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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
80
Healthy
Drought index
43
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 7 reporting
Median flow
180%
p82 of record
Water assets
1,562
7 springs · 158 wells
USGS gauges (7)
- Sun River bl Diversion Dam nr Augusta MT06080900195 cfsp64 · normal
- Sun River bl Willow Cr nr Augusta MT06082200189 cfsp77 · above normal
- North Fork Sun River near Augusta MT06078500198 cfsp82 · above normal
- South Fork Sun River near Augusta MT06079000157 cfsp82 · above normal
- Muddy Creek at Vaughn MT06088500330 cfsp82 · above normal
- Sun River near Vaughn MT06089000885 cfsp85 · above normal
- Sun River at Simms MT06085800338 cfsp88 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 43 | 0 | 0/7 | p82 |
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