Yellowstone Headwaters HUC8 10070001
A 6,715 km² sub-basin of the Missouri region in 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
64
Moderate
Drought index
200
Severe
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
50%
of 4 reporting
Median flow
86%
p27 of record
Water assets
2,033
21 springs · 70 wells
USGS gauges (5)
- Gardner River near Mammoth, YNP06191000106 cfsp14 · below normal
- Yellowstone River at Yellowstone Lk Outlet YNP06186500988 cfsp23 · below normal
- Boiling River at Mammoth,YNP0619054022 cfsp30 · normal
- Lamar River nr Tower Ranger Station YNP06188000177 cfsp38 · normal
- Soda Butte Cr at Park Bndry at Silver Gate06187915no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 200 | 0 | 2/4 | p27 |
Top water assets
- 69Lava Creekriver
- 69Soda Butte Creekriver
- 69Republic Creekriver
- 69Hellroaring Creekriver
- 69Lamar Riverriver
- 69Slough Creekriver
- 69Little Lamar Riverriver
- 69Yellowstone Riverriver
- 69Slough Creekriver
- 69Calfee Creekriver