Thompson River at Davis City, IA
River level and flood forecast · Decatur County
Normal2.0 ftas of Mon 2 PM
The river is 10.0 ft below flood stage (12 ft).
Flow: 402 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sat, Oct 3, 1:30 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 24 ft |
| Moderate flood stage | 20 ft |
| Flood stage | 12 ft |
| Action stage | 8 ft |
| Record crest (September 16, 1992) | 24.29 ft |
What floods at each level
From the National Weather Service, highest first.
- 24 ftWater affects both lanes of I-35 along with many area highways and county roads. Widespread flooding occurs along both the Thompson River and its tributaries.
- 19 ftWater affects the Hwy R15 bridge crossings just north of Grand River. Flooding occurs in the low areas of Davis City.
- 13 ftFlooding of agricultural land occurs north of Davis City near I-35.
- 12 ftWidespread flooding occurs at the Davis City park including the campgrounds. Water affects Hwy R15 just north of the town of Grand River in northwest Decatur County.
- 11 ftWater affects the Davis City park and campgrounds.
- 10 ftWater affects gravel roads from Shewmaker Park to Oakhill cemetery near the town of Grand River in northwest Decatur County.
- 9 ftWater affects the low areas of the Davis City park as well as some rural roads.
Highest crests on record
- 24.29 ft — September 16, 1992
- 23 ft — August 27, 1903
- 22.8 ft — August 8, 1885
- 22.3 ft — July 6, 1909
- 22.2 ft — August 16, 1914
Recent crests: 10.53 ft (June 24, 2025) · 6.63 ft (May 8, 2024) · 6.39 ft (February 27, 2023) · 6.99 ft (June 8, 2022) · 8.72 ft (July 10, 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 (DVSI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.