USGS Streamgage 06020600
Ruby River below reservoir near Alder, MT
Ruby River below reservoir near Alder, MT is USGS streamgage 06020600 in Montana, monitoring river discharge in hydrologic subbasin 10020003. It drains a watershed of about 595 square miles. Discharge records at this site go back to 1962. Typical flow runs near 319.9 cfs in July and 69.4 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 595 sq mi
- Gauge elevation
- 5,294 ft
- Subbasin (HUC-8)
- 10020003
- Coordinates
- 45.24187, -112.11124
- USGS site number
- 06020600
- Records begin
- 1962-11-30 (64 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 63 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 | 25.6 | 43.9 | 83.1 | |
| February | 24.1 | 42.3 | 73 | |
| March | 25.2 | 44.7 | 106.8 | |
| April | 33.5 | 69.4 | 187.6 | |
| May | 184.9 | 375.2 | 700.7 | |
| June | 297.1 | 472.7 | 967.3 | |
| July | 245.1 | 319.9 | 474 | |
| August | 254.5 | 333.3 | 429.7 | |
| September | 145.4 | 238.8 | 335.9 | |
| October | 43.8 | 85.8 | 187.5 | |
| November | 36.8 | 61.6 | 109.8 | |
| December | 27.2 | 46.2 | 95.8 |
All values in cubic feet per second (cfs).