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Hydrograph River at a Glance Download
Big Sioux River at Sioux Falls Maple Street Stage (ft)Flow (cfs)USGS--Water Resources of the United StatesSFMS2(plotting HGIRG) Graph Created (8:34AM Jan 22, 2022)Flood Stage is 15 ft
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Tabular Data (UTC)
Tabular Data (CST)
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Datum: NAVD88
NOTE: No forecasts are available for this location

NOTE: Gauge reading may be affected by ice.

NOTE: Forecasts are not available for the Big Sioux River at Sioux Falls Maple Street. Only observed stages are available for this point.

Vertical Datum updated from NGVD29 to NAVD88 by gauge owner.

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Upstream Gauge - at Sioux Falls I-90 Upstream Gauge Downstream Gauge Downstream Gauge - at Sioux Falls Western Avenue
Flood Categories (in feet)
Major Flood Stage: 21
Moderate Flood Stage: 18
Flood Stage: 15
Action Stage: 14
Low Stage (in feet): -9999

Historic Crests
(1) 9.19 ft on 03/25/2019
(2) 7.59 ft on 05/17/2007
(3) 7.24 ft on 06/15/2014
(4) 6.99 ft on 05/09/2013
(5) 6.14 ft on 07/27/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.44 ft on 06/09/2020
(2) 9.19 ft on 03/25/2019
(3) 5.78 ft on 07/30/2018
(4) 5.06 ft on 06/12/2017
(5) 5.41 ft on 03/30/2016
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:14
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Gauge LocationGauge Map Marker
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
19 water overtops the walk bridge near the gage.
18 water reaches the bottom of the walk bridge near the gage.
17 water reaches the low steel on the walk bridge near the gage.
15 water reaches the bottom of the levees. If there is a levee failure, flooding in Sioux Falls could occur.
(1) Upstream View
(2) Downstream View
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Latitude: 43.573056° N, Longitude: 96.763889° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 15 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 1404.48 1419.48 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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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
Sioux Falls Weather Forecast Office
26 Weather Lane
Sioux Falls, SD 57104-0198
(605) 330-4247
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Page last modified: 2-Nov-2020 7:29 PM
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