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Hydrograph River at a Glance Download
Illinois River at LaGrange Lock and Dam Tailwater (ft)Highest Observation: 10.59 ft at 4:30AM May 28, 2023Observed: 10.55 ft at 5:00AM May 28, 2023Observed: 10.52 ft at 5:30AM May 28, 2023Observed: 10.5 ft at 6:00AM May 28, 2023Observed: 10.5 ft at 6:30AM May 28, 2023Observed: 10.46 ft at 7:00AM May 28, 2023Observed: 10.45 ft at 7:30AM May 28, 2023Observed: 10.48 ft at 8:00AM May 28, 2023Observed: 10.41 ft at 8:30AM May 28, 2023Observed: 10.41 ft at 9:00AM May 28, 2023Observed: 10.39 ft at 9:30AM May 28, 2023Observed: 10.38 ft at 10:00AM May 28, 2023Observed: 10.39 ft at 10:30AM May 28, 2023Observed: 10.36 ft at 11:00AM May 28, 2023Observed: 10.34 ft at 11:30AM May 28, 2023Observed: 10.33 ft at 12:00PM May 28, 2023Observed: 10.35 ft at 12:30PM May 28, 2023Observed: 10.31 ft at 1:00PM May 28, 2023Observed: 10.29 ft at 1:30PM May 28, 2023Observed: 10.3 ft at 2:00PM May 28, 2023Observed: 10.29 ft at 2:30PM May 28, 2023Observed: 10.28 ft at 3:00PM May 28, 2023Observed: 10.26 ft at 4:00PM May 28, 2023Observed: 10.26 ft at 4:30PM May 28, 2023Observed: 10.25 ft at 5:00PM May 28, 2023Observed: 10.17 ft at 5:30PM May 28, 2023Observed: 10.13 ft at 6:00PM May 28, 2023Observed: 10.1 ft at 6:30PM May 28, 2023Observed: 10.08 ft at 7:00PM May 28, 2023Observed: 10.06 ft at 7:30PM May 28, 2023Observed: 10.04 ft at 8:00PM May 28, 2023Observed: 10 ft at 8:30PM May 28, 2023Observed: 9.99 ft at 9:00PM May 28, 2023Observed: 9.97 ft at 10:00PM May 28, 2023Observed: 9.98 ft at 10:30PM May 28, 2023Observed: 9.95 ft at 11:30PM May 28, 2023Observed: 9.93 ft at 12:00AM May 29, 2023Observed: 9.91 ft at 12:30AM May 29, 2023Observed: 9.96 ft at 1:00AM May 29, 2023Observed: 9.91 ft at 1:30AM May 29, 2023Observed: 9.9 ft at 2:00AM May 29, 2023Observed: 9.9 ft at 2:30AM May 29, 2023Observed: 9.87 ft at 3:00AM May 29, 2023Observed: 9.86 ft at 3:30AM May 29, 2023Observed: 9.84 ft at 4:00AM May 29, 2023Observed: 9.83 ft at 4:30AM May 29, 2023Observed: 9.81 ft at 5:00AM May 29, 2023Observed: 9.81 ft at 5:30AM May 29, 2023Observed: 9.81 ft at 6:00AM May 29, 2023Observed: 9.79 ft at 6:30AM May 29, 2023Observed: 9.79 ft at 7:30AM May 29, 2023Observed: 9.77 ft at 8:00AM May 29, 2023Observed: 9.76 ft at 8:30AM May 29, 2023Observed: 9.75 ft at 9:00AM May 29, 2023Observed: 9.74 ft at 9:30AM May 29, 2023Observed: 9.73 ft at 10:00AM May 29, 2023Observed: 9.73 ft at 10:30AM May 29, 2023Observed: 9.73 ft at 11:00AM May 29, 2023Observed: 9.72 ft at 11:30AM May 29, 2023Observed: 9.72 ft at 12:00PM May 29, 2023Observed: 9.73 ft at 12:30PM May 29, 2023Observed: 9.7 ft at 1:00PM May 29, 2023Observed: 9.7 ft at 1:30PM May 29, 2023Observed: 9.69 ft at 2:00PM May 29, 2023Observed: 9.69 ft at 2:30PM May 29, 2023Observed: 9.68 ft at 3:00PM May 29, 2023Observed: 9.68 ft at 4:00PM May 29, 2023Observed: 9.67 ft at 4:30PM May 29, 2023Observed: 9.65 ft at 5:00PM May 29, 2023Observed: 9.66 ft at 5:30PM May 29, 2023Observed: 9.65 ft at 6:00PM May 29, 2023Observed: 9.65 ft at 6:30PM May 29, 2023Observed: 9.64 ft at 7:00PM May 29, 2023Observed: 9.64 ft at 7:30PM May 29, 2023Observed: 9.63 ft at 8:00PM May 29, 