Floyd River at Alton

Last updated: Jul 20, 2025, 3:58 AM UTC
No watches, warnings or advisories are in effect for this area.

Flood Impacts 🅘

  • 26 - Hwy 10 is flooded and substantial flooding is ongoing near the river throughout Alton.
  • 24 - Several houses on the north side of Alton flood. Hwy 60 south of Alton floods and water approaches Hwy 10 on the north side of Alton. The railroad tracks are also flooded.
  • 22 - More substantial street flooding begins in Alton including 3rd Ave south of the bridge. Additional structures are also in danger of flooding.
  • 20 - The lower levees in Alton may begin to be overtopped flooding some nearby industrial businesses. Portions of Division St may also begin to flood. The bridge on 3rd Ave may also be closed.
  • 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.

Gauge Info

Coordinates 42.9819, -96.0008
RFC MBRFC
State IA
WFO FSD
County Sioux
Data Provider(s)
USGS 06600100
USACE Website

Gauge Location

Recent Crests

1. 26.81 ft on 06-22-2024
2. 9.09 ft on 05-13-2023
3. 6.43 ft on 06-25-2022
4. 6.16 ft on 07-14-2021
5. 8.82 ft on 05-27-2020

Historic Crests

1. 26.81 ft on 06-22-2024
2. 21.96 ft on 09-20-2018
3. 20.87 ft on 03-14-2019
4. 20.50 ft on 06-21-2018
5. 19.19 ft on 05-27-2013

Vertical Datum Table

type NAVD88
major Flooding 1292.17 ft
moderate Flooding 1286.17 ft
minor Flooding 1282.17 ft
action 1280.17 ft
Latest Value 1276.33 ft
Gauge Zero 1270.17 ft

Gauge Photos

Photo 1 of 2

Downstream View (May 22, 2024)

Probability Information

Photo 1 of 3

Unique Local Info

USGS 7-Day Streamflow Historical Comparison USGS WaterWatch Webpage

Collaborative Agencies

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.

WFO Information

Weather Forecast Office
Sioux Falls
26 Weather Lane
Sioux Falls, SD 57104-0198
Official Homepage