USGS Streamgage 06023000
Ruby River near Twin Bridges, MT
Ruby River near Twin Bridges, MT is USGS streamgage 06023000 in Montana, monitoring river discharge in hydrologic subbasin 10020003. It sits on the Ruby River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 970 square miles. Discharge records at this site go back to 1940. Typical flow runs near 183.8 cfs in July and 146.7 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
- 970 sq mi
- Gauge elevation
- 4,676 ft
- Subbasin (HUC-8)
- 10020003
- Coordinates
- 45.50691, -112.33089
- USGS site number
- 06023000
- Records begin
- 1940-08-21 (86 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Ruby 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 |
|---|---|---|---|---|
| 101 | 110 | 118 | ||
| 98.2 | 111 | 124 | ||
| 94.5 | 111 | 130 | ||
| 91.9 | 112 | 135 | ||
| 90.5 | 113 | 141 | ||
| 89.6 | 116 | 148 | ||
| 91.9 | 120 | 156 | ||
| 91.2 | 121 | 161 | ||
| 91.8 | 125 | 172 | ||
| 89.1 | 121 | 165 | ||
| 86.7 | 120 | 165 | ||
| 87.5 | 121 | 168 | ||
| 86.4 | 121 | 170 | ||
| 86 | 122 | 172 |
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 85 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 | 99.2 | 138.4 | 199.7 | |
| February | 102.9 | 136 | 203.7 | |
| March | 101.7 | 137.2 | 254.8 | |
| April | 91.3 | 146.7 | 340.6 | |
| May | 30.8 | 155.6 | 474.4 | |
| June | 43.2 | 304.1 | 916.5 | |
| July | 60.5 | 183.8 | 445.1 | |
| August | 51.4 | 117.2 | 207.2 | |
| September | 102.9 | 175.7 | 291.7 | |
| October | 135.1 | 204 | 280.8 | |
| November | 152.8 | 215.4 | 294.7 | |
| December | 126.3 | 171.1 | 259.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Ruby River near Twin Bridges, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 304.1 cfs, against 117.2 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Ruby River near Twin Bridges, MT?
- It depends on the month. In January, half of days historically fall near 138.4 cfs, with the middle 80% of days between 99.2 and 199.7 cfs. The month-by-month table on this page gives the full range.
- How long has Ruby River near Twin Bridges, MT been measured?
- Discharge records at USGS site 06023000 begin in 1940, about 86 years, covering roughly 3,110 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Ruby 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 Ruby River near Twin Bridges, MT?
- The gauge sits at 45.50691, -112.33089, in Montana, in hydrologic subbasin 10020003, at an elevation of about 4,676 feet, draining roughly 970 square miles.
- Can I use Ruby 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 Ruby River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Ruby River in full.
- Ruby River above reservoir near Alder, MT 534 sq mi
- Ruby River below reservoir near Alder, MT 595 sq mi
- Ruby River near Twin Bridges, MT this page