Skip Navigation Link  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left
Navigation Bar End Cap


This probabilistic forecast is issued by the Missouri Basin River Forecast Center.
tab left off Hydrograph tab right off tab left off River at a Glance tab right off tab left off Download tab right off tab left on tab right on
About this graph
Forecasts for the Floyd River at Alton are issued as needed during times of high water, but are not routinely available.
Return to Area Map

Upstream Gauge - at Sheldon Upstream Gauge Downstream Gauge Downstream Gauge - near Struble
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 18
Moderate Flood Stage: 16
Flood Stage: 12
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 21.96 ft on 09/20/2018
(2) 20.87 ft on 03/14/2019
(3) 20.50 ft on 06/21/2018
(4) 19.19 ft on 05/27/2013
(5) 18.54 ft on 06/20/1983
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.09 ft on 05/13/2023
(2) 6.43 ft on 06/25/2022
(3) 6.16 ft on 07/14/2021
(4) 8.82 ft on 05/27/2020
(5) 20.87 ft on 03/14/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
KML Image
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
19.2 both lanes of State Highway 60 around 480th Street begin to be inundated by flood water.
18 the entire flood plain is under water and the river is about 1/2 mile wide. The flooding still primarily only affects agricultural land and county roads.
16 significant amounts of crop and pasture land are flooded.
15 410th Street and Larch Avenue is inundated. Also 440th Street and Kingbird Avenue is flooded, and the water reaches the bottom of the bridge at CR L14 and 440th Street.
12 flooding begins to affect the lower lying agricultural lands along the river.
(1) Upstream View
(2) Downstream View

Other Real-time and/or Archive Data Sources:

Additional Information Collapse

USGS 7-Day Streamflow Historical Comparison USGS WaterWatch Webpage

How low could the river get?

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.
NWS Information
National Weather Service
Sioux Falls Weather Forecast Office
26 Weather Lane
Sioux Falls, SD 57104-0198
(605) 330-4247
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:29 PM
Privacy Policy
About Us
Career Opportunities