USGS Streamgage 06287000
Bighorn River below Yellowtail Afterbay Dam near St. Xavier
Bighorn River below Yellowtail Afterbay Dam near St. Xavier is USGS streamgage 06287000 in Montana, monitoring river discharge in hydrologic subbasin 10080015. It drains a watershed of about 19,670 square miles. Discharge records at this site go back to 1934. Typical flow runs near 4,241 cfs in July and 2,509 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 19,670 sq mi
- Gauge elevation
- 3,165 ft
- Subbasin (HUC-8)
- 10080015
- Coordinates
- 45.3169, -107.91889
- USGS site number
- 06287000
- Records begin
- 1934-10-01 (92 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 92 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 | 1,441.3 | 2,539.4 | 3,725.2 | |
| February | 1,473.1 | 2,475.5 | 3,881.7 | |
| March | 1,563.2 | 2,632.9 | 4,727.4 | |
| April | 1,495.3 | 2,509 | 5,492.3 | |
| May | 1,637.7 | 3,317.7 | 6,929.4 | |
| June | 2,017.3 | 5,864.3 | 13,373.7 | |
| July | 1,863.5 | 4,241 | 10,816.8 | |
| August | 1,520 | 2,456.1 | 4,648.7 | |
| September | 1,602.3 | 2,532.3 | 3,957.3 | |
| October | 1,545.2 | 2,735.2 | 4,363.5 | |
| November | 1,508.7 | 2,690 | 4,345 | |
| December | 1,482.6 | 2,652.9 | 3,866.5 |
All values in cubic feet per second (cfs).