2023Observed: 9.62 ft at 8:30PM May 29, 2023Observed: 9.63 ft at 9:00PM May 29, 2023Observed: 9.63 ft at 9:30PM May 29, 2023Observed: 9.64 ft at 10:00PM May 29, 2023Observed: 9.64 ft at 10:30PM May 29, 2023Observed: 9.63 ft at 11:30PM May 29, 2023Observed: 9.6 ft at 12:00AM May 30, 2023Observed: 9.61 ft at 12:30AM May 30, 2023Observed: 9.59 ft at 1:00AM May 30, 2023Observed: 9.61 ft at 1:30AM May 30, 2023Observed: 9.58 ft at 2:00AM May 30, 2023Observed: 9.62 ft at 2:30AM May 30, 2023Observed: 9.64 ft at 3:00AM May 30, 2023Observed: 9.59 ft at 3:30AM May 30, 2023Observed: 9.59 ft at 4:00AM May 30, 2023Observed: 9.59 ft at 4:30AM May 30, 2023Observed: 9.59 ft at 5:00AM May 30, 2023Observed: 9.57 ft at 5:30AM May 30, 2023Observed: 9.57 ft at 6:00AM May 30, 2023Observed: 9.58 ft at 6:30AM May 30, 2023Observed: 9.57 ft at 7:00AM May 30, 2023Observed: 9.61 ft at 7:30AM May 30, 2023Observed: 9.55 ft at 8:00AM May 30, 2023Observed: 9.44 ft at 8:30AM May 30, 2023Observed: 9.39 ft at 9:00AM May 30, 2023Observed: 9.36 ft at 9:30AM May 30, 2023Observed: 9.35 ft at 10:00AM May 30, 2023Observed: 9.35 ft at 10:30AM May 30, 2023Observed: 9.3 ft at 11:30AM May 30, 2023Observed: 9.33 ft at 12:00PM May 30, 2023Observed: 9.32 ft at 12:30PM May 30, 2023Observed: 9.3 ft at 1:00PM May 30, 2023Observed: 9.29 ft at 1:30PM May 30, 2023Observed: 9.32 ft at 2:00PM May 30, 2023Observed: 9.35 ft at 2:30PM May 30, 2023Observed: 9.34 ft at 3:00PM May 30, 2023Observed: 9.35 ft at 3:30PM May 30, 2023Observed: 9.37 ft at 4:00PM May 30, 2023Observed: 9.36 ft at 4:30PM May 30, 2023Observed: 9.38 ft at 5:00PM May 30, 2023Observed: 9.39 ft at 6:00PM May 30, 2023Observed: 9.41 ft at 7:00PM May 30, 2023Observed: 9.39 ft at 7:30PM May 30, 2023Observed: 9.38 ft at 8:00PM May 30, 2023Observed: 9.38 ft at 8:30PM May 30, 2023Observed: 9.39 ft at 9:30PM May 30, 2023Observed: 9.39 ft at 10:00PM May 30, 2023Observed: 9.39 ft at 10:30PM May 30, 2023Observed: 9.38 ft at 11:00PM May 30, 2023Observed: 9.39 ft at 11:30PM May 30, 2023Observed: 9.38 ft at 12:00AM May 31, 2023Observed: 9.39 ft at 12:30AM May 31, 2023Observed: 9.39 ft at 1:00AM May 31, 2023Observed: 9.39 ft at 1:30AM May 31, 2023Observed: 9.39 ft at 2:00AM May 31, 2023Observed: 9.39 ft at 2:30AM May 31, 2023Observed: 9.4 ft at 3:00AM May 31, 2023Observed: 9.4 ft at 3:30AM May 31, 2023Observed: 9.4 ft at 4:00AM May 31, 2023Observed: 9.41 ft at 4:30AM May 31, 2023Observed: 9.42 ft at 5:00AM May 31, 2023Observed: 9.42 ft at 5:30AM May 31, 2023Observed: 9.41 ft at 6:00AM May 31, 2023Observed: 9.42 ft at 6:30AM May 31, 2023Observed: 9.44 ft at 7:00AM May 31, 2023Observed: 9.42 ft at 7:30AM May 31, 2023Observed: 9.46 ft at 8:00AM May 31, 2023Observed: 9.43 ft at 8:30AM May 31, 2023Observed: 9.44 ft at 9:00AM May 31, 2023Observed: 9.41 ft at 9:30AM May 31, 2023Observed: 9.41 ft at 10:00AM May 31, 2023Observed: 9.42 ft at 10:30AM May 31, 2023Observed: 9.42 ft at 11:00AM May 31, 2023Observed: 9.42 ft at 11:30AM May 31, 2023Observed: 9.43 ft at 12:00PM May 31, 2023Observed: 9.45 ft at 12:30PM May 31, 2023Observed: 9.45 ft at 1:00PM May 31, 2023Observed: 9.45 ft at 1:30PM May 31, 2023Observed: 9.43 ft at 2:00PM May 31, 2023Observed: 9.47 