Thornapple River near U-Rent-Em Canoe Livery

Thornapple River typically runs highest in March, at a median 530 cfs, and lowest in September, at 117 cfs. The highest flow on record for any single day is 6,590 cfs, in 1947.

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 82 years of record. Statistics published by the US Geological Survey for Thornapple River near Hastings, MI (site 04117500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.