National Weather Service Advanced Hydrologic Prediction Service

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This probabilistic forecast is issued by the North Central River Forecast Center.

	Hydrograph			River at a Glance			Download			Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

About this graph

Forecasts for the Mazon River near Coal City are issued as needed during times of high water, but are not routinely available.

Return to Area Map

Downstream Gauge

Zoom Level:15

Flood Categories (in feet)

Major Flood Stage:	19
Moderate Flood Stage:	16
Flood Stage:	12
Action Stage:	10
Low Stage (in feet):	0.5

Historic Crests
(1) 21.00 ft on 08/08/1924 (P)
(2) 19.70 ft on 07/15/1958
(3) 19.51 ft on 12/04/1982
(4) 18.83 ft on 11/28/1990
(5) 18.54 ft on 09/15/2008
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 10.81 ft on 06/28/2021
(2) 17.88 ft on 05/18/2020
(3) 13.04 ft on 04/30/2020
(4) 16.41 ft on 05/01/2019
(5) 12.87 ft on 02/21/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.20 ft on 10/01/2000
(2) 0.51 ft on 08/01/2011
(3) 0.60 ft on 10/01/1990
(4) 0.62 ft on 08/06/2012
(5) 0.74 ft on 10/14/2020
Show More Low Water Records

	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
24	Residential structures may be threatened along Forest Drive and West Avenue west of Coal City.
22	Structures may be threatened along Spring Road west of Coal City. Whitetie Road may be threatened west of Coal City.
20	IL-113, Pine Bluff Road, and McArdle Road may be threatened west of Coal City. Reed Road may be threatened southwest of Coal City.
18	Spring Road may be threatened west of Coal City.
16	Gorman Road and Grand Ridge Road may be threatened southwest of Coal City. Widespread inundation of agricultural land occurs.
15	Water may begin to overflow into nearby lakes along the river.
12	Low-lying agricultural land is inundated west of Coal City.
10	Low-lying agricultural land is inundated northwest of Coal City near the Illinois River.
8	Water overtops low-lying banks along the river west of Coal City.
Photos (1) Gage house (2) Looking downstream from bridge. Stage 1.33 ft. (3) Looking upstream from bridge. Stage 1.33 ft.

Low Water Impacts

If you notice any errors in the below information, please contact our Webmaster

0.5	River nears zero flow.

Other Real-time and/or Archive Data Sources:

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

Additional Information

How much forecast precipitation was used for the current river forecast?
USGS Streamflow Duration Hydrograph
How low could the river get?

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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