Thornapple HUC8 04050007
A 2,199 km² sub-basin of the Great Lakes region in MI. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
74
Moderate
Drought index
30
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
331%
p88 of record
Water assets
565
0 springs · 207 wells
USGS gauges (3)
- QUAKER BROOK AT STATE HWY M-66 NEAR NASHVILLE, MI041170049 cfsp83 · above normal
- THORNAPPLE RIVER NEAR HASTINGS, MI04117500521 cfsp93 · much above normal
- THORNAPPLE RIVER NEAR CALEDONIA, MI04118000417 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 30 | 0 | 0/2 | p88 |
Top water assets
- 66Cascadereservoir
- 65Aurohn Lake Damreservoir
- 65Thornapple River Near Caledonia, Miriver
- 65Middlevillereservoir
- 65Thornapple River Near Hastings, Miriver
- 65Nashville Damreservoir
- 65Topski Damreservoir
- 65Dills Damreservoir
- 65Quaker Brook At State Hwy M-66 Near Nashville, Miriver
- 65Albion Damreservoir