Shiawassee HUC8 04080203
A 3,278 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
79
Healthy
Drought index
99
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
89%
p42 of record
Water assets
618
0 springs · 107 wells
USGS gauges (3)
- SHIAWASSEE RIVER AT OWOSSO, MI0414450099 cfsp33 · normal
- SHIAWASSEE RIVER NEAR FERGUS, MI04145000146 cfsp51 · normal
- SWAN CREEK AT FROST ROAD NEAR FROST, MI041457853 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 99 | 0 | 0/2 | p42 |
| 2026-10-19 | 99 | 0 | 0/2 | p50 |
| 2026-10-18 | 99 | 0 | 0/2 | p55 |
| 2026-10-17 | 99 | 0 | 0/2 | p56 |
| 2026-10-16 | 99 | 0 | 0/2 | p51 |
| 2026-10-15 | 99 | 0 | 0/2 | p43 |
| 2026-10-14 | 99 | 0 | 0/2 | p49 |
| 2026-10-13 | 99 | 0 | 0/2 | p51 |
| 2026-10-12 | 99 | 0 | 0/2 | p56 |
| 2026-10-11 | 99 | 0 | 0/2 | p64 |
| 2026-10-10 | 99 | 0 | 0/2 | p69 |
| 2026-10-09 | 99 | 0 | 0/2 | p70 |
| 2026-10-08 | 121 | 0 | 0/2 | p74 |
| 2026-10-07 | 121 | 0 | 0/2 | p79 |
Top water assets
- 65Knoblock Lake Damreservoir
- 65Pool Fivereservoir
- 65Gratiot-Saginaw Sga Impoundment #1 Damreservoir
- 65Swan Creek At Frost Road Near Frost, Miriver
- 65Corunna Damreservoir
- 65Shiawassee River Near Fergus, Miriver
- 65Davisburg Trout Pond Damreservoir
- 65Holly Drainriver
- 65Shiawassee River At Owosso, Miriver
- 65Fenton Water Damreservoir