USGS Streamgage 06033000
Boulder River near Boulder, MT
Boulder River near Boulder, MT is USGS streamgage 06033000 in Montana, monitoring river discharge in hydrologic subbasin 10020006. It drains a watershed of about 381 square miles. Discharge records at this site go back to 1929. Typical flow runs near 70.9 cfs in July and 129.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 381 sq mi
- Gauge elevation
- 4,824 ft
- Subbasin (HUC-8)
- 10020006
- Coordinates
- 46.21103, -112.09165
- USGS site number
- 06033000
- Records begin
- 1929-05-01 (97 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 97 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 | 15.8 | 27.7 | 40.5 | |
| February | 18.2 | 30.3 | 43.3 | |
| March | 26 | 40.6 | 88 | |
| April | 51.1 | 129.8 | 338.5 | |
| May | 186.9 | 407 | 904.4 | |
| June | 122.2 | 335.3 | 847.4 | |
| July | 21 | 70.9 | 208.4 | |
| August | 9 | 23.4 | 71.8 | |
| September | 9.5 | 22.5 | 57 | |
| October | 16.5 | 32.9 | 69.5 | |
| November | 19 | 34.3 | 59.3 | |
| December | 17.4 | 28.6 | 44.4 |
All values in cubic feet per second (cfs).