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Over 200 USGS real-time streamgages used to support NWS river forecasts and warnings are at risk of being discontinued. Click here for more information from the USGS...
Weather Forecast Office Chicago, IL North Central River Forecast Center
Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Illinois River near La Salle Stage (ft)Flow (kcfs)Observed: 15.33 ft at 2:15PM May 20, 2013Observed: 15.36 ft at 2:30PM May 20, 2013Observed: 15.36 ft at 2:45PM May 20, 2013Observed: 15.35 ft at 3:00PM May 20, 2013Observed: 15.41 ft at 3:15PM May 20, 2013Observed: 15.42 ft at 3:30PM May 20, 2013Observed: 15.41 ft at 3:45PM May 20, 2013Observed: 15.38 ft at 4:00PM May 20, 2013Observed: 15.37 ft at 4:15PM May 20, 2013Observed: 15.37 ft at 4:30PM May 20, 2013Observed: 15.37 ft at 4:45PM May 20, 2013Observed: 15.37 ft at 5:00PM May 20, 2013Observed: 15.35 ft at 5:15PM May 20, 2013Observed: 15.33 ft at 5:30PM May 20, 2013Observed: 15.35 ft at 5:45PM May 20, 2013Observed: 15.37 ft at 6:00PM May 20, 2013Observed: 15.35 ft at 6:15PM May 20, 2013Observed: 15.34 ft at 6:30PM May 20, 2013Observed: 15.34 ft at 6:45PM May 20, 2013Observed: 15.32 ft at 7:00PM May 20, 2013Observed: 15.31 ft at 7:15PM May 20, 2013Observed: 15.31 ft at 7:30PM May 20, 2013Observed: 15.32 ft at 7:45PM May 20, 2013Observed: 15.32 ft at 8:00PM May 20, 2013Observed: 15.3 ft at 8:15PM May 20, 2013Observed: 15.28 ft at 8:30PM May 20, 2013Observed: 15.25 ft at 8:45PM May 20, 2013Observed: 15.25 ft at 9:00PM May 20, 2013Observed: 15.25 ft at 9:15PM May 20, 2013Observed: 15.18 ft at 9:30PM May 20, 2013Observed: 15.17 ft at 9:45PM May 20, 2013Observed: 15.2 ft at 10:00PM May 20, 2013Observed: 15.32 ft at 10:15PM May 20, 2013Observed: 15.34 ft at 10:30PM May 20, 2013Observed: 15.33 ft at 10:45PM May 20, 2013Observed: 15.33 ft at 11:00PM May 20, 2013Observed: 15.46 ft at 11:15PM May 20, 2013Observed: 15.54 ft at 11:30PM May 20, 2013Observed: 15.51 ft at 11:45PM May 20, 2013Observed: 15.64 ft at 1:00AM May 21, 2013Observed: 15.65 ft at 1:15AM May 21, 2013Observed: 15.5 ft at 1:30AM May 21, 2013Observed: 15.49 ft at 1:45AM May 21, 2013Observed: 15.47 ft at 2:00AM May 21, 2013Observed: 15.46 ft at 2:15AM May 21, 2013Observed: 15.44 ft at 2:30AM May 21, 2013Observed: 15.33 ft at 2:45AM May 21, 2013Observed: 15.26 ft at 3:00AM May 21, 2013Observed: 15.32 ft at 3:15AM May 21, 2013Observed: 15.3 ft at 3:30AM May 21, 2013Observed: 15.27 ft at 3:45AM May 21, 2013Observed: 15.26 ft at 4:00AM May 21, 2013Observed: 15.73 ft at 4:15AM May 21, 2013Observed: 15.91 ft at 4:30AM May 21, 2013Observed: 15.93 ft at 4:45AM May 21, 2013Observed: 15.85 ft at 5:00AM May 21, 2013Observed: 15.59 ft at 5:15AM May 21, 2013Observed: 15.57 ft at 5:30AM May 21, 2013Observed: 15.64 ft at 5:45AM May 21, 2013Observed: 15.62 ft at 6:00AM May 21, 2013Observed: 15.52 ft at 6:15AM May 21, 2013Observed: 15.5 ft at 6:30AM May 21, 2013Observed: 15.5 ft at 6:45AM May 21, 2013Observed: 15.5 ft at 7:00AM May 21, 