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Hydrograph River at a Glance Download
Big Sioux River near Florence Stage (ft)Flow (cfs)Observed: 3.5 ft at 6:30AM May 27, 2023Observed: 3.49 ft at 6:45AM May 27, 2023Observed: 3.5 ft at 7:00AM May 27, 2023Observed: 3.5 ft at 7:15AM May 27, 2023Observed: 3.5 ft at 7:30AM May 27, 2023Observed: 3.5 ft at 7:45AM May 27, 2023Observed: 3.5 ft at 8:00AM May 27, 2023Observed: 3.5 ft at 8:15AM May 27, 2023Observed: 3.5 ft at 8:30AM May 27, 2023Observed: 3.5 ft at 8:45AM May 27, 2023Observed: 3.5 ft at 9:00AM May 27, 2023Observed: 3.5 ft at 9:15AM May 27, 2023Observed: 3.5 ft at 9:30AM May 27, 2023Observed: 3.5 ft at 9:45AM May 27, 2023Observed: 3.5 ft at 10:00AM May 27, 2023Observed: 3.51 ft at 10:15AM May 27, 2023Observed: 3.5 ft at 10:30AM May 27, 2023Observed: 3.5 ft at 10:45AM May 27, 2023Observed: 3.51 ft at 11:00AM May 27, 2023Observed: 3.51 ft at 11:15AM May 27, 2023Observed: 3.51 ft at 11:30AM May 27, 2023Observed: 3.5 ft at 11:45AM May 27, 2023Observed: 3.5 ft at 12:00PM May 27, 2023Observed: 3.5 ft at 12:15PM May 27, 2023Observed: 3.5 ft at 12:30PM May 27, 2023Observed: 3.5 ft at 12:45PM May 27, 2023Observed: 3.5 ft at 1:00PM May 27, 2023Observed: 3.5 ft at 1:01PM May 27, 2023Observed: 3.5 ft at 1:15PM May 27, 2023Observed: 3.5 ft at 1:16PM May 27, 2023Observed: 3.51 ft at 1:30PM May 27, 2023Observed: 3.51 ft at 1:31PM May 27, 2023Observed: 3.5 ft at 1:45PM May 27, 2023Observed: 3.51 ft at 2:00PM May 27, 2023Observed: 3.5 ft at 2:15PM May 27, 2023Observed: 3.51 ft at 2:30PM May 27, 2023Observed: 3.51 ft at 2:45PM May 27, 2023Observed: 3.5 ft at 3:00PM May 27, 2023Observed: 3.51 ft at 3:15PM May 27, 2023Observed: 3.51 ft at 3:30PM May 27, 2023Observed: 3.51 ft at 3:45PM May 27, 2023Observed: 3.52 ft at 4:00PM May 27, 2023Observed: 3.52 ft at 4:15PM May 27, 2023Observed: 3.52 ft at 4:30PM May 27, 2023Observed: 3.52 ft at 4:45PM May 27, 2023Observed: 3.52 ft at 5:00PM May 27, 2023Observed: 3.52 ft at 5:15PM May 27, 2023Observed: 3.52 ft at 5:30PM May 27, 2023Observed: 3.52 ft at 5:45PM May 27, 2023Observed: 3.52 ft at 6:00PM May 27, 2023Observed: 3.52 ft at 6:15PM May 27, 2023Observed: 3.52 ft at 6:30PM May 27, 2023Observed: 3.52 ft at 6:45PM May 27, 2023Observed: 3.52 ft at 7:00PM May 27, 2023Observed: 3.52 ft at 7:15PM May 27, 2023Observed: 3.52 ft at 7:30PM May 27, 2023Observed: 3.52 ft at 7:45PM May 27, 2023Observed: 3.51 ft at 8:00PM May 27, 2023Observed: 3.51 ft at 8:15PM May 27, 2023Observed: 3.51 ft at 8:30PM May 27, 2023Observed: 3.5 ft at 8:45PM May 27, 2023Observed: 3.5 ft at 9:00PM May 27, 2023Observed: 3.5 ft at 9:01PM May 27, 2023Observed: 3.5 ft at 9:15PM May 27, 2023Observed: 3.5 ft at 9:16PM May 27, 2023Observed: 3.5 ft at 9:30PM May 27, 2023Observed: 3.5 ft at 9:31PM May 27, 2023Observed: 3.49 ft at 9:45PM May 27, 2023Observed: 3.5 ft at 10:00PM May 27, 2023Observed: 