Lower Tongue HUC8 10090102
A 7,439 km² sub-basin of the Missouri region in MT. 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
40
Stressed
Drought index
276
Severe
Area in D2+
61.36%
0% exceptional (D4)
Gauges below normal
100%
of 3 reporting
Median flow
30%
p13 of record
Water assets
2,860
314 springs · 869 wells
USGS gauges (4)
- Tongue R at Birney Day School Br nr Birney MT0630761696 cfsp5 · much below normal
- Tongue R bl Brandenberg bridge nr Ashland MT06307830149 cfsp13 · below normal
- Tongue River at Miles City, MT0630850029 cfsp14 · below normal
- Tongue River at Ashland, MT06307662108 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 276 | 61.36 | 3/3 | p13 |
Top water assets
- 67Home Creekriver
- 67Little Pumpkin Creekriver
- 67Tongue River At Ashland, Mtriver
- 67Tongue R At Birney Day School Br Nr Birney Mtriver
- 67Otter Creekriver
- 67Tongue River At Miles City, Mtriver
- 67Pumpkin Creekriver
- 67Tongue R Bl Brandenberg Bridge Nr Ashland Mtriver
- 67Beaver Creekriver
- 67Pumpkin Creekriver