2013Observed: 15.65 ft at 7:15AM May 21, 2013Observed: 15.66 ft at 7:30AM May 21, 2013Observed: 15.68 ft at 7:45AM May 21, 2013Observed: 15.68 ft at 8:00AM May 21, 2013Observed: 15.76 ft at 8:15AM May 21, 2013Observed: 15.77 ft at 8:30AM May 21, 2013Observed: 15.76 ft at 8:45AM May 21, 2013Observed: 15.75 ft at 9:00AM May 21, 2013Observed: 15.86 ft at 9:15AM May 21, 2013Observed: 15.95 ft at 9:30AM May 21, 2013Observed: 15.95 ft at 9:45AM May 21, 2013Observed: 15.95 ft at 10:00AM May 21, 2013Observed: 15.95 ft at 10:15AM May 21, 2013Observed: 15.96 ft at 10:30AM May 21, 2013Observed: 15.96 ft at 10:45AM May 21, 2013Observed: 15.99 ft at 11:00AM May 21, 2013Observed: 16.01 ft at 11:15AM May 21, 2013Observed: 16.02 ft at 11:30AM May 21, 2013Observed: 16.02 ft at 11:45AM May 21, 2013Observed: 16.02 ft at 12:00PM May 21, 2013Observed: 16.16 ft at 12:15PM May 21, 2013Observed: 16.23 ft at 12:30PM May 21, 2013Observed: 16.24 ft at 12:45PM May 21, 2013Observed: 16.34 ft at 1:00PM May 21, 2013Observed: 16.42 ft at 1:15PM May 21, 2013Observed: 16.45 ft at 1:30PM May 21, 2013Observed: 16.52 ft at 1:45PM May 21, 2013Observed: 16.53 ft at 2:00PM May 21, 2013Observed: 16.56 ft at 2:15PM May 21, 2013Observed: 16.56 ft at 2:30PM May 21, 2013Observed: 16.47 ft at 2:45PM May 21, 2013Observed: 16.45 ft at 3:00PM May 21, 2013Observed: 16.46 ft at 3:15PM May 21, 2013Observed: 16.24 ft at 3:30PM May 21, 2013Observed: 16.15 ft at 3:45PM May 21, 2013Observed: 16.15 ft at 4:00PM May 21, 2013Observed: 16.12 ft at 4:15PM May 21, 2013Observed: 16.08 ft at 4:30PM May 21, 2013Observed: 16.06 ft at 4:45PM May 21, 2013Observed: 16.06 ft at 5:00PM May 21, 2013Observed: 16.04 ft at 5:15PM May 21, 2013Observed: 16.02 ft at 5:30PM May 21, 2013Observed: 16 ft at 5:45PM May 21, 2013Observed: 15.98 ft at 6:00PM May 21, 2013Observed: 15.97 ft at 6:15PM May 21, 2013Observed: 15.96 ft at 6:30PM May 21, 2013Observed: 15.94 ft at 6:45PM May 21, 2013Observed: 15.93 ft at 7:00PM May 21, 2013Observed: 15.93 ft at 7:15PM May 21, 2013Observed: 16.02 ft at 7:30PM May 21, 2013Observed: 16.02 ft at 7:45PM May 21, 2013Observed: 16.03 ft at 8:00PM May 21, 2013Observed: 16.05 ft at 8:15PM May 21, 2013Observed: 16.07 ft at 8:30PM May 21, 2013Observed: 16.08 ft at 8:45PM May 21, 2013Observed: 16.09 ft at 9:00PM May 21, 2013Observed: 16.08 ft at 9:15PM May 21, 2013Observed: 16.08 ft at 9:30PM May 21, 2013Observed: 15.91 ft at 9:45PM May 21, 2013Observed: 15.88 ft at 10:00PM May 21, 2013Observed: 15.87 ft at 10:15PM May 21, 2013Observed: 15.85 ft at 10:30PM May 21, 2013Observed: 15.83 ft at 10:45PM May 21, 2013Observed: 15.81 ft at 11:00PM May 21, 2013Observed: 15.79 ft at 11:15PM May 21, 2013Observed: 15.77 ft at 11:30PM May 21, 2013Observed: 15.76 ft at 11:45PM May 21, 2013Observed: 15.69 ft at 12:00AM May 22, 2013Observed: 15.71 ft at 12:15AM May 22, 2013Observed: 15.71 ft at 12:30AM May 22, 2013Observed: 15.69 ft at 12:45AM May 22, 2013Observed: 15.67 ft at 1:00AM May 22, 2013Observed: 15.68 ft at 1:15AM May 22, 2013Observed: 