3.5 ft at 10:15PM May 27, 2023Observed: 3.49 ft at 10:30PM May 27, 2023Observed: 3.49 ft at 10:45PM May 27, 2023Observed: 3.49 ft at 11:00PM May 27, 2023Observed: 3.49 ft at 11:15PM May 27, 2023Observed: 3.49 ft at 11:30PM May 27, 2023Observed: 3.49 ft at 11:45PM May 27, 2023Observed: 3.48 ft at 12:00AM May 28, 2023Observed: 3.48 ft at 12:15AM May 28, 2023Observed: 3.48 ft at 12:30AM May 28, 2023Observed: 3.48 ft at 12:45AM May 28, 2023Observed: 3.48 ft at 1:00AM May 28, 2023Observed: 3.48 ft at 1:15AM May 28, 2023Observed: 3.48 ft at 1:30AM May 28, 2023Observed: 3.48 ft at 1:45AM May 28, 2023Observed: 3.48 ft at 2:00AM May 28, 2023Observed: 3.48 ft at 2:15AM May 28, 2023Observed: 3.48 ft at 2:30AM May 28, 2023Observed: 3.47 ft at 2:45AM May 28, 2023Observed: 3.48 ft at 3:00AM May 28, 2023Observed: 3.48 ft at 3:15AM May 28, 2023Observed: 3.47 ft at 3:30AM May 28, 2023Observed: 3.47 ft at 3:45AM May 28, 2023Observed: 3.47 ft at 4:00AM May 28, 2023Observed: 3.47 ft at 4:15AM May 28, 2023Observed: 3.48 ft at 4:30AM May 28, 2023Observed: 3.47 ft at 4:45AM May 28, 2023Observed: 3.48 ft at 5:00AM May 28, 2023Observed: 3.48 ft at 5:01AM May 28, 2023Observed: 3.47 ft at 5:15AM May 28, 2023Observed: 3.47 ft at 5:16AM May 28, 2023Observed: 3.47 ft at 5:30AM May 28, 2023Observed: 3.47 ft at 5:31AM May 28, 2023Observed: 3.47 ft at 5:45AM May 28, 2023Observed: 3.47 ft at 6:00AM May 28, 2023Observed: 3.47 ft at 6:15AM May 28, 2023Observed: 3.47 ft at 6:30AM May 28, 2023Observed: 3.47 ft at 6:45AM May 28, 2023Observed: 3.46 ft at 7:00AM May 28, 2023Observed: 3.47 ft at 7:15AM May 28, 2023Observed: 3.47 ft at 7:30AM May 28, 2023Observed: 3.47 ft at 7:45AM May 28, 2023Observed: 3.47 ft at 8:00AM May 28, 2023Observed: 3.48 ft at 8:15AM May 28, 2023Observed: 3.47 ft at 8:30AM May 28, 2023Observed: 3.47 ft at 8:45AM May 28, 2023Observed: 3.48 ft at 9:00AM May 28, 2023Observed: 3.48 ft at 9:15AM May 28, 2023Observed: 3.47 ft at 9:30AM May 28, 2023Observed: 3.47 ft at 9:45AM May 28, 2023Observed: 3.47 ft at 10:00AM May 28, 2023Observed: 3.47 ft at 10:15AM May 28, 2023Observed: 3.48 ft at 10:30AM May 28, 2023Observed: 3.48 ft at 10:45AM May 28, 2023Observed: 3.47 ft at 11:00AM May 28, 2023Observed: 3.48 ft at 11:15AM May 28, 2023Observed: 3.48 ft at 11:30AM May 28, 2023Observed: 3.49 ft at 11:45AM May 28, 2023Observed: 3.48 ft at 12:00PM May 28, 2023Observed: 3.49 ft at 12:15PM May 28, 2023Observed: 3.48 ft at 12:30PM May 28, 2023Observed: 3.48 ft at 12:45PM May 28, 2023Observed: 3.49 ft at 1:00PM May 28, 2023Observed: 3.49 ft at 1:15PM May 28, 2023Observed: 3.49 ft at 1:16PM May 28, 2023Observed: 3.49 ft at 1:30PM May 28, 2023Observed: 3.49 ft at 1:31PM May 28, 2023Observed: 3.49 ft at 1:45PM May 28, 2023Observed: 3.49 ft at 1:46PM May 28, 2023Observed: 3.49 ft at 2:00PM May 28, 2023Observed: 3.5 ft at 2:15PM May 28, 2023Observed: 3.5 ft at 2:30PM May 28, 