Sun HUC8 10030104
A 4,863 km² sub-basin of the Missouri region in MT. 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
84
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 7 reporting
Median flow
148%
p79 of record
Water assets
1,562
7 springs · 158 wells
USGS gauges (7)
- North Fork Sun River near Augusta MT0607850099 cfsp47 · normal
- South Fork Sun River near Augusta MT0607900089 cfsp49 · normal
- Muddy Creek at Vaughn MT0608850083 cfsp57 · normal
- Sun River at Simms MT06085800295 cfsp79 · above normal
- Sun River near Vaughn MT06089000506 cfsp80 · above normal
- Sun River bl Diversion Dam nr Augusta MT06080900209 cfsp80 · above normal
- Sun River bl Willow Cr nr Augusta MT06082200210 cfsp83 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-22 | 0 | 0 | 0/7 | p79 |
| 2026-10-21 | 0 | 0 | 0/7 | p79 |
| 2026-10-20 | 0 | 0 | 0/7 | p79 |
| 2026-10-19 | 0 | 0 | 0/7 | p79 |
| 2026-10-18 | 0 | 0 | 0/7 | p80 |
| 2026-10-17 | 0 | 0 | 0/7 | p81 |
| 2026-10-16 | 0 | 0 | 0/7 | p81 |
| 2026-10-15 | 0 | 0 | 0/7 | p82 |
| 2026-10-14 | 0 | 0 | 0/7 | p81 |
| 2026-10-13 | 0 | 0 | 0/7 | p82 |
| 2026-10-12 | 0 | 0 | 0/7 | p82 |
| 2026-10-11 | 0 | 0 | 0/7 | p81 |
| 2026-10-10 | 0 | 0 | 0/7 | p76 |
| 2026-10-09 | 0 | 0 | 0/7 | p76 |
Top water assets
- 69North Fork Sun Riverriver
- 69Wrong Creekriver
- 69Moudess Creekriver
- 69Red Butte Creekriver
- 69Fairview Creekriver
- 69Smith Creekriver
- 69Wood Creekriver
- 69Rock Creekriver
- 69South Fork Sun Riverriver
- 69Route Creekriver