ft at 2:30PM May 31, 2023Observed: 9.45 ft at 3:00PM May 31, 2023Observed: 9.42 ft at 3:30PM May 31, 2023Observed: 9.42 ft at 4:00PM May 31, 2023Observed: 9.43 ft at 4:30PM May 31, 2023Observed: 9.42 ft at 5:00PM May 31, 2023Observed: 9.43 ft at 5:30PM May 31, 2023Observed: 9.41 ft at 6:00PM May 31, 2023Observed: 9.4 ft at 6:30PM May 31, 2023Observed: 9.4 ft at 7:00PM May 31, 2023Observed: 9.39 ft at 8:30PM May 31, 2023Observed: 9.41 ft at 9:30PM May 31, 2023Observed: 9.41 ft at 10:00PM May 31, 2023Observed: 9.4 ft at 10:30PM May 31, 2023Observed: 9.38 ft at 11:00PM May 31, 2023Observed: 9.4 ft at 11:30PM May 31, 2023Observed: 9.4 ft at 12:00AM Jun 01, 2023Observed: 9.39 ft at 12:30AM Jun 01, 2023Observed: 9.39 ft at 1:00AM Jun 01, 2023Observed: 9.39 ft at 1:30AM Jun 01, 2023Observed: 9.39 ft at 2:00AM Jun 01, 2023Observed: 9.34 ft at 2:30AM Jun 01, 2023Observed: 9.34 ft at 3:00AM Jun 01, 2023Observed: 9.36 ft at 3:30AM Jun 01, 2023Observed: 9.36 ft at 4:00AM Jun 01, 2023Observed: 9.39 ft at 4:30AM Jun 01, 2023Observed: 9.42 ft at 5:00AM Jun 01, 2023Observed: 9.38 ft at 5:30AM Jun 01, 2023Observed: 9.37 ft at 6:00AM Jun 01, 2023Observed: 9.37 ft at 6:30AM Jun 01, 2023Observed: 9.37 ft at 7:00AM Jun 01, 2023Observed: 9.38 ft at 7:30AM Jun 01, 2023Observed: 9.36 ft at 8:00AM Jun 01, 2023Observed: 9.39 ft at 8:30AM Jun 01, 2023Observed: 9.4 ft at 9:00AM Jun 01, 2023Observed: 9.39 ft at 9:30AM Jun 01, 2023Observed: 9.37 ft at 10:00AM Jun 01, 2023Observed: 9.37 ft at 10:30AM Jun 01, 2023Observed: 9.38 ft at 11:30AM Jun 01, 2023Observed: 9.38 ft at 12:00PM Jun 01, 2023Observed: 9.37 ft at 12:30PM Jun 01, 2023Observed: 9.36 ft at 1:00PM Jun 01, 2023Observed: 9.45 ft at 1:30PM Jun 01, 2023Observed: 9.38 ft at 2:00PM Jun 01, 2023Observed: 9.4 ft at 2:30PM Jun 01, 2023Observed: 9.38 ft at 3:00PM Jun 01, 2023Observed: 9.38 ft at 4:30PM Jun 01, 2023Observed: 9.36 ft at 5:00PM Jun 01, 2023Observed: 9.34 ft at 5:30PM Jun 01, 2023Observed: 9.33 ft at 6:00PM Jun 01, 2023Observed: 9.34 ft at 6:30PM Jun 01, 2023Observed: 9.34 ft at 7:00PM Jun 01, 2023Observed: 9.34 ft at 7:30PM Jun 01, 2023Observed: 9.33 ft at 8:00PM Jun 01, 2023Observed: 9.34 ft at 8:30PM Jun 01, 2023Observed: 9.33 ft at 9:00PM Jun 01, 2023Observed: 9.19 ft at 9:30PM Jun 01, 2023Observed: 9.13 ft at 10:00PM Jun 01, 2023Observed: 9.07 ft at 10:30PM Jun 01, 2023Observed: 9.02 ft at 11:00PM Jun 01, 2023Observed: 9.01 ft at 11:30PM Jun 01, 2023Observed: 8.95 ft at 12:00AM Jun 02, 2023Observed: 8.93 ft at 12:30AM Jun 02, 2023Observed: 8.92 ft at 1:00AM Jun 02, 2023Observed: 8.9 ft at 1:30AM Jun 02, 2023Observed: 8.91 ft at 2:00AM Jun 02, 2023Observed: 8.89 ft at 2:30AM Jun 02, 2023Observed: 8.87 ft at 3:00AM Jun 02, 2023Highest Forecast: 9.3 ft 7:00AM Jun 02, 2023Forecast: 9.2 ft 1:00PM Jun 02, 2023Forecast: 9.2 ft 7:00PM Jun 02, 2023Forecast: 9.2 ft 1:00AM Jun 03, 2023Forecast: 9.1 ft 7:00AM Jun 03, 2023Forecast: 9.1 ft 1:00PM Jun 03, 2023Forecast: 9 ft 7:00PM Jun 03, 2023Forecast: 9 ft 1:00AM Jun 04, 2023Forecast: 9 ft 7:00AM Jun 04, 2023Forecast: 8.9 ft 1:00PM Jun 04, 2023Forecast: 8.9 ft 7:00PM Jun 04, 2023Forecast: 8.9 ft 1:00AM Jun 05, 2023Forecast: 8.8 ft 7:00AM Jun 05, 2023Forecast: 