2023Observed: 3.5 ft at 2:45PM May 28, 2023Observed: 3.5 ft at 3:00PM May 28, 2023Observed: 3.5 ft at 3:15PM May 28, 2023Observed: 3.51 ft at 3:30PM May 28, 2023Observed: 3.52 ft at 3:45PM May 28, 2023Observed: 3.52 ft at 4:00PM May 28, 2023Observed: 3.52 ft at 4:15PM May 28, 2023Observed: 3.52 ft at 4:30PM May 28, 2023Observed: 3.52 ft at 4:45PM May 28, 2023Observed: 3.53 ft at 5:00PM May 28, 2023Observed: 3.53 ft at 5:15PM May 28, 2023Observed: 3.53 ft at 5:30PM May 28, 2023Observed: 3.53 ft at 5:45PM May 28, 2023Observed: 3.54 ft at 6:00PM May 28, 2023Observed: 3.54 ft at 6:15PM May 28, 2023Observed: 3.54 ft at 6:30PM May 28, 2023Observed: 3.53 ft at 6:45PM May 28, 2023Observed: 3.54 ft at 7:00PM May 28, 2023Observed: 3.54 ft at 7:15PM May 28, 2023Observed: 3.54 ft at 7:30PM May 28, 2023Observed: 3.54 ft at 7:45PM May 28, 2023Observed: 3.54 ft at 8:00PM May 28, 2023Observed: 3.53 ft at 8:15PM May 28, 2023Observed: 3.53 ft at 8:30PM May 28, 2023Observed: 3.53 ft at 8:45PM May 28, 2023Observed: 3.53 ft at 9:00PM May 28, 2023Observed: 3.53 ft at 9:15PM May 28, 2023Observed: 3.52 ft at 9:30PM May 28, 2023Observed: 3.53 ft at 9:45PM May 28, 2023Observed: 3.52 ft at 10:00PM May 28, 2023Observed: 3.52 ft at 10:15PM May 28, 2023Observed: 3.53 ft at 10:30PM May 28, 2023Observed: 3.52 ft at 10:45PM May 28, 2023Observed: 3.52 ft at 11:00PM May 28, 2023Observed: 3.52 ft at 11:15PM May 28, 2023Observed: 3.52 ft at 11:30PM May 28, 2023Observed: 3.52 ft at 11:45PM May 28, 2023Observed: 3.52 ft at 12:00AM May 29, 2023Observed: 3.52 ft at 12:15AM May 29, 2023Observed: 3.51 ft at 12:30AM May 29, 2023Observed: 3.52 ft at 12:45AM May 29, 2023Observed: 3.51 ft at 1:00AM May 29, 2023Observed: 3.51 ft at 1:15AM May 29, 2023Observed: 3.51 ft at 1:30AM May 29, 2023Observed: 3.51 ft at 1:45AM May 29, 2023Observed: 3.51 ft at 2:00AM May 29, 2023Observed: 3.51 ft at 2:15AM May 29, 2023Observed: 3.51 ft at 2:30AM May 29, 2023Observed: 3.51 ft at 2:45AM May 29, 2023Observed: 3.51 ft at 3:00AM May 29, 2023Observed: 3.51 ft at 3:15AM May 29, 2023Observed: 3.51 ft at 3:30AM May 29, 2023Observed: 3.51 ft at 3:45AM May 29, 2023Observed: 3.51 ft at 4:00AM May 29, 2023Observed: 3.51 ft at 4:15AM May 29, 2023Observed: 3.51 ft at 4:30AM May 29, 2023Observed: 3.51 ft at 4:45AM May 29, 2023Observed: 3.51 ft at 5:00AM May 29, 2023Observed: 3.51 ft at 5:15AM May 29, 2023Observed: 3.51 ft at 5:16AM May 29, 2023Observed: 3.51 ft at 5:30AM May 29, 2023Observed: 3.51 ft at 5:31AM May 29, 2023Observed: 3.51 ft at 5:45AM May 29, 2023Observed: 3.51 ft at 5:46AM May 29, 2023Observed: 3.51 ft at 6:00AM May 29, 2023Observed: 3.51 ft at 6:15AM May 29, 2023Observed: 3.51 ft at 6:30AM May 29, 2023Observed: 3.52 ft at 6:45AM May 29, 2023Observed: 3.51 ft at 7:00AM May 29, 2023Observed: 3.51 ft at 7:15AM May 29, 2023Observed: 3.51 ft at 7:30AM May 29, 2023Observed: 3.51 ft at 7:45AM May 29, 