Madison HUC8 10020007
A 6,619 km² sub-basin of the Missouri region in ID, MT, WY. 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
48
Stressed
Drought index
200
Severe
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 10 reporting
Median flow
79%
p13 of record
Water assets
1,557
149 springs · 251 wells
USGS gauges (12)
- Firehole River near West Yellowstone MT06036905187 cfsp9 · much below normal
- Madison River near West Yellowstone, MT06037500290 cfsp9 · much below normal
- Gibbon River at Madison Jct, YNP0603710073 cfsp10 · much below normal
- Madison River bl Hebgen Lake nr Grayling MT06038500760 cfsp10 · much below normal
- Madison River at Kirby Ranch nr Cameron MT06038800864 cfsp13 · below normal
- Madison River near Cameron MT06040000926 cfsp14 · below normal
- Firehole River at Old Faithful, YNP0603680536 cfsp15 · below normal
- Madison River bl Ennis Lake nr McAllister MT060410001,170 cfsp16 · below normal
- Tantalus Creek at Norris Junction, YNP060369403 cfsp19 · below normal
- Madison River ab powerplant nr McAllister MT06040800105 cfsp22 · below normal
- Madison River at Ennis, MT06040050863 cfsno long-term record
- Madison River near Norris MT060415001,170 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 200 | 0 | 10/10 | p13 |
Top water assets
- 69Madison River Near West Yellowstone, Mtriver
- 69Wolf Creekriver
- 69Madison River At Kirby Ranch Nr Cameron Mtriver
- 69Madison River Bl Hebgen Lake Nr Grayling Mtriver
- 69Firehole Riverriver
- 69Sun Creekriver
- 69Madison River Near Cameron Mtriver
- 69Tantalus Creek At Norris Junction, Ynpriver
- 69Gibbon River At Madison Jct, Ynpriver
- 69South Fork Indian Creekriver