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Hydrograph River at a Glance Download
Big Sioux River near Brookings Stage (ft)Flow (cfs)Highest Observation: 0.1 ft at 10:00PM Aug 17, 2022Highest Observation: 0.1 ft at 10:15PM Aug 17, 2022Highest Observation: 0.1 ft at 10:30PM Aug 17, 2022Highest Observation: 0.1 ft at 10:45PM Aug 17, 2022Highest Observation: 0.1 ft at 11:00PM Aug 17, 2022Highest Observation: 0.1 ft at 11:15PM Aug 17, 2022Highest Observation: 0.1 ft at 11:30PM Aug 17, 2022Highest Observation: 0.1 ft at 11:45PM Aug 17, 2022Highest Observation: 0.1 ft at 12:00AM Aug 18, 2022Highest Observation: 0.1 ft at 12:15AM Aug 18, 2022Highest Observation: 0.1 ft at 12:30AM Aug 18, 2022Highest Observation: 0.1 ft at 12:45AM Aug 18, 2022Highest Observation: 0.1 ft at 1:00AM Aug 18, 2022Highest Observation: 0.1 ft at 1:15AM Aug 18, 2022Highest Observation: 0.1 ft at 1:30AM Aug 18, 2022Highest Observation: 0.1 ft at 1:45AM Aug 18, 2022Highest Observation: 0.1 ft at 2:00AM Aug 18, 2022Highest Observation: 0.1 ft at 2:15AM Aug 18, 2022Highest Observation: 0.1 ft at 2:30AM Aug 18, 2022Highest Observation: 0.1 ft at 2:45AM Aug 18, 2022Highest Observation: 0.1 ft at 3:00AM Aug 18, 2022Highest Observation: 0.1 ft at 3:15AM Aug 18, 2022Highest Observation: 0.1 ft at 3:30AM Aug 18, 2022Highest Observation: 0.1 ft at 3:45AM Aug 18, 2022Highest Observation: 0.1 ft at 4:00AM Aug 18, 2022Highest Observation: 0.1 ft at 4:15AM Aug 18, 2022Highest Observation: 0.1 ft at 4:30AM Aug 18, 2022Highest Observation: 0.1 ft at 4:45AM Aug 18, 2022Highest Observation: 0.1 ft at 5:00AM Aug 18, 2022Highest Observation: 0.1 ft at 5:15AM Aug 18, 2022Highest Observation: 0.1 ft at 5:30AM Aug 18, 2022Highest Observation: 0.1 ft at 5:45AM Aug 18, 2022Highest Observation: 0.1 ft at 6:00AM Aug 18, 2022Highest Observation: 0.1 ft at 6:15AM Aug 18, 2022Highest Observation: 0.1 ft at 6:30AM Aug 18, 2022Highest Observation: 0.1 ft at 6:45AM Aug 18, 2022Highest Observation: 0.1 ft at 7:00AM Aug 18, 2022Highest Observation: 0.1 ft at 7:15AM Aug 18, 2022Highest Observation: 0.1 ft at 7:30AM Aug 18, 2022Highest Observation: 0.1 ft at 7:45AM Aug 18, 2022Highest Observation: 0.1 ft at 8:00AM Aug 18, 2022Highest Observation: 0.1 ft at 8:15AM Aug 18, 2022Highest Observation: 0.1 ft at 8:30AM Aug 18, 2022Highest Observation: 0.1 ft at 8:45AM Aug 18, 2022Highest Observation: 0.1 ft at 9:00AM Aug 18, 2022Highest Observation: 0.1 ft at 9:15AM Aug 18, 2022Highest Observation: 0.1 ft at 9:30AM Aug 18, 2022Highest Observation: 0.1 ft at 9:45AM Aug 18, 2022Highest Observation: 0.1 ft at 10:00AM Aug 18, 2022Highest Observation: 0.1 ft at 10:15AM Aug 18, 2022Highest Observation: 0.1 ft at 10:30AM Aug 18, 2022Highest Observation: 0.1 ft at 10:45AM Aug 18, 2022Highest Observation: 0.1 ft at 11:00AM Aug 18, 2022Highest Observation: 0.1 ft at 11:15AM Aug 18, 2022Highest Observation: 0.1 ft at 11:30AM Aug 18, 2022Highest Observation: 0.1 ft at 11:45AM Aug 18, 2022Highest Observation: 0.1 ft at 12:00PM Aug 18, 2022Highest Observation: 0.1 ft at 12:15PM Aug 18, 2022Highest Observation: 0.1 ft at 12:30PM Aug 18, 2022Highest Observation: 0.1 ft at 12:45PM Aug 18, 2022Highest Observation: 0.1 ft at 1:00PM Aug 18, 2022Highest Observation: 0.1 ft at 1:15PM Aug 18, 2022Highest Observation: 0.1 ft at 1:30PM Aug 18, 2022Highest Observation: 0.1 ft at 1:45PM Aug 18, 2022Highest Observation: 0.1 ft at 2:00PM Aug 18, 2022Highest Observation: 0.1 ft at 2:15PM Aug 18, 2022Highest Observation: 0.1 ft at 2:30PM Aug 18, 2022Highest Observation: 0.1 ft at 2:45PM Aug 18, 2022Highest Observation: 0.1 ft at 3:00PM Aug 18, 2022Highest Observation: 0.1 ft at 3:15PM Aug 18, 2022Highest Observation: 0.1 ft at 3:30PM Aug 18, 2022Highest Observation: 0.1 ft at 3:45PM Aug 18, 2022Highest Observation: 0.1 ft at 4:00PM Aug 18, 2022Highest Observation: 0.1 ft at 4:15PM Aug 18, 2022Highest Observation: 0.1 ft at 4:30PM Aug 18, 2022Highest Observation: 0.1 ft at 4:45PM Aug 18, 2022Highest Observation: 0.1 ft at 5:00PM Aug 18, 2022Highest Observation: 0.1 ft at 5:15PM Aug 18, 2022Highest Observation: 0.1 ft at 5:30PM Aug 18, 2022Highest Observation: 0.1 ft at 5:45PM Aug 18, 2022Highest Observation: 0.1 ft at 6:00PM Aug 18, 2022Highest Observation: 0.1 ft at 6:15PM Aug 18, 2022Highest Observation: 0.1 ft at 6:30PM Aug 18, 2022Highest Observation: 0.1 ft at 6:45PM Aug 18, 2022Highest Observation: 0.1 ft at 7:00PM Aug 18, 2022Highest Observation: 0.1 ft at 7:15PM Aug 18, 2022Highest Observation: 0.1 ft at 7:30PM Aug 18, 2022Highest Observation: 0.1 ft at 7:45PM Aug 18, 2022Highest Observation: 0.1 ft at 8:00PM Aug 18, 2022Highest Observation: 0.1 ft at 8:15PM Aug 18, 2022Highest Observation: 0.1 ft at 8:30PM Aug 18, 2022Highest Observation: 0.1 ft at 8:45PM Aug 18, 2022Highest Observation: 0.1 ft at 9:00PM Aug 18, 2022Highest Observation: 0.1 ft at 9:15PM Aug 18, 2022Highest Observation: 0.1 ft at 9:30PM Aug 18, 2022Highest Observation: 0.1 ft at 9:45PM Aug 18, 2022Highest Observation: 0.1 ft at 10:00PM Aug 18, 2022Highest Observation: 0.1 ft at 10:15PM Aug 18, 2022Highest Observation: 0.1 ft at 10:30PM Aug 18, 2022Highest Observation: 0.1 ft at 10:45PM Aug 18, 2022Highest Observation: 0.1 ft at 11:00PM Aug 18, 2022Highest Observation: 0.1 ft at 11:15PM Aug 18, 2022Highest Observation: 0.1 ft at 11:30PM Aug 18, 2022Highest Observation: 0.1 ft at 11:45PM Aug 18, 2022USGS--Water Resources of the United StatesBRKS2(plotting HGIRG) Graph Created (12:04AM Aug 19, 2022)ObservedLatest observed value: 0.1 ft at 11:45 PM CDT 18-Aug-2022. Flood Stage is 9 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Big Sioux River near Brookings are issued as needed during times of high water, but are not routinely available.