2023Observed: 3.51 ft at 8:00AM May 29, 2023Observed: 3.51 ft at 8:15AM May 29, 2023Observed: 3.51 ft at 8:30AM May 29, 2023Observed: 3.51 ft at 8:45AM May 29, 2023Observed: 3.51 ft at 9:00AM May 29, 2023Observed: 3.52 ft at 9:15AM May 29, 2023Observed: 3.51 ft at 9:30AM May 29, 2023Observed: 3.51 ft at 9:45AM May 29, 2023Observed: 3.52 ft at 10:00AM May 29, 2023Observed: 3.51 ft at 10:15AM May 29, 2023Observed: 3.51 ft at 10:30AM May 29, 2023Observed: 3.52 ft at 10:45AM May 29, 2023Observed: 3.52 ft at 11:00AM May 29, 2023Observed: 3.52 ft at 11:15AM May 29, 2023Observed: 3.51 ft at 11:30AM May 29, 2023Observed: 3.52 ft at 11:45AM May 29, 2023Observed: 3.52 ft at 12:00PM May 29, 2023Observed: 3.52 ft at 12:15PM May 29, 2023Observed: 3.52 ft at 12:30PM May 29, 2023Observed: 3.52 ft at 12:45PM May 29, 2023Observed: 3.53 ft at 1:00PM May 29, 2023Observed: 3.53 ft at 1:15PM May 29, 2023Observed: 3.53 ft at 1:16PM May 29, 2023Observed: 3.53 ft at 1:30PM May 29, 2023Observed: 3.53 ft at 1:31PM May 29, 2023Observed: 3.53 ft at 1:45PM May 29, 2023Observed: 3.53 ft at 1:46PM May 29, 2023Observed: 3.53 ft at 2:00PM May 29, 2023Observed: 3.53 ft at 2:15PM May 29, 2023Observed: 3.54 ft at 2:30PM May 29, 2023Observed: 3.54 ft at 2:45PM May 29, 2023Observed: 3.55 ft at 3:00PM May 29, 2023Observed: 3.55 ft at 3:15PM May 29, 2023Observed: 3.56 ft at 3:30PM May 29, 2023Observed: 3.56 ft at 3:45PM May 29, 2023Observed: 3.57 ft at 4:00PM May 29, 2023Observed: 3.58 ft at 4:15PM May 29, 2023Observed: 3.58 ft at 4:30PM May 29, 2023Observed: 3.58 ft at 4:45PM May 29, 2023Observed: 3.59 ft at 5:00PM May 29, 2023Observed: 3.59 ft at 5:15PM May 29, 2023Observed: 3.59 ft at 5:30PM May 29, 2023Observed: 3.59 ft at 5:45PM May 29, 2023Observed: 3.6 ft at 6:00PM May 29, 2023Observed: 3.59 ft at 6:15PM May 29, 2023Observed: 3.6 ft at 6:30PM May 29, 2023Observed: 3.6 ft at 6:45PM May 29, 2023Observed: 3.6 ft at 7:00PM May 29, 2023Observed: 3.6 ft at 7:15PM May 29, 2023Observed: 3.6 ft at 7:30PM May 29, 2023Observed: 3.6 ft at 7:45PM May 29, 2023Observed: 3.6 ft at 8:00PM May 29, 2023Observed: 3.6 ft at 8:15PM May 29, 2023Observed: 3.6 ft at 8:30PM May 29, 2023Observed: 3.59 ft at 8:45PM May 29, 2023Observed: 3.6 ft at 9:00PM May 29, 2023Observed: 3.6 ft at 9:15PM May 29, 2023Observed: 3.6 ft at 9:16PM May 29, 2023Observed: 3.6 ft at 9:30PM May 29, 2023Observed: 3.6 ft at 9:31PM May 29, 2023Observed: 3.59 ft at 9:45PM May 29, 2023Observed: 3.59 ft at 9:46PM May 29, 2023Observed: 3.59 ft at 10:00PM May 29, 2023Observed: 3.59 ft at 10:15PM May 29, 2023Observed: 3.59 ft at 10:30PM May 29, 2023Observed: 3.58 ft at 10:45PM May 29, 2023Observed: 3.59 ft at 11:00PM May 29, 2023Observed: 3.58 ft at 11:15PM May 29, 2023Observed: 3.58 ft at 11:30PM May 29, 2023Observed: 3.58 ft at 11:45PM May 29, 2023Observed: 3.58 ft at 12:00AM May 30, 2023Observed: 3.57 ft at 12:15AM May 30, 