Major Flood
18 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
15 ft
Minor Flood
13 ft
Action Stage
10 ft
What Floods at Each Level
20 ft
Water floods several homes and businesses in the north and east sides of Rockford, primarily in the area of Bridge Street, as well as near East Street and locations along Route 33 east of town. High water extends further onto Route 118 north of Rockford near Route 117 and Route 127 at the St. Marys Bridge is closed.
16 ft
Water begins to flood some structures, primarily in the area of Route 33 and West Street, as well as near Route 33 and East Street on the southeast side of Rockford. In addition, Route 117 near Route 118 north of Rockford and Route 127 at the St. Marys Bridge are closed.
15 ft
Water nearly floods several homes and businesses, primarily in the area of Route 33 and West Street, as well as near Route 33 and East Street on the southeast side of Rockford. In addition, Route 117 near Route 118 north of Rockford and Route 127 at the St. Marys Bridge are closed.
14.7 ft
This stage is roughly the height of the FEMA 1 percent flood level. Backwater creek flooding rises onto property between West Bridge Street and North Streets.
14 ft
Several roads become flooded, with Route 127 at the St. Marys bridge closed due to high water. Water extends well onto property along the river, approaching some homes and businesses. No homes are flooded at this level.
13 ft
State Route 117 near Route 118 north of Rockford is water-covered and closed.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 17, 2015 | 14.68 ft | 8,633 cfs |
| Feb 8, 2008 | 14.56 ft | — |
| Mar 2, 2011 | 14.25 ft | 8,153 cfs |
About This Gauge
USGS Site
NWS LID
RFDO1
River
St. Marys River
County
Mercer, OH
Coordinates
40.6947°N, 84.6467°W
Get Flood Alerts for St. Marys River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of St. Marys River at Rockford?
The St. Marys River at Rockford gauge is maintained by USGS (site 04180988) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for St. Marys River at Rockford?
The NWS-defined flood stage for St. Marys River at Rockford is 13 feet. Action stage begins at 10 feet. Moderate flooding starts at 15 feet, and major flooding at 18 feet.
How do I get alerts when St. Marys River rises?
Download StormCast free on Google Play, go to River Gauges, and add St. Marys River at Rockford to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the St. Marys River at Rockford gauge located?
The gauge is located in Mercer County, Ohio at coordinates 40.6947°N, 84.6467°W. USGS site number: 04180988. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Downstream: St. Marys River at Willshire
More Resources
Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey
- Stage may be affected by ice.
- River Forecasts typically include ONLY 2 days of future rain from <u>forecast issuance time</u> (lower right of graph). Occasionally 3 days of future rain included.