USGS Streamgage 12370000
Swan River near Bigfork, MT
Swan River near Bigfork, MT is USGS streamgage 12370000 in Montana, monitoring river discharge in hydrologic subbasin 17010211. It drains a watershed of about 672 square miles. Discharge records at this site go back to 1922. Typical flow runs near 1,535.7 cfs in July and 1,352.1 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 672 sq mi
- Gauge elevation
- 3,078 ft
- Subbasin (HUC-8)
- 17010211
- Coordinates
- 48.02423, -113.97882
- USGS site number
- 12370000
- Records begin
- 1922-05-01 (104 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 103 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 | 333.4 | 448.4 | 695.5 | |
| February | 317.9 | 434.4 | 753 | |
| March | 354.4 | 572.2 | 1,037.6 | |
| April | 726.4 | 1,352.1 | 2,528 | |
| May | 1,622.9 | 2,582.6 | 4,395.2 | |
| June | 1,895.3 | 3,071 | 4,996 | |
| July | 818.3 | 1,535.7 | 2,555.2 | |
| August | 421.9 | 653.2 | 996 | |
| September | 351 | 487.6 | 732.4 | |
| October | 339.3 | 494.8 | 770.9 | |
| November | 366.8 | 542.6 | 870.4 | |
| December | 354.8 | 484.9 | 823.8 |
All values in cubic feet per second (cfs).
Other gauges in this region
- Pack River near Colburn, ID
- Colville River at Kettle Falls, WA
- Sanpoil River above Jack Creek at Keller, WA
- Goose Creek Ab Trapper Creek near Oakley, ID
- Camas Creek at Camas, ID
- Medicine Lodge Creek near Small, ID
- Camas Creek near Blaine, ID
- SF Owyhee River below Ltl Owyhee River near Crutcher Xing, ID