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Hydrograph River at a Glance Download
Calumet Union Drainage Canal at Markham Stage (ft)Observed: 3.08 ft at 10:00PM Oct 13, 2021Observed: 3.04 ft at 10:15PM Oct 13, 2021Observed: 3 ft at 10:30PM Oct 13, 2021Observed: 2.96 ft at 10:45PM Oct 13, 2021Observed: 2.92 ft at 11:00PM Oct 13, 2021Observed: 2.89 ft at 11:15PM Oct 13, 2021Observed: 2.87 ft at 11:30PM Oct 13, 2021Observed: 2.84 ft at 11:45PM Oct 13, 2021Observed: 2.82 ft at 12:00AM Oct 14, 2021Observed: 2.8 ft at 12:15AM Oct 14, 2021Observed: 2.78 ft at 12:30AM Oct 14, 2021Observed: 2.76 ft at 12:45AM Oct 14, 2021Observed: 2.74 ft at 1:00AM Oct 14, 2021Observed: 2.73 ft at 1:15AM Oct 14, 2021Observed: 2.71 ft at 1:30AM Oct 14, 2021Observed: 2.7 ft at 1:45AM Oct 14, 2021Observed: 2.69 ft at 2:00AM Oct 14, 2021Observed: 2.68 ft at 2:15AM Oct 14, 2021Observed: 2.66 ft at 2:30AM Oct 14, 2021Observed: 2.65 ft at 2:45AM Oct 14, 2021Observed: 2.64 ft at 3:00AM Oct 14, 2021Observed: 2.63 ft at 3:15AM Oct 14, 2021Observed: 2.62 ft at 3:30AM Oct 14, 2021Observed: 2.61 ft at 3:45AM Oct 14, 2021Observed: 2.6 ft at 4:00AM Oct 14, 2021Observed: 2.59 ft at 4:15AM Oct 14, 2021Observed: 2.58 ft at 4:30AM Oct 14, 2021Observed: 2.58 ft at 4:45AM Oct 14, 2021Observed: 2.59 ft at 5:00AM Oct 14, 2021Observed: 2.64 ft at 5:15AM Oct 14, 2021Observed: 2.71 ft at 5:30AM Oct 14, 2021Observed: 2.77 ft at 5:45AM Oct 14, 2021Observed: 2.82 ft at 6:00AM Oct 14, 2021Observed: 2.85 ft at 6:15AM Oct 14, 2021Observed: 2.88 ft at 6:30AM Oct 14, 2021Observed: 2.91 ft at 6:45AM Oct 14, 2021Observed: 2.93 ft at 7:00AM Oct 14, 2021Observed: 2.95 ft at 7:15AM Oct 14, 2021Observed: 3 ft at 7:30AM Oct 14, 2021Observed: 3.07 ft at 7:45AM Oct 14, 2021Observed: 3.15 ft at 8:00AM Oct 14, 2021Observed: 3.23 ft at 8:15AM Oct 14, 2021Observed: 3.28 ft at 8:30AM Oct 14, 2021Observed: 3.31 ft at 8:45AM Oct 14, 2021Highest Observation: 3.32 ft at 9:00AM Oct 14, 2021Highest Observation: 3.32 ft at 9:15AM Oct 14, 2021Observed: 3.31 ft at 9:30AM Oct 14, 2021Observed: 3.29 ft at 9:45AM Oct 14, 2021Observed: 3.27 ft at 10:00AM Oct 14, 2021Observed: 3.25 ft at 10:15AM Oct 14, 2021Observed: 3.23 ft at 10:30AM Oct 14, 2021Observed: 3.2 ft at 10:45AM Oct 14, 2021Observed: 3.18 ft at 11:00AM Oct 14, 2021Observed: 3.15 ft at 11:15AM Oct 14, 2021Observed: 3.12 ft at 11:30AM Oct 14, 2021Observed: 3.09 ft at 11:45AM Oct 14, 2021Observed: 3.06 ft at 12:00PM Oct 14, 2021Observed: 3.03 ft at 12:15PM Oct 14, 2021Observed: 3 ft at 12:30PM Oct 14, 2021Observed: 2.98 ft at 12:45PM Oct 14, 2021Observed: 2.95 ft at 1:00PM Oct 14, 2021Observed: 2.93 ft at 1:15PM Oct 14, 2021Observed: 2.9 ft at 1:30PM Oct 14, 2021Observed: 