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 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.
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)
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).