8.8 ft 1:00PM Jun 05, 2023Forecast: 8.8 ft 7:00PM Jun 05, 2023Forecast: 8.8 ft 1:00AM Jun 06, 2023Forecast: 8.7 ft 7:00AM Jun 06, 2023Forecast: 8.7 ft 1:00PM Jun 06, 2023Forecast: 8.7 ft 7:00PM Jun 06, 2023Forecast: 8.7 ft 1:00AM Jun 07, 2023Forecast: 8.6 ft 7:00AM Jun 07, 2023Forecast: 8.6 ft 1:00PM Jun 07, 2023Forecast: 8.6 ft 7:00PM Jun 07, 2023Forecast: 8.6 ft 1:00AM Jun 08, 2023Forecast: 8.5 ft 7:00AM Jun 08, 2023NLGI2(plotting HTIRG) Graph Created (4:25AM Jun 2, 2023)ObservedForecast (issued 8:21AM Jun 1)Latest observed value: 8.87 ft at 3:00 AM CDT 2-Jun-2023. Flood Stage is 23 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 LaGrange Lock and Dam 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
Low Stage (in feet): -9999

Historic Crests
(1) 34.66 ft on 07/02/2015
(2) 34.50 ft on 04/27/2013
(3) 34.02 ft on 06/01/1995
(4) 33.89 ft on 06/04/2019
(5) 33.34 ft on 05/20/2002
(6) 32.80 ft on 04/19/1979
(7) 32.00 ft on 04/29/1973
(8) 32.00 ft on 05/22/2009
(9) 32.00 ft on 07/29/1993
(10) 31.35 ft on 05/27/2020
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 24.27 ft on 07/07/2021
(2) 31.35 ft on 05/27/2020
(3) 23.62 ft on 01/24/2020
(4) 33.89 ft on 06/04/2019
(5) 24.88 ft on 04/01/2019
(6) 23.16 ft on 02/28/2019
(7) 23.93 ft on 02/17/2019
(8) 26.04 ft on 03/07/2018
(9) 29.75 ft on 05/08/2017
(10) 24.78 ft on 04/14/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 5.30 ft on 10/10/1987
(2) 5.38 ft on 10/12/2012
(3) 5.64 ft on 08/05/2012
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
429 Normal pool level.
427.5 Dam goes up at this pool level.
36 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 Extensive wetland acreage south of La Grange begins flooding.
23 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.
5.6 At and below this height, barge traffic will need to consider lowering tonnage to avoid grounding.
Photos
(1) Lockmaster's residence in the backyard on May 23, 2009 at a stage of 31.9 ft.
(2) Utility building at La Grange Lock and Dam on May 23, 2009 at a stage of 31.9 ft.
(3) Brown County Road 1965E on May 19, 2009 at a stage of 30.3 ft.
(4) Lock and Dam Road at La Grange Lock and Dam on September 26, 2008 at a stage of 29.0 ft.
(5) Illinois Conservancy wetlands south of La Grange on September 26, 2008 at a stage of 29.1 ft.
(6) Illinois Conservancy wetlands south of La Grange on September 26, 2008 at a stage of 29.1 ft.
(7) Brown County Road 500N on September 26, 2008 at a stage of 29.1 ft.
(8) Looking upstream from New La Grange Lock and Dam
(9) Looking downstream from New La Grange Lock and Dam
(10) Staff gage at the tailwater of New La Grange Lock and Dam
About This Location Collapse

Latitude: 39.939520° N, Longitude: 90.535273° W, Horizontal Datum: NAD83/WGS84

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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 413.5 ft 436.5 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:
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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
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St. Charles, MO 63304
(636) 441-8467
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