USGS Streamgage 12323720
Willow Creek at Opportunity, MT
Willow Creek at Opportunity, MT is USGS streamgage 12323720 in Montana, monitoring river discharge in hydrologic subbasin 17010201. It drains a watershed of about 29 square miles. Discharge records at this site go back to 2003. Typical flow runs near 10.2 cfs in July and 9.2 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 29 sq mi
- Gauge elevation
- 4,930 ft
- Subbasin (HUC-8)
- 17010201
- Coordinates
- 46.10716, -112.81061
- USGS site number
- 12323720
- Records begin
- 2003-04-01 (23 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 23 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 | 3.3 | 4.6 | 6.6 | |
| February | 3.4 | 4.9 | 7.8 | |
| March | 4.4 | 6.3 | 10.9 | |
| April | 5.2 | 9.2 | 18.3 | |
| May | 8.1 | 22.4 | 51.6 | |
| June | 11.3 | 22.5 | 57.7 | |
| July | 6.5 | 10.2 | 19.5 | |
| August | 4.6 | 6.9 | 12.6 | |
| September | 3.7 | 6.6 | 10.5 | |
| October | 4.4 | 6.7 | 9.5 | |
| November | 4.3 | 6.2 | 8.8 | |
| December | 4.2 | 5.3 | 7.1 |
All values in cubic feet per second (cfs).