River stage
Hamilton, Great Miami River
- River level
- 63.18 ft
- Status
- Below flood stage
- 7-day change
- -0.21 ft
- Recent high
- 68.98 ft
- Recent low
- 62.88 ft
Last reported 2026-10-13 | NWS HAMO1
- 30-day change
- -0.24 ft
- Average
- 63.97 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 79.20 ft
In brief
The Great Miami River at Hamilton, OH read 63.18 ft on Oct 13, 2026, 9.82 ft below action stage. That is 0.24 ft lower than 30 days earlier.
Source: National Weather Service gauge HAMO1
Water 67 °F (20 °C) · +2 °F in 24 hours
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 79.20 ft | 1959-01-21 |
| 2 | 76.60 ft | 1943-03-19 |
| 3 | 76.50 ft | 1929-02-26 |
| 4 | 76.33 ft | 1937-01-22 |
| 5 | 75.95 ft | 1952-01-27 |
| 6 | 75.84 ft | 2004-01-05 |
| 7 | 75.57 ft | 2005-01-06 |
| 8 | 75.41 ft | 1968-05-24 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 74.00 ft
Lowland flooding begins about one mile north of High Street in Hamilton and near Ross, about five miles downstream. Low-lying homes near New Miami and other low-lying areas along the river channel are impacted. The City of Hamilton itself is protected from river levels up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet.
- 75.00 ft
Lowland areas south of Hamilton to Ross continue to flood. Evacuations are possible near New Miami and near Ross. The City of Hamilton itself is protected from river levels up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet.
- 77.00 ft
Locations along the river mainly south of the City of Hamilton become flooded. Flooding continues to impact New Miami and Ross. Southern portions of the City of Hamilton are protected by flood walls up to 89 feet, with the majority of the city protected up to a stage of 90 feet.
- 82.00 ft
Lowland areas in southern Butler County between State Route 128 and the Great Miami River become flooded. Flooding also occurs along the river near Ross. The City of Hamilton itself is protected from river levels up to 89 feet in the southern sections of the city, while most of the city is protected up to 90 feet.
- 84.00 ft
Flooding worsens in lowland areas in southern Butler County between State Route 128 and the Great Miami River. Flooding also worsens along the river near Ross. The City of Hamilton itself is protected from river flooding up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet.
- 89.00 ft
This elevation is at the top of some levees protecting mainly the southern areas of Hamilton. In addition to major inundation of communities such as New Miami and near Ross, river stages above this level would inundate some areas of Hamilton south of Pershing Avenue along and near Neilan Boulevard. Widespread inundation occurs near Joyce Park and Joe Nuxhall Lane.
- 90.00 ft
Water would overtop levees on the south side of Hamilton. Water levels exceeding 90 feet would top all levees protecting the business district resulting in major flooding near the river channel through the entire city. Major flooding occurs, especially near New Miami and Ross, where homes and businesses along the river are suffering major inundation.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Great Miami River flooding at Hamilton?
No. The Great Miami River at Hamilton is at 63.18 ft, 9.82 ft below action stage.
What is the flood stage at Hamilton?
The National Weather Service sets action stage 73 ft, minor flooding 75 ft, moderate flooding 82 ft and major flooding 89.5 ft.
What is the highest the Great Miami River has been at Hamilton?
The highest crest on record is 79.2 ft, on 1959-01-21.
Is the Great Miami River high or low right now at Hamilton?
At 63.18 ft it is higher than 19% of readings over the last 122 days.
How warm is the water at Hamilton, Great Miami River?
The water temperature at Hamilton, Great Miami River is 67 °F (19.6 °C), measured 7:00 pm by USGS. It has risen 2.2 °F in the last 24 hours.
Stage and flood information from the NOAA National Weather Service (gauge HAMO1); daily history from the U.S. Geological Survey (site 03274000). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.