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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
65
Moderate
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
80%
of 5 reporting
Median flow
84%
p18 of record
Water assets
2,033
21 springs · 70 wells
USGS gauges (5)
- Boiling River at Mammoth,YNP0619054020 cfsp12 · below normal
- Lamar River nr Tower Ranger Station YNP06188000138 cfsp16 · below normal
- Gardner River near Mammoth, YNP06191000106 cfsp18 · below normal
- Soda Butte Cr at Park Bndry at Silver Gate061879158 cfsp22 · below normal
- Yellowstone River at Yellowstone Lk Outlet YNP06186500618 cfsp29 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 100 | 0 | 4/5 | p18 |
| 2026-10-19 | 100 | 0 | 3/5 | p23 |
| 2026-10-18 | 100 | 0 | 3/5 | p24 |
| 2026-10-17 | 100 | 0 | 1/5 | p29 |
| 2026-10-16 | 100 | 0 | 1/5 | p34 |
| 2026-10-15 | 100 | 0 | 1/5 | p37 |
| 2026-10-14 | 100 | 0 | 1/5 | p48 |
| 2026-10-13 | 100 | 0 | 1/5 | p50 |
| 2026-10-12 | 100 | 0 | 1/5 | p56 |
| 2026-10-11 | 100 | 0 | 2/5 | p27 |
| 2026-10-10 | 100 | 0 | 5/5 | p17 |
| 2026-10-09 | 100 | 0 | 5/5 | p16 |
| 2026-10-08 | 100 | 0 | 5/5 | p17 |
| 2026-10-07 | 100 | 0 | 5/5 | p16 |
Top water assets
- 69Lava Creekriver
- 69Soda Butte Creekriver
- 69Republic Creekriver
- 69Hellroaring Creekriver
- 69Lamar Riverriver
- 69Yellowstone Riverriver
- 69Slough Creekriver
- 69Little Lamar Riverriver
- 69Yellowstone Riverriver
- 69Calfee Creekriver