Boone River near Webster City, IA
River level and flood forecast · Hamilton County
Normal3.3 ftas of Mon 2 PM
The river is 10.8 ft below flood stage (14 ft).
Flow: 559 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 | 19 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 14 ft |
| Action stage | 9 ft |
| Record crest (June 10, 1918) | 19.1 ft |
What floods at each level
From the National Weather Service, highest first.
- 18 ftFlooding occurs west of the river to Union St and east to Elm St.
- 16 ftFlooding occurs along both river banks in the east part of town.
- 14 ftWater affects some residential areas near the river in Webster City.
- 12 ftWidespread agricultural land flooding occurs.
- 11 ftWater affects low-lying areas in close proximity to the river.
- 10.5 ftWater crosses the city walking path just south of the 2nd St bridge and also over the walkway just north of the Bank St bridge.
Highest crests on record
- 19.1 ft — June 10, 1918
- 18.55 ft — June 22, 1954
- 18.17 ft — June 28, 2010
- 17.74 ft — June 10, 2008
- 16 ft — June 18, 1932
Recent crests: 9.06 ft (July 21, 2025) · 10.2 ft (May 24, 2024) · 8.44 ft (February 27, 2023) · 6.04 ft (June 17, 2022) · 4.37 ft (May 23, 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 (WBCI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.