Thornapple River
Barry / Eaton Co. · 90 mi · Class Riffles
2,070CFS/ 6.63 ft
Above Optimal
↓Falling slowly (-50 cfs/hr)· -90 cfs in 3h
Optimal: 300–1200 CFS · USGS #04117500
⚡Flow data is live from USGS·Rapid classifications and CFS ranges need community verification·Know this river?
90 mi
Length
Class Riffles
Difficulty
300–1200 cfs
Optimal
680 cfs
Avg Flow
620 cfs
Hist. Median
#04117500
USGS Gauge
None

Winding through southwest Michigan's rural farmland, the Thornapple offers good bass fishing and a peaceful, pastoral paddle to its confluence with the Grand River. A quiet alternative to busier northern LP rivers. The 90-mile river drifts through gentle meanders from Vermontville to Hastings before widening on the run into Grand Rapids.

Trip sections
Upper — Vermontville to Hastings, gentle meanders through farmland
Lower — Hastings to Grand Rapids, wider current to Grand River confluence
Outfitters
Thornapple River Livery
Canoe and kayak rentals in Hastings
72-Hour Flow Forecast
NOAA NWPS
Loading forecast...
10-Year Flow Patterns
See 10 years of flow patterns for this river — historical analysis is a Pro feature.Upgrade to Pro →
Your Optimal Range
Set your personal optimal CFS window per river — custom ranges are a Pro feature.Upgrade to Pro →
Data Quality

River conditions are community-verified. CFS ranges, difficulty ratings, and trip sections may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level. If you spot an error, use the Improve This River button at the top of the page — your local knowledge is what makes this atlas accurate.