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Flatrock River in Indiana

River62.1 mi

Around here

Around Flatrock River

10 mi

Data Source: Recreation.gov · Public land: USGS PAD-US

About this river

Flatrock River is a 62.1 mile river. Streamflow is measured at the USGS gauge Flatrock River at ST. Paul, IN (site 03363500). The National Hydrography Dataset places it at stream order 9. Reach geometry comes from the USGS National Hydrography Dataset.

Typical flow by month

1931 to 2025

Flatrock River typically runs highest in March, at a median 374 cfs, and lowest in September, at 20 cfs. The highest flow on record for any single day is 16,500 cfs, in 1949.

Show the numbers
Typical flow by month at Flatrock River at ST. Paul, IN, in cfs
MonthTypical (cfs)Usual range (cfs)
January226118 to 503
February288164 to 563
March374207 to 700
April340207 to 640
May255157 to 488
June17088 to 335
July8544 to 190
August4120 to 73
September2011 to 54
October2613 to 82
November7430 to 203
December15362 to 400

Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 95 years of record. Statistics published by the US Geological Survey for Flatrock River at ST. Paul, IN (site 03363500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.

Boat access nearby

3 mapped launches sit in the mapped area of Flatrock River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.

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