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Hydrograph River at a Glance Download
Illinois River at LaGrange Lock and Dam Tailwater (ft)Observed: 16.2 ft at 4:00AM Jun 22, 2017Observed: 16.22 ft at 6:00AM Jun 22, 2017Observed: 16.21 ft at 8:00AM Jun 22, 2017Observed: 16.25 ft at 10:00AM Jun 22, 2017Observed: 16.29 ft at 12:00PM Jun 22, 2017Observed: 16.3 ft at 2:00PM Jun 22, 2017Observed: 16.31 ft at 4:00PM Jun 22, 2017Observed: 16.3 ft at 6:00PM Jun 22, 2017Observed: 16.36 ft at 8:00PM Jun 22, 2017Observed: 16.34 ft at 10:00PM Jun 22, 2017Observed: 16.37 ft at 12:00AM Jun 23, 2017Highest Observation: 16.4 ft at 2:00AM Jun 23, 2017Observed: 16.32 ft at 4:00AM Jun 23, 2017Observed: 16.28 ft at 6:00AM Jun 23, 2017Observed: 16.34 ft at 8:00AM Jun 23, 2017Observed: 16.34 ft at 10:00AM Jun 23, 2017Observed: 16.29 ft at 12:00PM Jun 23, 2017Observed: 16.3 ft at 2:00PM Jun 23, 2017Observed: 16.3 ft at 4:00PM Jun 23, 2017Observed: 16.32 ft at 6:00PM Jun 23, 2017Observed: 16.32 ft at 8:00PM Jun 23, 2017Observed: 16.33 ft at 10:00PM Jun 23, 2017Observed: 16.32 ft at 12:00AM Jun 24, 2017Observed: 16.32 ft at 2:00AM Jun 24, 2017Observed: 16.35 ft at 4:00AM Jun 24, 2017Observed: 16.3 ft at 6:00AM Jun 24, 2017Observed: 16.28 ft at 8:00AM Jun 24, 2017Observed: 16.29 ft at 10:00AM Jun 24, 2017Observed: 16.28 ft at 12:00PM Jun 24, 2017Observed: 16.29 ft at 2:00PM Jun 24, 2017Observed: 16.28 ft at 4:00PM Jun 24, 2017Observed: 16.36 ft at 6:00PM Jun 24, 2017Observed: 16.29 ft at 8:00PM Jun 24, 2017Observed: 16.28 ft at 10:00PM Jun 24, 2017Observed: 16.26 ft at 12:00AM Jun 25, 2017Observed: 16.26 ft at 2:00AM Jun 25, 2017Observed: 16.29 ft at 4:00AM Jun 25, 2017Observed: 16.32 ft at 6:00AM Jun 25, 2017Observed: 16.31 ft at 8:00AM Jun 25, 2017Observed: 16.29 ft at 10:00AM Jun 25, 2017Observed: 16.29 ft at 12:00PM Jun 25, 2017Observed: 16.26 ft at 2:00PM Jun 25, 2017Observed: 16.28 ft at 4:00PM Jun 25, 2017Observed: 16.24 ft at 6:00PM Jun 25, 2017Observed: 16.24 ft at 8:00PM Jun 25, 2017Observed: 16.28 ft at 10:00PM Jun 25, 2017Observed: 16.28 ft at 12:00AM Jun 26, 2017Observed: 16.3 ft at 2:00AM Jun 26, 2017Observed: 16.29 ft at 4:00AM Jun 26, 2017Observed: 16.29 ft at 6:00AM Jun 26, 2017Observed: 16.3 ft at 8:00AM Jun 26, 2017Observed: 16.25 ft at 10:00AM Jun 26, 2017Observed: 16.24 ft at 12:00PM Jun 26, 2017Observed: 16.24 ft at 2:00PM Jun 26, 2017Observed: 16.24 ft at 4:00PM Jun 26, 2017Observed: 16.26 ft at 6:00PM Jun 26, 2017Observed: 16.24 ft at 8:00PM Jun 26, 2017Observed: 16.22 ft at 10:00PM Jun 26, 2017Observed: 16.27 ft at 12:00AM Jun 27, 2017Highest Forecast: 16.2 ft 7:00AM Jun 27, 2017Highest Forecast: 16.2 ft 1:00PM Jun 27, 2017Forecast: 16.1 ft 7:00PM Jun 27, 2017Forecast: 16.1 ft 1:00AM Jun 28, 2017Forecast: 16.1 ft 7:00AM Jun 28, 2017Forecast: 16 ft 1:00PM Jun 28, 2017Forecast: 16 ft 7:00PM Jun 28, 2017Forecast: 15.9 ft 1:00AM Jun 29, 2017Forecast: 15.9 ft 7:00AM Jun 29, 2017Forecast: 15.8 ft 1:00PM Jun 29, 2017Forecast: 15.7 ft 7:00PM Jun 29, 2017Forecast: 15.6 ft 1:00AM Jun 30, 2017Forecast: 15.5 ft 7:00AM Jun 30, 2017Forecast: 15.4 ft 1:00PM Jun 30, 2017Forecast: 15.3 ft 7:00PM Jun 30, 2017Forecast: 15.2 ft 1:00AM Jul 01, 2017Forecast: 15.1 ft 7:00AM Jul 01, 2017Forecast: 15 ft 1:00PM Jul 01, 2017Forecast: 14.9 ft 7:00PM Jul 01, 2017Forecast: 14.8 ft 1:00AM Jul 02, 2017Forecast: 14.7 ft 7:00AM Jul 02, 2017Forecast: 14.6 ft 1:00PM Jul 02, 2017Forecast: 14.5 ft 7:00PM Jul 02, 2017Forecast: 14.4 ft 1:00AM Jul 03, 2017Forecast: 14.3 ft 7:00AM Jul 03, 2017NLGI2(plotting HTIRZ) Graph Created (3:38AM Jun 27, 2017)ObservedForecast (issued 10:44AM Jun 26)Latest observed value: 16.27 ft at 12:00 AM CDT 27-Jun-2017. 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) 33.34 ft on 05/20/2002
(5) 32.80 ft on 04/19/1979 (P)
(6) 32.00 ft on 04/29/1973
(7) 32.00 ft on 05/22/2009
(8) 32.00 ft on 07/29/1993
(9) 31.15 ft on 06/06/2013
(10) 30.42 ft on 06/29/2010
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 29.75 ft on 05/08/2017
(2) 24.78 ft on 04/14/2017
(3) 34.66 ft on 07/02/2015
(4) 31.15 ft on 06/06/2013
(5) 34.50 ft on 04/27/2013
(6) 27.86 ft on 06/28/2011
(7) 27.47 ft on 05/04/2011
(8) 30.42 ft on 06/29/2010
(9) 25.39 ft on 05/23/2010
(10) 24.83 ft on 03/22/2010
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
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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: 39.940278° N, Longitude: 90.534444° 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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Page last modified: 21-Dec-2016 5:20 PM
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