National Weather Service Advanced Hydrologic Prediction Service

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Weather Forecast Office Chicago, IL

North Central River Forecast Center

Hydrograph

River at a Glance

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Chicago Sanitary and Ship Canal at Lemont

Printable Image

About this graph

Tabular Data (UTC)

Tabular Data (CDT)

Datum: NAVD88

Metadata

NOTE: Graphical forecasts are not available for the Chicago Sanitary and Ship Canal at Lemont. During times of high water, forecast crest information can be found in the text products.

Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in KCFS)

Major Flood Flow:	0
Moderate Flood Flow:	0
Flood Flow:	0
Action Flow:	7
Low Stage (in feet):	-9999

Historic Crests
(1) 21,700 cfs on 05/18/2020
(2) 21,400 cfs on 04/18/2013
(3) 20,053 cfs on 09/14/2008
(4) 18,971 cfs on 07/24/2010
(5) 18,649 cfs on 12/27/2008
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21,700 cfs on 05/18/2020
(2) 17,100 cfs on 05/01/2019
(3) 17,000 cfs on 02/21/2018
(4) 18,500 cfs on 10/15/2017
(5) 16,500 cfs on 03/30/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:14

	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

If you notice any errors in the below information, please contact our Webmaster
10000	High streamflows begin to cause closures of portions of the Chicago Sanitary and Ship Canal.
7000	High streamflows begin to impact shipping interests along the river.

About This Location

Latitude: 41.691170° N, Longitude: 87.963780° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS flow	Not Available	Not Available	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	551.76	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	Not Available	Not Available	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:

U.S. Geological Survey (USGS) Data and Site Info for Lemont

Resources

Hydrologic Resources

Additional Resources

Collaborative Agencies

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: 2-Nov-2020 7:29 PM

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