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Hydrograph River at a Glance Download
Mississippi River at Genoa Tailwater (ft)Flow (kcfs)Observed: 624.54 ft at 8:00AM Jan 18, 2017Observed: 625.01 ft at 12:00PM Jan 18, 2017Observed: 625.09 ft at 4:00PM Jan 18, 2017Observed: 625.09 ft at 5:43PM Jan 18, 2017Observed: 625.1 ft at 8:00PM Jan 18, 2017Highest Observation: 625.11 ft at 12:00AM Jan 19, 2017Highest Observation: 625.11 ft at 12:43AM Jan 19, 2017Highest Observation: 625.11 ft at 4:00AM Jan 19, 2017Highest Observation: 625.11 ft at 6:00AM Jan 19, 2017Highest Observation: 625.11 ft at 8:00AM Jan 19, 2017Observed: 625.08 ft at 12:00PM Jan 19, 2017Observed: 625.07 ft at 4:00PM Jan 19, 2017Observed: 625.06 ft at 8:00PM Jan 19, 2017Observed: 625.04 ft at 12:00AM Jan 20, 2017Observed: 625.04 ft at 4:00AM Jan 20, 2017Observed: 625.02 ft at 6:00AM Jan 20, 2017Observed: 625.02 ft at 8:00AM Jan 20, 2017Observed: 624.87 ft at 12:00PM Jan 20, 2017Observed: 624.82 ft at 4:00PM Jan 20, 2017Observed: 624.8 ft at 12:43AM Jan 21, 2017Observed: 624.79 ft at 6:00AM Jan 21, 2017USACE - Rivergages.comGENW3(plotting HTIRZ) Graph Created (7:00AM Jan 21, 2017)ObservedLatest observed value: 624.79 ft at 6:00 AM CST 21-Jan-2017. Flood Stage is 631 ft
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Tabular Data (CST)
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Datum: Not Available
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Mississippi River at Genoa are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - at Lansing
Flood Categories (in feet)
Major Flood Stage: 636
Moderate Flood Stage: 634
Flood Stage: 631
Action Stage: 629
Low Stage (in feet): -9999

Historic Crests
(1) 638.40 ft on 04/22/1965
(2) 636.45 ft on 04/12/1997
(3) 636.21 ft on 04/18/2001
(4) 635.24 ft on 04/20/1969
(5) 634.52 ft on 04/20/1952
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(P): Preliminary values subject to further review.

Recent Crests
(1) 631.19 ft on 09/27/2016
(2) 633.50 ft on 04/16/2011
(3) 632.40 ft on 09/28/2010 (P)
(4) 636.21 ft on 04/18/2001
(5) 636.45 ft on 04/12/1997
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(P): Preliminary values subject to further review.

Low Water Records
(1) 615.30 ft on 08/18/1936
(2) 616.09 ft on 10/09/1937
(3) 617.39 ft on 01/21/1938
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For more information on your flood risk go to

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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.
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639.5 Water begins to go over the protective earthen dikes.
639 Water begins to flow over the lock walls at Dam 8.
638.4 Water levels reach the flood of record.
636 Lock and dam 8 is closed to navigation.
(1) Upstream view at Genoa Dam 8, October 16th, 2012
(2) Downstream view at Genoa Dam 8, October 16th, 2012
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Latitude: 43.569444° N, Longitude: 91.229722° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 616.8 ft 631 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 616.8)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available 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 U.S. Army Corps of Engineers utilizes the 1912 Datum

Current/Historical Observations:

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