Little Sioux River near Spencer / Highway 18

1. 1332.0 ftThe Hwy 18 bridge is overtopped as is the bridge on 190th Ave
2. 1330.0 ftWater reaches the bottom of the bridge on Hwy 18 at the gage location. Water nears the feedhorn of the automated sensor and thus river level data may be lost.
3. 1328.0 ftWater begins to approach the low spots of Hwy 18 and 200th Ave south of Hwy 18 begins to flood.
4. 1326.0 ft200th Ave north of Hwy 18 begins to flood.
5. 1322.5 ftMost banks begin to be overtopped and overspill into nearby agricultural land.
6. 1321.0 ftThe lowest banks begin to overflow.

Most recent crests

• August 19, 2025: 1320.2 ft
• June 22, 2024: 1328.2 ft
• May 15, 2023: 1322.6 ft
• March 10, 2020: 1323.4 ft
• March 18, 2019: 1325.5 ft
• June 25, 2018: 1326.6 ft

• UpstreamLittle Sioux River at Spencer
• DownstreamLittle Sioux River at Spencer
• Ocheyedan River at Spencer
• Ocheyedan River at Everly
• Little Sioux River at Milford
• Milford Creek at Lower Gar Lake Outlet
• West Okoboji Lake at Milford
• East Okoboji Lake at East/West Okoboji Lake Channel

Forecasts by the Missouri Basin River Forecast Center. Forecasts are not available. Only observed stages are available for this point. No forecasts are available for this location Gauge reading may be affected by ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.