Vertical Datum updated from NGVD29 to NAVD88 by gauge owner.

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Upstream Gauge - near Medary Upstream Gauge Downstream Gauge Downstream Gauge - above Flandreau
Flood Categories (in feet)
Major Flood Stage: 12
Moderate Flood Stage: 10.5
Flood Stage: 9
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 14.77 ft on 04/09/1969
(2) 14.34 ft on 09/13/2019
(3) 13.70 ft on 06/22/1984
(4) 13.66 ft on 09/25/2010
(5) 13.50 ft on 07/04/1993
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.05 ft on 03/12/2020
(2) 14.34 ft on 09/13/2019
(3) 13.11 ft on 03/22/2019 (P)
(4) 12.30 ft on 04/24/2018
(5) 7.40 ft on 05/25/2017
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
16 the bridges on 473rd Avenue and 475th Avenue are overtopped.
14 the water reaches the bottom of the bridges on 473rd Avenue and 475th Avenue.
13 the bridge 1 mile south of Medary on 471st Avenue is overtopped.
12 475th Avenue and 222nd Street being to flood.
11.7 473rd Avenue at 221st Street begins to flood.
11 some farm outbuildings begin to flood.
10.3 473rd Avenue north of the gauge begins to flood.
10 flooding begins to affect agricultural lands along the right bank of the river.
9 significant amounts of pasture and farm lands begin flooding on the left bank of the river. The road south of the Brookings water treatment plant is flooded, as is 217th Street between 468th and 469th Avenues.
8 there is some minor overflow of the lowest banks along this stretch of the river.
Photos
(1) Upstream View
(2) Downstream View
About This Location Collapse

Latitude: 44.180278° N, Longitude: 96.749167° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 9 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 1552.78 1561.78 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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