USGS Streamgage 12342500
West Fork Bitterroot River near Conner, MT
West Fork Bitterroot River near Conner, MT is USGS streamgage 12342500 in Montana, monitoring river discharge in hydrologic subbasin 17010205. It drains a watershed of about 317 square miles. Discharge records at this site go back to 1941. Typical flow runs near 237.2 cfs in July and 148.7 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
- 317 sq mi
- Gauge elevation
- 4,671 ft
- Subbasin (HUC-8)
- 17010205
- Coordinates
- 45.72483, -114.28229
- USGS site number
- 12342500
- Records begin
- 1941-05-01 (85 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for West Fork Bitterroot River near Conner, 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 |
|---|---|---|---|---|
| 317 | 325 | 335 | ||
| 310 | 323 | 333 | ||
| 298 | 320 | 334 | ||
| 264 | 317 | 336 | ||
| 240 | 314 | 337 | ||
| 212 | 310 | 339 | ||
| 190 | 304 | 338 | ||
| 171 | 296 | 336 | ||
| 155 | 288 | 333 | ||
| 142 | 279 | 330 | ||
| 129 | 268 | 326 | ||
| 121 | 260 | 322 | ||
| 112 | 250 | 318 | ||
| 105 | 240 | 314 |
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 84 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 | 50.5 | 69.4 | 113.9 | |
| February | 50.9 | 68 | 113.4 | |
| March | 54.3 | 75.9 | 148.1 | |
| April | 63.9 | 148.7 | 432.3 | |
| May | 204.5 | 695.3 | 1,674.7 | |
| June | 346.4 | 777.4 | 1,609.2 | |
| July | 136.9 | 237.2 | 433.8 | |
| August | 103.8 | 232.7 | 359.9 | |
| September | 78.7 | 173.2 | 316.1 | |
| October | 59.4 | 94.5 | 291.3 | |
| November | 57.2 | 79.8 | 168.1 | |
| December | 53.8 | 72.3 | 120.6 |
All values in cubic feet per second (cfs).
Common questions
- When does West Fork Bitterroot River near Conner, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 777.4 cfs, against 68 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 West Fork Bitterroot River near Conner, MT?
- It depends on the month. In January, half of days historically fall near 69.4 cfs, with the middle 80% of days between 50.5 and 113.9 cfs. The month-by-month table on this page gives the full range.
- How long has West Fork Bitterroot River near Conner, MT been measured?
- Discharge records at USGS site 12342500 begin in 1941, about 85 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 West Fork Bitterroot River near Conner, 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 Bitterroot River near Conner, MT?
- The gauge sits at 45.72483, -114.28229, in Montana, in hydrologic subbasin 17010205, at an elevation of about 4,671 feet, draining roughly 317 square miles.
- Can I use West Fork Bitterroot River near Conner, 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.