Great Miami River at Sidney, OH
River level and flood forecast · Shelby County
Normal1.3 ftas of Mon 3:30 PM
The river is 8.7 ft below flood stage (10 ft).
Forecast to hold near 1.3 ft through Sat, Oct 17, 8 AM.
Flow: 165 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 10:22 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 18 ft |
| Moderate flood stage | 14.6 ft |
| Flood stage | 10 ft |
| Action stage | 8 ft |
| Record crest (March 25, 1913) | 19.6 ft |
What floods at each level
From the National Weather Service, highest first.
- 19.6 ftThis will reach the flood of record of 1913. Much of the City of Sidney would be inundated, as well as areas along the river through Shelby County. Hundreds of homes and businesses would be inundated.
- 18.54 ftThe river will breach city flood wall with the entire south end of the city flooded. Downstream in Miami County, major flooding occurs with numerous homes and businesses impacted.
- 18.02 ftThe river breaches the Jersey barriers on South Ohio Avenue in front of the Big Four Bridge. Flooding occurs along Crescent Drive, South Ohio and Brooklyn Avenue.
- 16 ftFlooding continues along Riverside Drive and Custenborder Field. In addition, flooding worsens along County Road 25A, near the cemetery, north to the Big Four Bridge. Downstream of Sidney, flooding worsens in Shelby County along the river.
- 14.6 ftThe river breaches the west bank on County Road 25A South. County Road 25A near the cemetery will flood north to under the Big Four Bridge where the Jersey barriers are located.
- 14 ftSeveral homes and businesses are impacted on the east side of Sidney, as well as Port Jefferson.
- 13 ftWater approaches properties along Canal Street in Port Jefferson, with flooding worsening in Custenborder Field in Sidney. Flooding impacts yards and parking lots along Riverside Drive. Flooding extends through much of Berger Park. Flooding encroaches to near mobile homes along Brooklyn Avenue on the east side of the Great Miami.
- 12 ftThe river breaches the bank on Riverside Drive, with flooding of Custenborder Field at the east river intake. Flooding of properties occurs along the river on Riverside Drive from the B and K Root Beer stand to the city limits.
- 11 ftCustenborder Field has some flooding of perimeter areas, along with flooding occurring in low spots on Miami River Road.
- 10 ftThe river approaches the bank on the west side of Custenborder Field. At stages above 10 feet, city officials begin flood operations.
Highest crests on record
- 19.6 ft — March 25, 1913
- 15.91 ft — January 21, 1959
- 15.61 ft — December 22, 2013
- 14.58 ft — July 13, 1992
- 14.4 ft — July 9, 2003
Recent crests: 11.04 ft (August 20, 2026) · 13.92 ft (April 5, 2025) · 12.74 ft (April 3, 2024) · 10.86 ft (March 4, 2023) · 10.35 ft (March 7, 2022)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SIDO1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.