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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
75
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
108%
p42 of record
Water assets
565
0 springs · 207 wells
USGS gauges (3)
- QUAKER BROOK AT STATE HWY M-66 NEAR NASHVILLE, MI041170046 cfsp22 · below normal
- THORNAPPLE RIVER NEAR HASTINGS, MI04117500196 cfsp63 · normal
- THORNAPPLE RIVER NEAR CALEDONIA, MI04118000417 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 0 | 0 | 1/2 | p42 |
| 2026-10-19 | 0 | 0 | 0/2 | p61 |
| 2026-10-18 | 0 | 0 | 0/2 | p66 |
| 2026-10-17 | 0 | 0 | 0/2 | p74 |
| 2026-10-16 | 0 | 0 | 0/2 | p61 |
| 2026-10-15 | 0 | 0 | 0/2 | p48 |
| 2026-10-14 | 0 | 0 | 1/2 | p40 |
| 2026-10-13 | 0 | 0 | 0/2 | p47 |
| 2026-10-12 | 0 | 0 | 0/2 | p52 |
| 2026-10-11 | 0 | 0 | 0/2 | p58 |
| 2026-10-10 | 0 | 0 | 0/2 | p63 |
| 2026-10-09 | 0 | 0 | 0/2 | p60 |
| 2026-10-08 | 0 | 0 | 0/2 | p57 |
| 2026-10-07 | 0 | 0 | 0/2 | p61 |
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