USGS Streamgage 06012500
Red Rock River below Lima Reservoir near Monida, MT
Red Rock River below Lima Reservoir near Monida, MT is USGS streamgage 06012500 in Montana, monitoring river discharge in hydrologic subbasin 10020001. It drains a watershed of about 566 square miles. Discharge records at this site go back to 1911. Typical flow runs near 309 cfs in July and 35.6 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 566 sq mi
- Gauge elevation
- 6,542 ft
- Subbasin (HUC-8)
- 10020001
- Coordinates
- 44.65588, -112.37122
- USGS site number
- 06012500
- Records begin
- 1911-01-01 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 115 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 | 0.7 | 21.6 | 38.1 | |
| February | 1.4 | 19 | 38.6 | |
| March | 0.8 | 19.9 | 36.5 | |
| April | 3.2 | 35.6 | 237 | |
| May | 76.6 | 285.3 | 585.3 | |
| June | 246.8 | 472.8 | 652.1 | |
| July | 62.9 | 309 | 453.8 | |
| August | 14.7 | 230.8 | 357.7 | |
| September | 3.9 | 98.7 | 307.2 | |
| October | 5.6 | 32.4 | 181.2 | |
| November | 4.8 | 23.9 | 146.6 | |
| December | 0.8 | 23 | 65.5 |
All values in cubic feet per second (cfs).