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Local weather forecast by
What is AHPS?
Weather Forecast Office Chicago, IL
North Central River Forecast Center
River at a Glance
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About this graph
Tabular Data (UTC)
Tabular Data (CST)
Graphical forecasts are not available for the Mainstream Deep Tunnel at McCook Reservoir.
During times of high water, forecast crest information can be found in the
Scale to Flood Categories
Return to Area Map
Flood Categories (in feet)
(1) -35.00 ft on 05/06/2019
(2) -38.90 ft on 05/21/2020
: Preliminary values subject to further review.
Currently none available.
Low Water Records
Currently none available.
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
McCook Reservoir reaches 100 percent of full storage. Combined sewer overflow event likely.
McCook Reservoir reaches 75 percent of full storage. Combined sewer overflow event possible.
McCook Reservoir reaches 50 percent of full storage.
McCook Reservoir reaches 25 percent of full storage.
McCook Reservoir is empty, 0 percent of full storage.
About This Location
Latitude: 41.777500° N, Longitude: 87.836600° W, Horizontal Datum: NAD83/WGS84
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
Older USGS topographic maps, NGVD29 benchmarks
Older USGS topographic maps, MSL benchmarks
Chicago City Datum
McCook Reservoir Webcam
TARP Reservoir Storage Levels
River Forecast Centers
River Stage Summary
USGS WaterAlert Gauge Notifications
Snow Cover Information
NWS Chicago Hydrology Program
Hydrology of North Illinois and Northwest Indiana
NWS Precipitation and River Forecasting
AHPS Iframes for Developers
Mobile iNWS for emergency management
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
National Weather Service
Chicago Weather Forecast Office
333 W. University Dr.
Romeoville, IL 60446
Page last modified: 2-Nov-2020 7:29 PM