USGS Streamgage 06208500
Clarks Fork Yellowstone River at Edgar, MT
Clarks Fork Yellowstone River at Edgar, MT is USGS streamgage 06208500 in Montana, monitoring river discharge in hydrologic subbasin 10070006. It drains a watershed of about 2,045 square miles. Discharge records at this site go back to 1921. Typical flow runs near 1,765.8 cfs in July and 491.6 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 2,045 sq mi
- Gauge elevation
- 3,452 ft
- Subbasin (HUC-8)
- 10070006
- Coordinates
- 45.46571, -108.84411
- USGS site number
- 06208500
- Records begin
- 1921-07-29 (105 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 105 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 | 248.2 | 360.6 | 472.3 | |
| February | 246.1 | 350.3 | 466.1 | |
| March | 251.6 | 354.3 | 512.2 | |
| April | 312.1 | 491.6 | 963.4 | |
| May | 799.7 | 1,894.2 | 3,998.4 | |
| June | 2,014 | 3,720.7 | 7,042 | |
| July | 590.5 | 1,765.8 | 3,581.3 | |
| August | 169.1 | 482.7 | 1,083.9 | |
| September | 201 | 397.3 | 773.8 | |
| October | 331.3 | 531.2 | 812 | |
| November | 378.5 | 516.5 | 670.7 | |
| December | 275.6 | 422.9 | 553.7 |
All values in cubic feet per second (cfs).