15.67 ft at 1:30AM May 22, 2013Observed: 15.79 ft at 1:45AM May 22, 2013Observed: 15.8 ft at 2:00AM May 22, 2013Observed: 15.81 ft at 2:15AM May 22, 2013Observed: 15.82 ft at 2:30AM May 22, 2013Observed: 15.85 ft at 2:45AM May 22, 2013Observed: 15.86 ft at 3:00AM May 22, 2013Observed: 15.88 ft at 3:15AM May 22, 2013Observed: 15.89 ft at 3:30AM May 22, 2013Observed: 15.92 ft at 3:45AM May 22, 2013Observed: 15.92 ft at 4:00AM May 22, 2013Observed: 15.91 ft at 4:15AM May 22, 2013Observed: 15.91 ft at 4:30AM May 22, 2013Observed: 15.91 ft at 4:45AM May 22, 2013Observed: 15.92 ft at 5:00AM May 22, 2013Observed: 15.92 ft at 5:15AM May 22, 2013Observed: 15.93 ft at 5:30AM May 22, 2013Observed: 15.93 ft at 5:45AM May 22, 2013Observed: 15.94 ft at 6:00AM May 22, 2013Observed: 15.95 ft at 6:15AM May 22, 2013Observed: 15.95 ft at 6:30AM May 22, 2013Observed: 15.96 ft at 6:45AM May 22, 2013Observed: 15.96 ft at 7:00AM May 22, 2013Observed: 15.95 ft at 7:15AM May 22, 2013Observed: 15.95 ft at 7:30AM May 22, 2013Observed: 15.98 ft at 7:45AM May 22, 2013Observed: 15.99 ft at 8:00AM May 22, 2013Observed: 15.98 ft at 8:15AM May 22, 2013Observed: 15.96 ft at 8:30AM May 22, 2013Observed: 15.94 ft at 8:45AM May 22, 2013Observed: 15.96 ft at 9:00AM May 22, 2013Observed: 16.09 ft at 9:15AM May 22, 2013Observed: 16.09 ft at 9:30AM May 22, 2013Observed: 16.1 ft at 9:45AM May 22, 2013Observed: 16.12 ft at 10:00AM May 22, 2013Observed: 16.15 ft at 10:15AM May 22, 2013Observed: 16.18 ft at 10:30AM May 22, 2013Observed: 16.2 ft at 10:45AM May 22, 2013Observed: 16.22 ft at 11:00AM May 22, 2013Observed: 16.23 ft at 11:15AM May 22, 2013Observed: 16.23 ft at 11:30AM May 22, 2013Observed: 16.25 ft at 11:45AM May 22, 2013Observed: 16.26 ft at 12:00PM May 22, 2013Observed: 16.25 ft at 12:15PM May 22, 2013Observed: 16.25 ft at 12:30PM May 22, 2013Observed: 16.25 ft at 12:45PM May 22, 2013Observed: 16.25 ft at 1:00PM May 22, 2013Observed: 16.26 ft at 1:15PM May 22, 2013Observed: 16.27 ft at 1:30PM May 22, 2013Observed: 16.28 ft at 1:45PM May 22, 2013Observed: 16.28 ft at 2:00PM May 22, 2013Observed: 16.51 ft at 2:15PM May 22, 2013Observed: 16.52 ft at 2:30PM May 22, 2013Observed: 16.56 ft at 2:45PM May 22, 2013Observed: 16.65 ft at 3:00PM May 22, 2013Observed: 16.74 ft at 3:15PM May 22, 2013Observed: 16.75 ft at 3:30PM May 22, 2013Observed: 16.76 ft at 3:45PM May 22, 2013Observed: 16.78 ft at 4:00PM May 22, 2013Observed: 16.82 ft at 4:15PM May 22, 2013Observed: 16.85 ft at 4:30PM May 22, 2013Observed: 16.87 ft at 4:45PM May 22, 2013Observed: 16.89 ft at 5:00PM May 22, 2013Observed: 16.91 ft at 5:15PM May 22, 2013Observed: 16.93 ft at 5:30PM May 22, 2013Observed: 16.91 ft at 5:45PM May 22, 2013Observed: 17 ft at 6:00PM May 22, 2013Observed: 16.99 ft at 6:15PM May 22, 2013Observed: 16.91 ft at 6:30PM May 22, 2013Observed: 16.82 ft at 6:45PM May 22, 2013Observed: 16.83 ft at 7:00PM May 22, 2013Observed: 16.84 ft at 7:15PM May 22, 2013Observed: 16.84 ft at 7:30PM May 22, 2013Observed: 16.82 ft at 7:45PM May 