6:00pm Feb 13 Forecast: 18.2 ft at 12:00am Feb 14 Forecast: 18.1 ft at 6:00am Feb 14 Forecast: 18 ft at 12:00pm Feb 14 Forecast: 17.9 ft at 6:00pm Feb 14 Forecast: 17.8 ft at 12:00am Feb 15 Forecast: 17.7 ft at 6:00am Feb 15 Forecast: 17.5 ft at 12:00pm Feb 15 Forecast: 17.4 ft at 6:00pm Feb 15 Forecast: 17.3 ft at 12:00am Feb 16 Forecast: 17.1 ft at 6:00am Feb 16 Graph Created (3:49am Feb 10, 2010) Observed Forecast (issued 9:56am Feb 9) NLGI2 (plotting HTIRV) Gage 0 Datum: 413.50 Latest observed value: 19.86 ft at 2:00 AM CST 10-Feb-2010. Flood Stage is 23.0 ft. Forecast data shown here are guidance values only. Please refer to your local NWS office for the latest official public river forecasts. Flow (kcfs)
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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 Lagrange are issued routinely year-round.

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Upstream Gauge - at Beardstown Upstream Gauge Downstream Gauge Downstream Gauge - at Meredosia

Flood Categories (in feet)
Major Flood Stage:29
Moderate Flood Stage:27
Flood Stage:23
Action Stage:21

Historical Crests
(1) 34.02 ft on 06/01/1995
(2) 32.80 ft on 04/19/1979
(3) 32.00 ft on 07/29/1993
(3) 32.00 ft on 04/29/1973
(3) 32.00 ft on 05/22/2009
Show More Historical Crests

Low Water Records
Currently none available.

Illinois River at Lagrange location map

Flood Impacts Collapse
429.0 Normal pool level.
427.5 Dam goes up at this pool level.
36.0 Lockmasters house and the lower Corps building at the lock and dam begin flooding.
35.5 LaGrange Road (County Highway 12) is flooded south of LaGrange Lock and Dam.
29.5 La Grange Lock Road (County Road 1730N) is flooded just north of the Lock and Dam.
28.8 County Road 500N south of La Grange is closed due to flooding.
24.0 Extensive wetland acreage south of La Grange begins flooding.
23.0 Adjacent farmland and wetlands begins flooding. Island Road across the river in western Cass County begins flooding.
20.5 The lock wall is completely overtopped.
16.5 The earthen part of the dam is overtopped.

About This Location Collapse
Latitude: 39.940000° N, Longitude: 90.534000° W, Horizontal Datum: NAD83

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 23 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 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 N/A N/A Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other 413.5 ft 436.5 ft  

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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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