Little Bighorn HUC8 10080016
A 3,359 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
53
Moderate
Drought index
272
Severe
Area in D2+
71.92%
0% exceptional (D4)
Gauges below normal
50%
of 4 reporting
Median flow
80%
p23 of record
Water assets
1,501
2 springs · 409 wells
USGS gauges (6)
- Little Bighorn River near Hardin MT0629400074 cfsp7 · much below normal
- Little Bighorn River at State Line nr Wyola MT0628900071 cfsp20 · below normal
- Little Bighorn River nr Crow Agency MT06293500113 cfsp26 · normal
- Agency Canal Tailwaste near Hardin MT062938903 cfsp71 · normal
- Little Bighorn R bl Pass Cr nr Wyola MT0629050088 cfsno long-term record
- Lodge Grass Cr ab Willow Cr diversion, nr Wyola MT0629150021 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 272 | 71.92 | 2/4 | p23 |
| 2026-10-20 | 272 | 71.92 | 2/4 | p24 |
| 2026-10-19 | 272 | 71.92 | 2/4 | p23 |
| 2026-10-18 | 272 | 71.92 | 2/4 | p25 |
| 2026-10-17 | 272 | 71.92 | 3/4 | p23 |
| 2026-10-16 | 272 | 71.92 | 2/4 | p18 |
| 2026-10-15 | 289 | 89.42 | 2/4 | p28 |
| 2026-10-14 | 289 | 89.42 | 1/4 | p36 |
| 2026-10-13 | 289 | 89.42 | 1/4 | p26 |
| 2026-10-12 | 289 | 89.42 | 2/4 | p39 |
| 2026-10-11 | 289 | 89.42 | 3/4 | p13 |
| 2026-10-10 | 289 | 89.42 | 3/4 | p10 |
| 2026-10-09 | 289 | 89.42 | 3/4 | p10 |
| 2026-10-08 | 265 | 64.52 | 3/4 | p12 |
Top water assets
- 69Wagon Box Creekriver
- 69West Fork East Pass Creekriver
- 69Little Bighorn Riverriver
- 69West Fork East Pass Creekriver
- 69Bear Trap Creekriver
- 69Little Bighorn Riverriver
- 69Little Bighorn Riverriver
- 69Dry Fork Little Bighorn Riverriver
- 69Lodge Grass Creekriver
- 69Dry Fork Little Bighorn Riverriver