Maple River at Mapleton, IA
River level and flood forecast · Monona County
Normal5.1 ftas of Mon 1 PM
The river is 15.9 ft below flood stage (21 ft).
Flow: 294 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 23 ft |
| Moderate flood stage | 22 ft |
| Flood stage | 21 ft |
| Action stage | 19 ft |
| Record crest (May 31, 1959) | 24.7 ft |
What floods at each level
From the National Weather Service, highest first.
- 31.5 ftThough unlikely to occur, water reaches the bottom of the Highway 175 bridge at this level.
- 27 ftWidespread flooding envelopes the reach from just north of the airport downstream to the southwest of Mapleton. A levee protects the town of Mapleton.
- 24 ftHighway 175 just north of Mapleton as well as the airport experience much more widespread flooding.
- 22 ftWater affects Highway 175 near the airport just northwest of town.
- 21 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.
Highest crests on record
- 24.7 ft — May 31, 1959
- 23.6 ft — March 14, 2019
- 22.9 ft — March 30, 1960
- 21.84 ft — June 21, 1983
- 21.74 ft — September 12, 1978
Recent crests: 12.99 ft (July 30, 2025) · 10.63 ft (May 8, 2024) · 14.46 ft (February 15, 2023) · 5.46 ft (June 2, 2022) · 5.87 ft (March 5, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MAPI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.