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This probabilistic forecast is issued by the North Central River Forecast Center.
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About this graph
Forecasts for the Illinois River near La Salle are issued routinely year-round.
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Upstream Gauge - at Starved Rock Lock (tailwater) Upstream Gauge Downstream Gauge Downstream Gauge - near Henry
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 31
Moderate Flood Stage: 27
Flood Stage: 20
Action Stage: 19
Low Stage (in feet): 8.7

Historic Crests
(1) 34.44 ft on 04/20/2013
(2) 33.79 ft on 09/16/2008
(3) 33.14 ft on 05/20/2020
(4) 32.14 ft on 05/03/2019
(5) 32.05 ft on 12/05/1982
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(P): Preliminary values subject to further review.

Recent Crests
(1) 33.14 ft on 05/20/2020
(2) 26.54 ft on 05/01/2020
(3) 23.69 ft on 01/13/2020
(4) 24.56 ft on 11/01/2019
(5) 26.77 ft on 09/30/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.80 ft on 08/28/1868
(2) 10.02 ft on 12/14/2010
(3) 10.05 ft on 02/03/2011
(4) 10.07 ft on 09/27/2012
(5) 10.14 ft on 01/06/2014
Show More Low Water Records
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Gauge LocationGauge Map Marker
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
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34.5 North Utica Village Hall, police department, and wastewater treatment plant property are threatened.
33 A couple structures are threatened near the river in downtown La Salle.
32 Numerous industrial and utility properties are threatened along Water Street near downtown LaSalle. A few residences threatened in North Utica. IL-178 (Clark Street) threatened in North Utica.
31 A couple structures threatened in North Utica.
30 La Salle water pumping station property is threatened.
28.5 Water Street is threatened in Peru.
28 Dee Bennet Road is threatened between Ottawa and Utica.
22 Lower parking lot at Starved Rock State Park is inundated east of La Salle. High water levels begin to impact shipping interests along the river.
20 Agricultural areas in La Salle, Spring Valley, and Peru are inundated.
17.5 Low-lying agricultural land near the river is inundated.
Low Water Impacts Collapse
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8.7 Low water levels begin to impact shipping interests along the river.

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
How much forecast precipitation was used for the current river forecast?
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
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333 W. University Dr.
Romeoville, IL 60446
(815) 834-1435
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Page last modified: 30-Oct-2020 4:09 PM
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