River stage
Sumner, Grand River
- River level
- 10.00 ft
- Status
- Below flood stage
- 7-day change
- -5.50 ft
- Recent high
- 36.86 ft
- Recent low
- 6.78 ft
Last reported 2026-10-13 | NWS SNZM7
- 30-day change
- +2.28 ft
- Average
- 11.98 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 42.52 ft
In brief
The Grand River at Sumner, MO read 10.00 ft on Oct 13, 2026, 11.00 ft below action stage. That is 2.28 ft higher than 30 days earlier.
Source: National Weather Service gauge SNZM7
Water 73 °F (23 °C)
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 42.52 ft | 1993-07-10 |
| 2 | 41.35 ft | 2019-05-30 |
| 3 | 40.02 ft | 2008-06-28 |
| 4 | 39.97 ft | 2007-05-10 |
| 5 | 39.57 ft | 2002-05-13 |
| 6 | 39.50 ft | 1947-06-08 |
| 7 | 39.20 ft | 2008-09-15 |
| 8 | 39.15 ft | 1996-05-29 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 23.00 ft
Bottomland 1 to 2 miles south of the gage begins to flood.
- 26.00 ft
Rural land adjacent to the river is flooded.
- 28.00 ft
Rural roads are under water.
- 37.00 ft
State Highway 139 floods a half mile east of Sumner.
- 40.00 ft
Homes in northeast Sumner begin to flood.
- 44.00 ft
Water reaches the bottom of the Burlington Northern Railroad bridge which is located just upstream from the State Highway 139 bridge.
- 45.00 ft
Water reaches the bottom of State Highway 139 bridge.
- 52.00 ft
Water reaches the road surface of State Highway 139 bridge.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Grand River flooding at Sumner?
No. The Grand River at Sumner is at 10.0 ft, 11.0 ft below action stage.
What is the flood stage at Sumner?
The National Weather Service sets action stage 21 ft, minor flooding 26 ft, moderate flooding 28 ft and major flooding 40 ft.
What is the highest the Grand River has been at Sumner?
The highest crest on record is 42.52 ft, on 1993-07-10.
Is the Grand River high or low right now at Sumner?
At 10.0 ft it is higher than 52% of readings over the last 122 days.
How warm is the water at Sumner, Grand River?
The water temperature at Sumner, Grand River is 73 °F (22.7 °C), measured 7:15 pm by USGS. It has risen 0.9 °F in the last 24 hours.
Stage and flood information from the NOAA National Weather Service (gauge SNZM7); daily history from the U.S. Geological Survey (site 06902000). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.