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Advanced Hydrologic Prediction Service
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This probabilistic forecast is issued by the North Central River Forecast Center.
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About this graph
Forecasts for the Mississippi River below Lock and Dam 4 - Alma are issued routinely during the navigation season, and as needed at other times of the year.

Vertical Datum is the USACE 1912 datum

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Upstream Gauge - at Wabasha - Pool 4 Upstream Gauge
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 18
Moderate Flood Stage: 17
Flood Stage: 16
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 19.78 ft on 04/19/1965
(2) 18.15 ft on 04/16/2001
(3) 17.53 ft on 04/18/1969
(4) 17.05 ft on 04/25/2023
(5) 16.30 ft on 04/18/1952
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 17.05 ft on 04/25/2023
(2) 14.75 ft on 04/14/2011
(3) 12.34 ft on 09/29/2010
(4) 18.15 ft on 04/16/2001
(5) 15.60 ft on 04/11/1997
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.40 ft on 01/22/1944
(2) 1.83 ft on 12/12/1960
(3) 2.61 ft on 07/22/1936
Show More Low Water Records
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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
20 Water reaches the top of the protective earthen dike.
19.8 The water reaches the flood of record set in 1965.
16.5 Agriculture and recreational land is flooded.
16 Lock gates and walls at Dam 4 go underwater.
15.5 Lock and Dam 4 is closed to navigation.
Photos
(1) Downstream view at Alma, September 11th, 2012, Stage = 4.47 ft
(2) Upstream view at Alma, September 11th, 2012, Stage = 4.47 ft

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
  • How low could the river get?
  • Link to text page with Hourly River Stage Level and Water Temperatures And Latest Flow For Selected Sites
  • Link to river gage data along Navigational Mississippi River from Twin Cities to Lock and Dam 10
  • Link to Lock & Dam data and other locations in USACE’s St. Paul District
  • 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.
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    Page last modified: 2-Nov-2020 7:29 PM
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