Rivers in Iowa

East Nishnabotna River at Red Oak

Montgomery County, IowaNWS RDOI4USGS 06809500Valley office

Below flood stage
9.65ftStage

Observed Mon, Sep 28, 2:00 PM CDT

Flood stage
18.00 ft
Record crest
29.39 ft1998

Open the live map with the river flood outlook

Flood stages and impacts

CategoryStage
Major flood27.00 ft
Moderate flood22.00 ft
Minor flood18.00 ft
Action16.00 ft
  1. 37.00 ftWater begins to flow over the Coolbaugh Street bridge at the gage site.
  2. 36.00 ftWater nears the top of the federal levee protecting Red Oak.
  3. 30.00 ftWater approaches the bottom of the bridge at Coolbaugh Street.
  4. 29.50 ftThe airport begins to flood.
  5. 28.50 ftWest Coolbaugh Street begins to flood.
  6. 27.00 ft200th Street, also known as H34, begins to flood east of the airport.
  7. 25.00 ftHighway 34 west of Broadway Street begins to flood.
  8. 22.00 ftBuildings between G Avenue and the river begin to flood. Also G Avenue is likely closed due to flooding.
  9. 20.00 ftLowland flooding begins along the west bank.
  10. 18.00 ftRural lowlands begin to flood along the east bank.

Flood outlook

Chance of flooding, September to November

CategoryChance
Minor flooding40%
Moderate flooding14%
Major flooding6%

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 23, 2026.

Crest history

104 crests on NOAA’s list since 1917.

#DateStage
1June 15, 199829.39 ft
2June 13, 194728.23 ft
3September 13, 197227.43 ft
4July 3, 195827.27 ft
5June 7, 191726.30 ft
6May 7, 200726.24 ft
7May 23, 194525.50 ft
8March 14, 201924.61 ft
9March 2, 196524.40 ft
10June 13, 200824.09 ft
11March 19, 194823.90 ft
12March 4, 193723.60 ft
13July 20, 194223.40 ft
14August 12, 193923.20 ft
15February 6, 194623.20 ft
16February 4, 194322.90 ft
17August 2, 194422.90 ft
18June 26, 192422.80 ft
19March 5, 194922.70 ft
20June 15, 199122.25 ft
21August 31, 199321.98 ft
22May 1, 195121.97 ft
23December 14, 201521.81 ft
24September 9, 198921.74 ft
25March 30, 196021.40 ft

Most recent crests

  • June 26, 2025: 11.61 ft
  • May 22, 2024: 17.16 ft
  • February 27, 2023: 14.43 ft
  • June 16, 2022: 13.92 ft
  • July 11, 2021: 9.54 ft
  • February 18, 2020: 9.09 ft
  • March 14, 2019: 24.61 ft
  • July 1, 2018: 16.09 ft
  • May 20, 2017: 15.61 ft
  • May 27, 2016: 18.52 ft

Nearby

Upstream, downstream and the gauges around this one.

What this means

Forecasts by the Missouri Basin River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. 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. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time. Stage may be affected by ice.

Sources

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.