22, 2013Observed: 16.8 ft at 8:00PM May 22, 2013Observed: 16.79 ft at 8:15PM May 22, 2013Observed: 16.78 ft at 8:30PM May 22, 2013Observed: 16.78 ft at 8:45PM May 22, 2013Observed: 16.78 ft at 9:00PM May 22, 2013Observed: 16.78 ft at 9:15PM May 22, 2013Observed: 16.77 ft at 9:30PM May 22, 2013Observed: 16.85 ft at 9:45PM May 22, 2013Observed: 16.85 ft at 10:00PM May 22, 2013Observed: 16.87 ft at 10:15PM May 22, 2013Observed: 16.88 ft at 10:30PM May 22, 2013Observed: 16.89 ft at 10:45PM May 22, 2013Observed: 16.98 ft at 11:00PM May 22, 2013Observed: 17 ft at 11:15PM May 22, 2013Observed: 17.02 ft at 11:30PM May 22, 2013Observed: 17.05 ft at 11:45PM May 22, 2013Observed: 17.12 ft at 12:00AM May 23, 2013Observed: 17.12 ft at 12:15AM May 23, 2013Observed: 17.13 ft at 12:30AM May 23, 2013Observed: 17.14 ft at 12:45AM May 23, 2013Observed: 17.15 ft at 1:00AM May 23, 2013Observed: 17.13 ft at 1:15AM May 23, 2013Observed: 17.11 ft at 1:30AM May 23, 2013Observed: 17.1 ft at 1:45AM May 23, 2013Observed: 17.09 ft at 2:00AM May 23, 2013Observed: 17.1 ft at 2:15AM May 23, 2013Observed: 17.1 ft at 2:30AM May 23, 2013Observed: 17.1 ft at 2:45AM May 23, 2013Observed: 17.11 ft at 3:00AM May 23, 2013Observed: 17.1 ft at 3:15AM May 23, 2013Observed: 17.08 ft at 3:30AM May 23, 2013Observed: 17.06 ft at 3:45AM May 23, 2013Observed: 17.07 ft at 4:00AM May 23, 2013Observed: 17.08 ft at 4:15AM May 23, 2013Observed: 17.07 ft at 4:30AM May 23, 2013Observed: 17.06 ft at 4:45AM May 23, 2013Observed: 17.06 ft at 5:00AM May 23, 2013Observed: 17.06 ft at 5:15AM May 23, 2013Observed: 17.06 ft at 5:30AM May 23, 2013Observed: 17.05 ft at 5:45AM May 23, 2013Observed: 17.06 ft at 6:00AM May 23, 2013Observed: 17.06 ft at 6:15AM May 23, 2013Observed: 17.06 ft at 6:30AM May 23, 2013Observed: 17.07 ft at 6:45AM May 23, 2013Observed: 17.08 ft at 7:00AM May 23, 2013Observed: 17.07 ft at 7:15AM May 23, 2013Observed: 17.07 ft at 7:30AM May 23, 2013Observed: 17.08 ft at 7:45AM May 23, 2013Observed: 17.09 ft at 8:00AM May 23, 2013Observed: 17.08 ft at 8:15AM May 23, 2013Observed: 17.07 ft at 8:30AM May 23, 2013Observed: 17.14 ft at 8:45AM May 23, 2013Observed: 17.13 ft at 9:00AM May 23, 2013Observed: 17.14 ft at 9:15AM May 23, 2013Observed: 17.15 ft at 9:30AM May 23, 2013Observed: 17.15 ft at 9:45AM May 23, 2013Observed: 17.16 ft at 10:00AM May 23, 2013Observed: 17.17 ft at 10:15AM May 23, 2013Observed: 17.17 ft at 10:30AM May 23, 2013Observed: 17.18 ft at 10:45AM May 23, 2013Observed: 17.2 ft at 11:00AM May 23, 2013Observed: 17.2 ft at 11:15AM May 23, 2013Observed: 17.2 ft at 11:30AM May 23, 2013Observed: 17.22 ft at 11:45AM May 23, 2013Observed: 17.23 ft at 12:00PM May 23, 2013Observed: 17.23 ft at 12:15PM May 23, 2013Observed: 17.23 ft at 12:30PM May 23, 2013Highest Observation: 17.24 ft at 12:45PM May 23, 2013Forecast: 17.3 ft 7:00PM May 23, 2013Highest Forecast: 17.4 ft 1:00AM May 24, 2013Forecast: 17.3 ft 7:00AM May 24, 2013Forecast: 17.2 ft 1:00PM May 24, 2013Forecast: 16.9 ft 7:00PM May 24, 2013Forecast: 