USGS Streamgage 12377150
Mission Creek ab reservoir near St. Ignatius, MT
Mission Creek ab reservoir near St. Ignatius, MT is USGS streamgage 12377150 in Montana, monitoring river discharge in hydrologic subbasin 17010212. It drains a watershed of about 14 square miles. Discharge records at this site go back to 1982. Typical flow runs near 110.9 cfs in July and 20.1 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Montana
- Drainage area
- 14 sq mi
- Gauge elevation
- 3,415 ft
- Subbasin (HUC-8)
- 17010212
- Coordinates
- 47.32019, -113.98789
- USGS site number
- 12377150
- Records begin
- 1982-10-01 (44 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Mission Creek ab reservoir near St. Ignatius, MT. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 36.4 | 42 | 51.9 | ||
| 29.4 | 38.2 | 49.7 | ||
| 27.7 | 36.6 | 48 | ||
| 25.7 | 34.6 | 45.2 | ||
| 24.4 | 32.6 | 42.6 | ||
| 23.1 | 31.8 | 42.5 | ||
| 21.9 | 30.3 | 40.6 | ||
| 20 | 28.1 | 37.8 | ||
| 19.3 | 26.7 | 36 | ||
| 19 | 25.9 | 34.7 | ||
| 18.3 | 25 | 33.8 | ||
| 17.7 | 24.5 | 33.4 | ||
| 17 | 23.6 | 32.4 | ||
| 16.4 | 22.9 | 31.7 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 43 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 | 8.2 | 10.7 | 14.5 | |
| February | 7.2 | 9.4 | 13.2 | |
| March | 7.9 | 10.2 | 14.7 | |
| April | 10.4 | 20.1 | 44.8 | |
| May | 43.8 | 86.3 | 202.6 | |
| June | 104.4 | 173 | 306 | |
| July | 62.1 | 110.9 | 194.3 | |
| August | 29.5 | 45.7 | 74.9 | |
| September | 18 | 26.5 | 46.8 | |
| October | 14.6 | 22.5 | 37 | |
| November | 13 | 19.5 | 30.4 | |
| December | 10.1 | 13.4 | 18.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Mission Creek ab reservoir near St. Ignatius, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 173 cfs, against 9.4 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Mission Creek ab reservoir near St. Ignatius, MT?
- It depends on the month. In January, half of days historically fall near 10.7 cfs, with the middle 80% of days between 8.2 and 14.5 cfs. The month-by-month table on this page gives the full range.
- How long has Mission Creek ab reservoir near St. Ignatius, MT been measured?
- Discharge records at USGS site 12377150 begin in 1982, about 44 years, covering roughly 9,201 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Mission Creek ab reservoir near St. Ignatius, MT?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is Mission Creek ab reservoir near St. Ignatius, MT?
- The gauge sits at 47.32019, -113.98789, in Montana, in hydrologic subbasin 17010212, at an elevation of about 3,415 feet, draining roughly 14 square miles.
- Can I use Mission Creek ab reservoir near St. Ignatius, MT data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.