Rivers in Iowa

Maple River at Mapleton

Monona County, IowaNWS MAPI4USGS 06607200Valley office

Below flood stage
4.69ftStage

Observed Sun, Sep 20, 10:00 AM CDT

Flood stage
21.00 ft
Record crest
24.70 ft1959

Open the live map with the river flood outlook

Flood stages and impacts

CategoryStage
Major flood23.00 ft
Moderate flood22.00 ft
Minor flood21.00 ft
Action19.00 ft
  1. 31.50 ftThough unlikely to occur, water reaches the bottom of the Highway 175 bridge at this level.
  2. 27.00 ftWidespread flooding envelopes the reach from just north of the airport downstream to the southwest of Mapleton. A levee protects the town of Mapleton.
  3. 24.00 ftHighway 175 just north of Mapleton as well as the airport experience much more widespread flooding.
  4. 22.00 ftWater affects Highway 175 near the airport just northwest of town.
  5. 21.00 ftWater begins to flow over the airstrip ramp at the city airport. Farmland, low lying roads, and the airport are generally the only areas affected.

Flood outlook

Chance of flooding, September to November

CategoryChance
Minor floodingUnder 5%
Moderate floodingUnder 5%
Major floodingUnder 5%

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 26, 2026.

Crest history

70 crests on NOAA’s list since 1957.

#DateStage
1May 31, 195924.70 ft
2March 14, 201923.60 ft
3March 30, 196022.90 ft
4June 21, 198321.84 ft
5September 12, 197821.74 ft
6March 28, 196221.05 ft
7June 8, 198420.51 ft
8June 4, 196320.50 ft
9May 28, 201320.43 ft
10May 25, 196420.36 ft
11February 19, 199720.32 ft
12February 19, 197120.17 ft
13June 15, 199119.99 ft
14June 21, 199619.66 ft
15May 7, 200718.96 ft
16March 20, 197918.76 ft
17June 17, 199018.76 ft
18April 27, 197518.17 ft
19June 9, 196717.98 ft
20June 17, 200417.91 ft
21April 1, 196517.14 ft
22July 28, 201516.27 ft
23March 18, 198615.85 ft
24July 6, 198215.84 ft
25June 9, 200815.81 ft

Most recent crests

  • July 30, 2025: 12.99 ft
  • May 8, 2024: 10.63 ft
  • February 15, 2023: 14.46 ft
  • June 2, 2022: 5.46 ft
  • March 5, 2021: 5.87 ft
  • February 18, 2020: 8.33 ft
  • March 14, 2019: 23.60 ft
  • June 21, 2018: 8.96 ft
  • August 21, 2017: 10.65 ft
  • May 1, 2016: 11.99 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.