Thompson River (IA/MO) near Trenton, MO
River level and flood forecast · Grundy County
Normal12.2 ftas of Mon 2:45 PM
The river is 14.8 ft below flood stage (27 ft).
Flow: 1,230 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 | 34 ft |
| Moderate flood stage | 31 ft |
| Flood stage | 27 ft |
| Action stage | 24 ft |
| Record crest (May 29, 2019) | 34.38 ft |
What floods at each level
From the National Weather Service, highest first.
- 45.9 ftWater overtops the Highway 6 bridge located one mile west of Trenton.
- 39 ftWater reaches the low-steel of the Highway 6 bridge located one mile west of Trenton.
- 31 ftSouthwest 30th Avenue floods a quarter mile south of Highway 6. In addition, backwater flooding along Muddy Creek begins to affect Morningsun Drive in southeast Trenton.
- 30 ftBackwater along the Weldon River causes flooding at Northwest 22nd Avenue and Route A north of Trenton.
- 28 ftLow lying areas north of the gage are flooded.
Highest crests on record
- 34.38 ft — May 29, 2019
- 32.84 ft — September 10, 2014
- 32.46 ft — July 25, 2008
- 32.33 ft — June 6, 2010
- 31.52 ft — April 19, 2013
Recent crests: 29.71 ft (June 11, 2026) · 27.32 ft (May 19, 2026) · 29.7 ft (May 17, 2026) · 28.4 ft (May 2, 2024) · 29.37 ft (August 5, 2023)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (TTZM7); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.