USGS Streamgage 06295000
Yellowstone River at Forsyth, MT
Yellowstone River at Forsyth, MT is USGS streamgage 06295000 in Montana, monitoring river discharge in hydrologic subbasin 10100001. It drains a watershed of about 40,152 square miles. Discharge records at this site go back to 1921. Typical flow runs near 15,554.2 cfs in July and 7,204 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 40,152 sq mi
- Gauge elevation
- 2,512 ft
- Subbasin (HUC-8)
- 10100001
- Coordinates
- 46.26664, -106.6913
- USGS site number
- 06295000
- Records begin
- 1921-05-15 (105 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 49 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 | 4,001.6 | 5,467.4 | 7,152.3 | |
| February | 3,862.8 | 5,480.3 | 7,881.4 | |
| March | 4,139 | 6,066.1 | 11,104.8 | |
| April | 4,574.7 | 7,204 | 13,426.7 | |
| May | 9,503.2 | 17,067.7 | 29,293.5 | |
| June | 15,217.3 | 28,840 | 51,340 | |
| July | 6,856.8 | 15,554.2 | 31,254.8 | |
| August | 3,723.9 | 6,633.9 | 12,627.1 | |
| September | 3,805.7 | 6,015.3 | 9,928.3 | |
| October | 4,491.3 | 6,971.3 | 10,362.3 | |
| November | 4,562 | 6,829 | 9,228.3 | |
| December | 4,046.1 | 6,021.9 | 7,484.2 |
All values in cubic feet per second (cfs).