USGS Streamgage 06139800
West Fork Beaver Creek near Rocky Boy, MT
West Fork Beaver Creek near Rocky Boy, MT is USGS streamgage 06139800 in Montana, monitoring river discharge in hydrologic subbasin 10050004. It drains a watershed of about 3 square miles. Discharge records at this site go back to 2001. Typical flow runs near 2.8 cfs in July and 2.5 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
- 3 sq mi
- Gauge elevation
- 4,650 ft
- Subbasin (HUC-8)
- 10050004
- Coordinates
- 48.17615, -109.64213
- USGS site number
- 06139800
- Records begin
- 2001-09-01 (25 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for West Fork Beaver Creek near Rocky Boy, 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 |
|---|---|---|---|---|
| 2.1 | 2.5 | 3.5 | ||
| 2.1 | 2.6 | 4.2 | ||
| 1.8 | 2.3 | 3.3 | ||
| 1.8 | 2.2 | 3.2 | ||
| 1.7 | 2.1 | 2.9 | ||
| 1.9 | 2.5 | 5.1 | ||
| 1.7 | 2.2 | 3.4 | ||
| 1.6 | 2.1 | 3.2 | ||
| 1.5 | 2 | 2.9 | ||
| 1.4 | 1.9 | 2.8 | ||
| 1.4 | 1.8 | 2.6 | ||
| 1.4 | 1.8 | 2.5 | ||
| 1.4 | 1.8 | 2.5 | ||
| 1.3 | 1.7 | 2.5 |
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 24 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 | — | 1.3 | — | |
| February | — | 1.2 | — | |
| March | — | 2.3 | — | |
| April | — | 2.5 | — | |
| May | — | 12.5 | — | |
| June | — | 6.1 | — | |
| July | — | 2.8 | — | |
| August | — | 1.9 | — | |
| September | — | 0.9 | — | |
| October | — | 2.9 | — | |
| November | — | 1.9 | — | |
| December | — | 1.5 | — |
All values in cubic feet per second (cfs).
Common questions
- When does West Fork Beaver Creek near Rocky Boy, MT normally run highest?
- May, on the long-term record. The median daily flow that month is about 12.5 cfs, against 0.9 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has West Fork Beaver Creek near Rocky Boy, MT been measured?
- Discharge records at USGS site 06139800 begin in 2001, about 25 years, covering roughly 1,272 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for West Fork Beaver Creek near Rocky Boy, 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 West Fork Beaver Creek near Rocky Boy, MT?
- The gauge sits at 48.17615, -109.64213, in Montana, in hydrologic subbasin 10050004, at an elevation of about 4,650 feet, draining roughly 3 square miles.
- Can I use West Fork Beaver Creek near Rocky Boy, 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.