USGS Streamgage 06085800
Sun River at Simms, MT
Sun River at Simms, MT is USGS streamgage 06085800 in Montana, monitoring river discharge in hydrologic subbasin 10030104. It drains a watershed of about 1,296 square miles. Discharge records at this site go back to 1964. Typical flow runs near 141.8 cfs in July and 209.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,296 sq mi
- Gauge elevation
- 3,555 ft
- Subbasin (HUC-8)
- 10030104
- Coordinates
- 47.50163, -111.93191
- USGS site number
- 06085800
- Records begin
- 1964-06-09 (62 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 60 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 109.3 | 183.8 | 315.2 | |
| February | 108.6 | 195.6 | 304.3 | |
| March | 108.7 | 186.1 | 392.9 | |
| April | 91.5 | 209.9 | 675.3 | |
| May | 81.2 | 781.6 | 2,855.5 | |
| June | 113.7 | 1,152.8 | 4,591.7 | |
| July | 55.1 | 141.8 | 887.3 | |
| August | 52.8 | 125.9 | 284.5 | |
| September | 59.6 | 130.6 | 235.6 | |
| October | 117.8 | 186.4 | 298.9 | |
| November | 131.8 | 199.2 | 342.4 | |
| December | 97.4 | 179 | 312.9 |
All values in cubic feet per second (cfs).