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River OH IN KY

Great Miami River

Ohio • 39.7583, -84.1917
Hydrography profile Updated Dec 26, 2025
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USGS and NOAA data is for informational purposes. Source notes
Length
160 mi
257 km
Elevation
990′ → 458′
532 ft drop
Stream Order
9
Major River
Slope
0.06%
3.3 ft/mi
Drainage
5,237 mi²
13,563 km²
Avg Flow
5,551 cfs
2.4 mph velocity
Path to Mouth
1,620 mi
2,607 km to ocean
Classification
Tributary
Mid-reach
Elevation Profile
Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

EPA WQP MyWaterway
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Data from USGS & NOAA for informational purposes only. Read source and safety notes
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Water Level Gauges on Great Miami River

There are 10 USGS water level monitoring stations on Great Miami River providing real-time flow and stage data.

Access Sites on Great Miami River

There are 50 boat ramps, launches, and public access points on Great Miami River.