Sun River at Simms Mount
USGS Site No: 06085800 • Sun River • Cascade County, MT
Sun River at Simms Mount on the Sun River is currently at 3,140 cfs (Very High — 164th percentile for this date) . Gage height: 5.18 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 145 | |
| 25th | Low threshold | 165 | |
| 50th (Median) | Normal (median) | 193 | |
| 75th | High threshold | 240 | |
| 95th | Very High threshold | 400 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 2,470 | — |
| May 27, 2026 | 1,520 | — |
| May 26, 2026 | 1,020 | — |
| May 25, 2026 | 651 | — |
| May 24, 2026 | 466 | — |
| May 23, 2026 | 783 | — |
| May 22, 2026 | 896 | — |
| May 21, 2026 | 954 | — |
| May 20, 2026 | 1,020 | — |
| May 19, 2026 | 1,160 | — |
| May 18, 2026 | 1,390 | — |
| May 17, 2026 | 817 | — |
| May 16, 2026 | 921 | — |
| May 15, 2026 | 2,200 | — |
| Apr 20, 2026 | 955 | — |
| Apr 19, 2026 | 944 | — |
| Apr 18, 2026 | 1,160 | — |
| Apr 17, 2026 | 1,350 | — |
| Apr 16, 2026 | 1,420 | — |
| Apr 15, 2026 | 1,450 | — |
| Apr 14, 2026 | 1,490 | — |
| Apr 13, 2026 | 1,400 | — |
| Apr 12, 2026 | 1,150 | — |
| Apr 11, 2026 | 1,020 | — |
| Apr 10, 2026 | 1,010 | — |
| Apr 9, 2026 | 974 | — |
| Apr 8, 2026 | 934 | — |
| Apr 7, 2026 | 927 | — |
| Apr 6, 2026 | 1,020 | — |
| Apr 5, 2026 | 1,040 | — |
Station Information
- USGS Site No
- 06085800
- State
- MT
- County
- Cascade County
- Coordinates
- 47.5016, -111.9319
- Drainage Area
- 1,296 mi²
- Datum (ft)
- 3,551.1
- HUC Code
- 10030104
Flood Stage Thresholds
- Action Stage
- 6.0 ft
- Flood Stage
- 7.5 ft
- Moderate Flood
- 8.5 ft
- Major Flood
- 10.5 ft
Currently 2.32 ft below flood stage.
Recent Extremes
- Max discharge
-
2,470 cfsMay 28, 2026
- Min discharge
-
60 cfsAug 14, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Muddy Creek at Vaughn MountVery High18.7 mi · 174 cfs
-
Missouri River at Cascade MountNormal19.5 mi · 3,800 cfs
-
Sun River Near Vaughn MountVery High19.7 mi · 2,900 cfs
-
Sun River below Willow Creek near Augusta MountVery High20.6 mi · 3,700 cfs
-
Dearborn River Near Craig MountVery High22.3 mi · 306 cfs