USGS Streamgage 06130000
Flatwillow Creek near Mosby, MT
Flatwillow Creek near Mosby, MT is USGS streamgage 06130000 in Montana, monitoring river discharge in hydrologic subbasin 10040203. It drains a watershed of about 1,855 square miles. Discharge records at this site go back to 1964. Typical flow runs near 49 cfs in July and 86.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,855 sq mi
- Gauge elevation
- 2,556 ft
- Subbasin (HUC-8)
- 10040203
- Coordinates
- 46.92866, -107.93284
- USGS site number
- 06130000
- Records begin
- 1964-03-01 (62 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 62 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 | 0.1 | 20.9 | 108.7 | |
| February | 0.1 | 34 | 418.7 | |
| March | 2.9 | 62.9 | 605.6 | |
| April | 4.4 | 86.8 | 397 | |
| May | 3.3 | 89.5 | 696.4 | |
| June | 1.4 | 56.4 | 1,394 | |
| July | 0 | 49 | 234.3 | |
| August | 0 | 12.9 | 869.4 | |
| September | 0 | 7.3 | 173.6 | |
| October | 0 | 8.5 | 273.5 | |
| November | 0 | 16.7 | 110 | |
| December | 0 | 16.9 | 96.9 |
All values in cubic feet per second (cfs).