USGS Streamgage 06200000
Boulder River at Big Timber, MT
Boulder River at Big Timber, MT is USGS streamgage 06200000 in Montana, monitoring river discharge in hydrologic subbasin 10070002. It drains a watershed of about 525 square miles. Discharge records at this site go back to 1947. Typical flow runs near 996 cfs in July and 191.4 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 525 sq mi
- Gauge elevation
- 4,056 ft
- Subbasin (HUC-8)
- 10070002
- Coordinates
- 45.83379, -109.93871
- USGS site number
- 06200000
- Records begin
- 1947-04-01 (79 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 78 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 | 85.2 | 135.1 | 184.1 | |
| February | 85.1 | 126 | 172.2 | |
| March | 98 | 126.6 | 170.9 | |
| April | 124.6 | 191.4 | 363.7 | |
| May | 439.6 | 1,000.1 | 2,163.5 | |
| June | 1,261.2 | 2,552.3 | 4,653.3 | |
| July | 362.8 | 996 | 2,244 | |
| August | 77.5 | 187.3 | 438 | |
| September | 63.4 | 151.9 | 340.4 | |
| October | 114.7 | 209.3 | 343.7 | |
| November | 129.5 | 191.7 | 270.9 | |
| December | 99 | 156.6 | 211.8 |
All values in cubic feet per second (cfs).