2.88 ft at 1:45PM Oct 14, 2021Observed: 2.86 ft at 2:00PM Oct 14, 2021Observed: 2.84 ft at 2:15PM Oct 14, 2021Observed: 2.82 ft at 2:30PM Oct 14, 2021Observed: 2.8 ft at 2:45PM Oct 14, 2021Observed: 2.79 ft at 3:00PM Oct 14, 2021Observed: 2.77 ft at 3:15PM Oct 14, 2021Observed: 2.76 ft at 3:30PM Oct 14, 2021Observed: 2.74 ft at 3:45PM Oct 14, 2021Observed: 2.73 ft at 4:00PM Oct 14, 2021Observed: 2.72 ft at 4:15PM Oct 14, 2021Observed: 2.71 ft at 4:30PM Oct 14, 2021Observed: 2.69 ft at 4:45PM Oct 14, 2021Observed: 2.68 ft at 5:00PM Oct 14, 2021Observed: 2.67 ft at 5:15PM Oct 14, 2021Observed: 2.66 ft at 5:30PM Oct 14, 2021Observed: 2.65 ft at 5:45PM Oct 14, 2021Observed: 2.64 ft at 6:00PM Oct 14, 2021Observed: 2.63 ft at 6:15PM Oct 14, 2021Observed: 2.62 ft at 6:30PM Oct 14, 2021Observed: 2.61 ft at 6:45PM Oct 14, 2021Observed: 2.61 ft at 7:00PM Oct 14, 2021Observed: 2.6 ft at 7:15PM Oct 14, 2021Observed: 2.59 ft at 7:30PM Oct 14, 2021Observed: 2.58 ft at 7:45PM Oct 14, 2021Observed: 2.58 ft at 8:00PM Oct 14, 2021Observed: 2.57 ft at 8:15PM Oct 14, 2021Observed: 2.56 ft at 8:30PM Oct 14, 2021Observed: 2.56 ft at 8:45PM Oct 14, 2021Observed: 2.55 ft at 9:00PM Oct 14, 2021Observed: 2.55 ft at 9:15PM Oct 14, 2021Observed: 2.54 ft at 9:30PM Oct 14, 2021Observed: 2.53 ft at 9:45PM Oct 14, 2021Observed: 2.53 ft at 10:00PM Oct 14, 2021Observed: 2.52 ft at 10:15PM Oct 14, 2021Observed: 2.52 ft at 10:30PM Oct 14, 2021Observed: 2.51 ft at 10:45PM Oct 14, 2021Observed: 2.5 ft at 11:00PM Oct 14, 2021Observed: 2.5 ft at 11:15PM Oct 14, 2021Observed: 2.5 ft at 11:30PM Oct 14, 2021Observed: 2.49 ft at 11:45PM Oct 14, 2021Observed: 2.49 ft at 12:00AM Oct 15, 2021Observed: 2.48 ft at 12:15AM Oct 15, 2021Observed: 2.48 ft at 12:30AM Oct 15, 2021Observed: 2.47 ft at 12:45AM Oct 15, 2021Observed: 2.47 ft at 1:00AM Oct 15, 2021Observed: 2.47 ft at 1:15AM Oct 15, 2021Observed: 2.46 ft at 1:30AM Oct 15, 2021Observed: 2.46 ft at 1:45AM Oct 15, 2021Observed: 2.45 ft at 2:00AM Oct 15, 2021Observed: 2.45 ft at 2:15AM Oct 15, 2021Observed: 2.45 ft at 2:30AM Oct 15, 2021Observed: 2.44 ft at 2:45AM Oct 15, 2021Observed: 2.44 ft at 3:00AM Oct 15, 2021Observed: 2.44 ft at 3:15AM Oct 15, 2021Observed: 2.44 ft at 3:30AM Oct 15, 2021Observed: 2.43 ft at 3:45AM Oct 15, 2021Observed: 2.43 ft at 4:00AM Oct 15, 2021Observed: 2.43 ft at 4:15AM Oct 15, 2021Observed: 2.42 ft at 4:30AM Oct 15, 2021Observed: 2.42 ft at 4:45AM Oct 15, 2021Observed: 2.42 ft at 5:00AM Oct 15, 2021Observed: 2.42 ft at 5:15AM Oct 15, 2021Observed: 2.41 ft at 5:30AM Oct 15, 2021Observed: 2.41 ft at 5:45AM Oct 15, 2021Observed: 2.41 ft at 6:00AM Oct 15, 2021Observed: 2.4 ft at 6:15AM Oct 15, 2021Observed: 2.4 ft at 