Big HUC8 07140104
A 2,513 km² sub-basin of the Upper Mississippi region in MO. 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
43
Stressed
Drought index
208
Severe
Area in D2+
26.81%
0% exceptional (D4)
Gauges below normal
100%
of 5 reporting
Median flow
59%
p9 of record
Water assets
4,095
16 springs · 2,538 wells
USGS gauges (5)
- Big River below Bonne Terre, MO0701761020 cfsp6 · much below normal
- Big River below Desloge, MO0701726026 cfsp9 · much below normal
- Big River at Irondale, MO070172009 cfsp9 · much below normal
- Big River near Richwoods, MO0701810094 cfsp16 · below normal
- Big River at Byrnesville, MO07018500123 cfsp23 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 208 | 26.81 | 5/5 | p9 |
| 2026-10-20 | 208 | 26.81 | 4/5 | p10 |
| 2026-10-19 | 208 | 26.81 | 4/5 | p10 |
| 2026-10-18 | 208 | 26.81 | 4/5 | p18 |
| 2026-10-17 | 208 | 26.81 | 3/5 | p14 |
| 2026-10-16 | 208 | 26.81 | 3/5 | p22 |
| 2026-10-15 | 149 | 0 | 5/5 | p10 |
| 2026-10-14 | 149 | 0 | 4/5 | p9 |
| 2026-10-13 | 149 | 0 | 4/5 | p10 |
| 2026-10-12 | 149 | 0 | 4/5 | p11 |
| 2026-10-11 | 149 | 0 | 4/5 | p11 |
| 2026-10-10 | 149 | 0 | 4/5 | p10 |
| 2026-10-09 | 149 | 0 | 4/5 | p19 |
| 2026-10-08 | 149 | 0 | 4/5 | p19 |
Top water assets
- 67Council Bluff Damreservoir
- 67Eshbaugh-Martin Damreservoir
- 67St. Joe State Park Damreservoir
- 66Lac Shayne Damreservoir
- 66Cadet No. 1 Damreservoir
- 66Kingston No. 1 Damreservoir
- 66Lake Primrose Damreservoir
- 66Lac Marseilles Damreservoir
- 66Lac Darcie Damreservoir
- 66Wahoo Lake Damreservoir