USGS Streamgage 06018500
Beaverhead River near Twin Bridges, MT
Beaverhead River near Twin Bridges, MT is USGS streamgage 06018500 in Montana, monitoring river discharge in hydrologic subbasin 10020002. It sits on the Beaverhead River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,618 square miles. Discharge records at this site go back to 1935. Typical flow runs near 138.5 cfs in July and 379.2 cfs in April, with the higher of the two arriving in April. 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
- 3,618 sq mi
- Gauge elevation
- 4,818 ft
- Subbasin (HUC-8)
- 10020002
- Coordinates
- 45.38339, -112.45283
- USGS site number
- 06018500
- Records begin
- 1935-08-21 (91 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Beaverhead River near Twin Bridges, 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 |
|---|---|---|---|---|
| 60.7 | 68 | 78 | ||
| 59.2 | 69.6 | 85.7 | ||
| 56.2 | 68.2 | 87.8 | ||
| 56 | 69.5 | 95.9 | ||
| 53.8 | 68.6 | 96.3 | ||
| 55.2 | 71.8 | 104 | ||
| 60.5 | 81.2 | 124 | ||
| 62 | 85.9 | 141 | ||
| 61 | 84.6 | 139 | ||
| 58 | 81.4 | 135 | ||
| 57 | 80.4 | 136 | ||
| 56.3 | 79.7 | 135 | ||
| 56.1 | 83.2 | 157 | ||
| 55.2 | 82.2 | 156 |
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 91 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 | 195.1 | 381 | 534.3 | |
| February | 205.1 | 391.5 | 549.1 | |
| March | 240 | 423.9 | 609.9 | |
| April | 138.9 | 379.2 | 749.7 | |
| May | 52.6 | 169.4 | 660.8 | |
| June | 47.8 | 163.4 | 865.2 | |
| July | 48.5 | 138.5 | 510 | |
| August | 63.4 | 146.4 | 409.1 | |
| September | 95.8 | 245.9 | 644.7 | |
| October | 164.1 | 347.6 | 732.1 | |
| November | 243.9 | 484 | 750 | |
| December | 214.7 | 436.2 | 655.9 |
All values in cubic feet per second (cfs).
Common questions
- When does Beaverhead River near Twin Bridges, MT normally run highest?
- November, on the long-term record. The median daily flow that month is about 484 cfs, against 138.5 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Beaverhead River near Twin Bridges, MT?
- It depends on the month. In January, half of days historically fall near 381 cfs, with the middle 80% of days between 195.1 and 534.3 cfs. The month-by-month table on this page gives the full range.
- How long has Beaverhead River near Twin Bridges, MT been measured?
- Discharge records at USGS site 06018500 begin in 1935, about 91 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Beaverhead River near Twin Bridges, 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 Beaverhead River near Twin Bridges, MT?
- The gauge sits at 45.38339, -112.45283, in Montana, in hydrologic subbasin 10020002, at an elevation of about 4,818 feet, draining roughly 3,618 square miles.
- Can I use Beaverhead River near Twin Bridges, 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.
Upstream and downstream on the Beaverhead River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Beaverhead River in full.
- Beaverhead River at Barretts, MT 2,730 sq mi
- Beaverhead River at Dillon, MT 2,892 sq mi
- Beaverhead River near Twin Bridges, MT this page