2023Observed: 3.57 ft at 12:30AM May 30, 2023Observed: 3.57 ft at 12:45AM May 30, 2023Observed: 3.59 ft at 1:00AM May 30, 2023Observed: 3.59 ft at 1:15AM May 30, 2023Observed: 3.59 ft at 1:30AM May 30, 2023Observed: 3.6 ft at 1:45AM May 30, 2023Highest Observation: 3.62 ft at 2:00AM May 30, 2023Highest Observation: 3.62 ft at 2:15AM May 30, 2023Highest Observation: 3.62 ft at 2:30AM May 30, 2023Highest Observation: 3.62 ft at 2:45AM May 30, 2023Highest Observation: 3.62 ft at 3:00AM May 30, 2023Highest Observation: 3.62 ft at 3:15AM May 30, 2023Highest Observation: 3.62 ft at 3:30AM May 30, 2023Highest Observation: 3.62 ft at 3:45AM May 30, 2023Highest Observation: 3.62 ft at 4:00AM May 30, 2023Highest Observation: 3.62 ft at 4:15AM May 30, 2023Observed: 3.61 ft at 4:30AM May 30, 2023Highest Observation: 3.62 ft at 4:45AM May 30, 2023Highest Observation: 3.62 ft at 5:00AM May 30, 2023Highest Observation: 3.62 ft at 5:16AM May 30, 2023Observed: 3.61 ft at 5:31AM May 30, 2023Highest Observation: 3.62 ft at 5:46AM May 30, 2023USGS--Water Resources of the United StatesFLOS2(plotting HGIRG) Graph Created (6:15AM May 30, 2023)ObservedLatest observed value: 3.62 ft at 5:46 AM CDT 30-May-2023. Flood Stage is 8 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Forecasts are not available for the Big Sioux River near Florence. Only observed stages are available for this point.

Vertical Datum updated from NGVD29 to NAVD88 by gauge owner.

Return to Area Map
Downstream Gauge Downstream Gauge - near Watertown
Flood Categories (in feet)
Major Flood Stage: 9
Moderate Flood Stage: 8.5
Flood Stage: 8
Action Stage: 7
Low Stage (in feet): -9999

Historic Crests
(1) 9.52 ft on 04/02/1997
(2) 9.18 ft on 07/25/1993
(3) 9.08 ft on 03/29/1986
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 6.89 ft on 05/05/2020
(2) 8.95 ft on 03/27/2019
(3) 6.37 ft on 02/22/2017
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 www.floodsmart.gov.
Zoom Level:14
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 The bridge at the gauge and the bridge 2 miles south of the gauge are both overtopped
10.5 The bridge 1 mile north of the gauge is overtopped
10 The water reaches the bottom of the bridge at the gauge and the bridge 2 miles south of the gauge the bridge 1 mile east and 1 1/2 mile north of the gauge is overtopped
9 The water reaches the bottom of the bridge 1 mile north of the gauge
8.5 The water reaches the bottom of the bridge 1 mile east and 1 1/2 mile north of the gauge
About This Location Collapse

Latitude: 45.180833° N, Longitude: 97.185833° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 8 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 1781.54 1789.54 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
Aberdeen Weather Forecast Office
824 Brown County 14 South
Aberdeen, SD 57401
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