6:30AM Oct 15, 2021Observed: 2.4 ft at 6:45AM Oct 15, 2021Observed: 2.4 ft at 7:00AM Oct 15, 2021Observed: 2.39 ft at 7:15AM Oct 15, 2021Observed: 2.39 ft at 7:30AM Oct 15, 2021Observed: 2.39 ft at 7:45AM Oct 15, 2021Observed: 2.38 ft at 8:00AM Oct 15, 2021Observed: 2.38 ft at 8:15AM Oct 15, 2021Observed: 2.38 ft at 8:30AM Oct 15, 2021Observed: 2.38 ft at 8:45AM Oct 15, 2021Observed: 2.38 ft at 9:00AM Oct 15, 2021Observed: 2.37 ft at 9:15AM Oct 15, 2021Observed: 2.37 ft at 9:30AM Oct 15, 2021Observed: 2.37 ft at 9:45AM Oct 15, 2021Observed: 2.37 ft at 10:00AM Oct 15, 2021Observed: 2.37 ft at 10:15AM Oct 15, 2021Observed: 2.36 ft at 10:30AM Oct 15, 2021Observed: 2.36 ft at 10:45AM Oct 15, 2021Observed: 2.36 ft at 11:00AM Oct 15, 2021Observed: 2.36 ft at 11:15AM Oct 15, 2021Observed: 2.36 ft at 11:30AM Oct 15, 2021Observed: 2.35 ft at 11:45AM Oct 15, 2021Observed: 2.35 ft at 12:00PM Oct 15, 2021Observed: 2.35 ft at 12:15PM Oct 15, 2021Observed: 2.35 ft at 12:30PM Oct 15, 2021Observed: 2.35 ft at 12:45PM Oct 15, 2021Observed: 2.35 ft at 1:00PM Oct 15, 2021Observed: 2.35 ft at 1:15PM Oct 15, 2021Observed: 2.37 ft at 1:30PM Oct 15, 2021Observed: 2.39 ft at 1:45PM Oct 15, 2021Observed: 2.41 ft at 2:00PM Oct 15, 2021Observed: 2.42 ft at 2:15PM Oct 15, 2021Observed: 2.43 ft at 2:30PM Oct 15, 2021Observed: 2.43 ft at 2:45PM Oct 15, 2021Observed: 2.43 ft at 3:00PM Oct 15, 2021Observed: 2.42 ft at 3:15PM Oct 15, 2021Observed: 2.41 ft at 3:30PM Oct 15, 2021Observed: 2.41 ft at 3:45PM Oct 15, 2021Observed: 2.41 ft at 4:00PM Oct 15, 2021Observed: 2.41 ft at 4:15PM Oct 15, 2021Observed: 2.41 ft at 4:30PM Oct 15, 2021Observed: 2.42 ft at 4:45PM Oct 15, 2021Observed: 2.43 ft at 5:00PM Oct 15, 2021Observed: 2.43 ft at 5:15PM Oct 15, 2021Observed: 2.44 ft at 5:30PM Oct 15, 2021Observed: 2.44 ft at 5:45PM Oct 15, 2021Observed: 2.45 ft at 6:00PM Oct 15, 2021Observed: 2.45 ft at 6:15PM Oct 15, 2021Observed: 2.45 ft at 6:30PM Oct 15, 2021Observed: 2.45 ft at 6:45PM Oct 15, 2021Observed: 2.45 ft at 7:00PM Oct 15, 2021Observed: 2.45 ft at 7:15PM Oct 15, 2021Observed: 2.45 ft at 7:30PM Oct 15, 2021Observed: 2.45 ft at 7:45PM Oct 15, 2021Observed: 2.44 ft at 8:00PM Oct 15, 2021Observed: 2.44 ft at 8:15PM Oct 15, 2021Observed: 2.44 ft at 8:30PM Oct 15, 2021Observed: 2.43 ft at 8:45PM Oct 15, 2021Observed: 2.43 ft at 9:00PM Oct 15, 2021Observed: 2.43 ft at 9:15PM Oct 15, 2021Observed: 2.42 ft at 9:30PM Oct 15, 2021Observed: 2.42 ft at 9:45PM Oct 15, 2021Observed: 2.42 ft at 10:00PM Oct 15, 2021Observed: 2.43 ft at 10:15PM Oct 15, 2021Observed: 2.43 ft at 10:30PM Oct 15, 2021Observed: 2.43 ft at 10:45PM Oct 15, 2021Observed: 2.43 ft at 11:00PM Oct 15, 2021Observed: 2.43 ft at 11:15PM