Great Miami River At Dayton flow report
As of July 13, 2026, Great Miami River At Dayton is flowing at 1,320 cfs with a gage height of 24.83 ft, receding 38% over the past 24 hours. Source: USGS gauge #03270500, refreshed throughout the day.
Historical Data
Great Miami River At Dayton at a glance
How Great Miami River At Dayton is running right now, where it sits on the map, and the key gauge stats.
Great Miami River At Dayton is flowing at 1,320 cfs, with the water sitting 24.83 ft at the gage. Flow is down 38% since yesterday as the gauge recedes.
This is USGS gauge #03270500 in Ohio. Over the past 10 days the average has been 1,176 cfs, peaking at 2,130 cfs.
Over the next 5 days, Great Miami River At Dayton Oh is expected to recede from today's 1320 cfs, toward roughly 1077 cfs by 2026-07-18 (likely range 450-2580 cfs) -- drier than normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Ohio flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Great Miami River At Dayton
The river is influenced by various constituents such as rainfall, snowmelt, and runoff from urban and agricultural areas. Potential tributaries that contribute to the river flow include Stillwater River, Mad River, and Twin Creek. There are also several dams along the river that can affect water flow. Seasonal trends show that the river is typically higher in the spring due to snowmelt and rainfall, while lower in the summer and fall. Interesting facts about the hydrology of the Great Miami River include its designation as a National Water Trail and the presence of rare and endangered species such as the Eastern Hellbender salamander.
Nearby streamflow levels
Cross-check Great Miami River At Dayton's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Great Miami River At Dayton Oh | 1,320 cfs |
| Wolf Creek At Dayton Oh | 31 cfs |
| Mad River Near Dayton Oh | 483 cfs |
| Holes Creek Near Kettering Oh | 14 cfs |
| Great Miami River At Taylorsville Oh | 679 cfs |
| Stillwater River At Englewood Oh | 474 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Great Miami River At Dayton. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| New Lebanon 0.6 Sse | 0 in |
| Farmersville 1.7 E | 0 in |
| Wfo Wilmington | 0 in |
| Cheviot 3w | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Great Miami River At Dayton.
Boat launches
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River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Great Miami River At Dayton in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Great Miami River At Dayton crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Great Miami River At Dayton
Where does the streamflow data for Great Miami River At Dayton come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 03270500. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Great Miami River At Dayton rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free Great Miami River At Dayton report
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