USGS Streamgage 06111800
Big Spring Creek at R&B Trading Post near Lewistown, MT
Big Spring Creek at R&B Trading Post near Lewistown, MT is USGS streamgage 06111800 in Montana, monitoring river discharge in hydrologic subbasin 10040103. It drains a watershed of about 191 square miles. Discharge records at this site go back to 2014. Typical flow runs near 157.6 cfs in July and 183.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 191 sq mi
- Gauge elevation
- 3,852 ft
- Subbasin (HUC-8)
- 10040103
- Coordinates
- 47.08783, -109.4575
- USGS site number
- 06111800
- Records begin
- 2014-10-01 (12 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 11 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 | 136.7 | 154.4 | 179.9 | |
| February | 136.5 | 156.2 | 209.4 | |
| March | 137.6 | 165.7 | 285 | |
| April | 140.5 | 183.5 | 271.4 | |
| May | 150.5 | 212 | 404 | |
| June | 116.8 | 192.7 | 485.6 | |
| July | 105.2 | 157.6 | 206.2 | |
| August | 105.1 | 140.7 | 169.9 | |
| September | 114.7 | 154.1 | 186.5 | |
| October | 138.7 | 164.9 | 188.2 | |
| November | 140.5 | 165.6 | 175.6 | |
| December | 137.6 | 158.3 | 172.6 |
All values in cubic feet per second (cfs).