Oct 15, 2021Observed: 2.44 ft at 11:30PM Oct 15, 2021Observed: 2.44 ft at 11:45PM Oct 15, 2021Observed: 2.44 ft at 12:00AM Oct 16, 2021Observed: 2.44 ft at 12:15AM Oct 16, 2021Observed: 2.44 ft at 12:30AM Oct 16, 2021Observed: 2.44 ft at 12:45AM Oct 16, 2021Observed: 2.44 ft at 1:00AM Oct 16, 2021Observed: 2.43 ft at 1:15AM Oct 16, 2021Observed: 2.43 ft at 1:30AM Oct 16, 2021Observed: 2.42 ft at 1:45AM Oct 16, 2021Observed: 2.42 ft at 2:00AM Oct 16, 2021Observed: 2.41 ft at 2:15AM Oct 16, 2021Observed: 2.4 ft at 2:30AM Oct 16, 2021Observed: 2.4 ft at 2:45AM Oct 16, 2021Observed: 2.39 ft at 3:00AM Oct 16, 2021Observed: 2.38 ft at 3:15AM Oct 16, 2021Observed: 2.38 ft at 3:30AM Oct 16, 2021Observed: 2.37 ft at 3:45AM Oct 16, 2021Observed: 2.37 ft at 4:00AM Oct 16, 2021Observed: 2.36 ft at 4:15AM Oct 16, 2021Observed: 2.36 ft at 4:30AM Oct 16, 2021Observed: 2.35 ft at 4:45AM Oct 16, 2021Observed: 2.35 ft at 5:00AM Oct 16, 2021Observed: 2.34 ft at 5:15AM Oct 16, 2021Observed: 2.34 ft at 5:30AM Oct 16, 2021Observed: 2.33 ft at 5:45AM Oct 16, 2021Observed: 2.33 ft at 6:00AM Oct 16, 2021Observed: 2.33 ft at 6:15AM Oct 16, 2021Observed: 2.32 ft at 6:30AM Oct 16, 2021Observed: 2.32 ft at 6:45AM Oct 16, 2021Observed: 2.32 ft at 7:00AM Oct 16, 2021Observed: 2.32 ft at 7:15AM Oct 16, 2021Observed: 2.31 ft at 7:30AM Oct 16, 2021Observed: 2.31 ft at 7:45AM Oct 16, 2021Observed: 2.31 ft at 8:00AM Oct 16, 2021Observed: 2.31 ft at 8:15AM Oct 16, 2021Observed: 2.31 ft at 8:30AM Oct 16, 2021Observed: 2.3 ft at 8:45AM Oct 16, 2021Observed: 2.3 ft at 9:00AM Oct 16, 2021Observed: 2.3 ft at 9:15AM Oct 16, 2021Observed: 2.3 ft at 9:30AM Oct 16, 2021Observed: 2.3 ft at 9:45AM Oct 16, 2021Observed: 2.3 ft at 10:00AM Oct 16, 2021Observed: 2.3 ft at 10:15AM Oct 16, 2021Observed: 2.29 ft at 10:30AM Oct 16, 2021Observed: 2.29 ft at 10:45AM Oct 16, 2021Observed: 2.29 ft at 11:00AM Oct 16, 2021Observed: 2.29 ft at 11:15AM Oct 16, 2021Observed: 2.29 ft at 11:30AM Oct 16, 2021Observed: 2.29 ft at 11:45AM Oct 16, 2021Observed: 2.29 ft at 12:00PM Oct 16, 2021Observed: 2.29 ft at 12:15PM Oct 16, 2021Observed: 2.28 ft at 12:30PM Oct 16, 2021Observed: 2.28 ft at 12:45PM Oct 16, 2021Observed: 2.28 ft at 1:00PM Oct 16, 2021Observed: 2.28 ft at 1:15PM Oct 16, 2021Observed: 2.28 ft at 1:30PM Oct 16, 2021Observed: 2.28 ft at 1:45PM Oct 16, 2021Observed: 2.28 ft at 2:00PM Oct 16, 2021Observed: 2.28 ft at 2:15PM Oct 16, 2021Observed: 2.28 ft at 2:30PM Oct 16, 2021Observed: 2.27 ft at 2:45PM Oct 16, 2021Observed: 2.27 ft at 3:00PM Oct 16, 2021Observed: 2.27 ft at 3:15PM Oct 16, 2021Observed: 2.27 ft at 3:30PM Oct 16, 2021Observed: 2.27 ft at 3:45PM Oct 16, 2021Observed: 2.27 ft at 4:00PM Oct 16, 