16.5 ft 1:00AM May 25, 2013Forecast: 16.3 ft 7:00AM May 25, 2013Forecast: 16 ft 1:00PM May 25, 2013Forecast: 15.7 ft 7:00PM May 25, 2013Forecast: 15.5 ft 1:00AM May 26, 2013Forecast: 15.2 ft 7:00AM May 26, 2013Forecast: 15 ft 1:00PM May 26, 2013Forecast: 14.7 ft 7:00PM May 26, 2013Forecast: 14.6 ft 1:00AM May 27, 2013Forecast: 14.4 ft 7:00AM May 27, 2013Forecast: 14.3 ft 1:00PM May 27, 2013Forecast: 14.1 ft 7:00PM May 27, 2013Forecast: 14 ft 1:00AM May 28, 2013Forecast: 13.8 ft 7:00AM May 28, 2013Forecast: 13.7 ft 1:00PM May 28, 2013Forecast: 13.5 ft 7:00PM May 28, 2013Forecast: 13.4 ft 1:00AM May 29, 2013Forecast: 13.3 ft 7:00AM May 29, 2013Forecast: 13.1 ft 1:00PM May 29, 2013Forecast: 13 ft 7:00PM May 29, 2013Forecast: 13 ft 1:00AM May 30, 2013Forecast: 12.9 ft 7:00AM May 30, 2013LSLI2(plotting HGIRG) Graph Created (2:04PM May 23, 2013)ObservedForecast (issued 10:47AM May 23)Latest observed value: 17.24 ft at 12:45 PM CDT 23-May-2013. Flood Stage is 20 ft
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Tabular Data
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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 Illinois River near La Salle are issued routinely year-round.

Return to Area Map
Upstream Gauge - at Starved Rock lock/dam Upstream Gauge Downstream Gauge Downstream Gauge - at Henry
Flood Categories (in feet)
Major Flood Stage:31
Moderate Flood Stage:27
Flood Stage:20
Action Stage:19

Historical Crests
(1) 33.79 ft on 09/16/2008
(2) 32.05 ft on 12/05/1982
(3) 32.02 ft on 03/12/2009
(4) 31.75 ft on 03/21/1979
(5) 31.70 ft on 03/06/1985
Show More Historical Crests

Low Water Records
Currently none available.
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
33 The business district in La Salle floods.
31 Some flood damage begins in Ottawa.
30 Water reaches the top of the La Salle water pumping station pit.
29 Flooding begins in sections of Peru.
27.5 Hennepin Levee is overtopped at road crossing.
27 Some flooding begins to low lying residences in Ottawa.
22 Riverside parking lot at Starved Rock State park floods.
21 low lying agricultural areas from 6 miles upstream to 12 miles downstream are flooded.
20 agricultural areas in La Salle, Spring Valley, and Peru lowlands are flooded.
17.5 some flooding of agricultural land begins.
About This Location Collapse

Latitude: 41.323611° N, Longitude: 89.110833° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 20 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 29 430 ft 450 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Other Data Sources:
Additional Information Collapse
How much forecast precipitation was used for the current river forecast?
How low could the river get?
Resources Collapse
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
Chicago Weather Forecast Office
333 W. University Dr.
Romeoville, IL 60446
(815) 834-1435
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Page last modified: 13-Mar-2013 6:33 PM 		Disclaimer
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