2021Observed: 2.27 ft at 4:15PM Oct 16, 2021Observed: 2.26 ft at 4:30PM Oct 16, 2021Observed: 2.26 ft at 4:45PM Oct 16, 2021Observed: 2.26 ft at 5:00PM Oct 16, 2021Observed: 2.26 ft at 5:15PM Oct 16, 2021Observed: 2.26 ft at 5:30PM Oct 16, 2021Observed: 2.26 ft at 5:45PM Oct 16, 2021Observed: 2.25 ft at 6:00PM Oct 16, 2021Observed: 2.25 ft at 6:15PM Oct 16, 2021Observed: 2.25 ft at 6:30PM Oct 16, 2021Observed: 2.25 ft at 6:45PM Oct 16, 2021Observed: 2.25 ft at 7:00PM Oct 16, 2021Observed: 2.25 ft at 7:15PM Oct 16, 2021Observed: 2.25 ft at 7:30PM Oct 16, 2021Observed: 2.25 ft at 7:45PM Oct 16, 2021Observed: 2.24 ft at 8:00PM Oct 16, 2021Observed: 2.24 ft at 8:15PM Oct 16, 2021Observed: 2.24 ft at 8:30PM Oct 16, 2021Observed: 2.24 ft at 8:45PM Oct 16, 2021Observed: 2.24 ft at 9:00PM Oct 16, 2021Observed: 2.24 ft at 9:15PM Oct 16, 2021USGS--Water Resources of the United StatesMKHI2(plotting HGIRG) Graph Created (9:55PM Oct 16, 2021)ObservedLatest observed value: 2.24 ft at 9:15 PM CDT 16-Oct-2021. Flood Stage is 10 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Graphical forecasts are not available for the Calumet Union Drainage Canal at Markham. During times of high water, forecast crest information can be found in the text products.
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Flood Categories (in feet)
Major Flood Stage: 11.5
Moderate Flood Stage: 10.5
Flood Stage: 10
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 8.64 ft on 05/17/2020
(2) 8.24 ft on 07/19/2020

(P): Preliminary values subject to further review.

Recent Crests
(1) 8.24 ft on 07/19/2020
(2) 8.64 ft on 05/17/2020

(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.

Zoom Level:15
KML Image
Gauge LocationGauge Map Marker
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
If you notice any errors in the below information, please contact our Webmaster
12.5 Widespread inundation of roadways and structures in the floodplain reaches 2 blocks from the canal in Markham and Harvey.
11 Multiple structures are threatened in Markham and Harvey.
10 Multiple roadways are threatened in Markham and Harvey. Low-lying sections of Martin Luther King Park are inundated in Markham.
9 Water overflows low-lying river banks along the canal in Markham and Harvey.
About This Location Collapse

Latitude: 41.596700° N, Longitude: 87.666400° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 10 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 597.14 607.14 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:

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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: 2-Nov-2020 7:29 PM
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