USGS Streamgage 09217900
Blacks Fork near Robertson, WY
Blacks Fork near Robertson, WY is USGS streamgage 09217900 in Utah, monitoring river discharge in hydrologic subbasin 14040107. It drains a watershed of about 126 square miles. Discharge records at this site go back to 1938. Typical flow runs near 210.5 cfs in July and 47.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Utah
- Drainage area
- 126 sq mi
- Gauge elevation
- 8,819 ft
- Subbasin (HUC-8)
- 14040107
- Coordinates
- 40.95903, -110.57972
- USGS site number
- 09217900
- Records begin
- 1938-06-05 (88 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 60 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 | 17.6 | 24.5 | 36.5 | |
| February | 13.4 | 21.7 | 32.7 | |
| March | 10.9 | 23.6 | 36.5 | |
| April | 20.9 | 47.3 | 154.9 | |
| May | 146.2 | 368.7 | 796.7 | |
| June | 266.3 | 616.5 | 1,336.3 | |
| July | 73 | 210.5 | 570.7 | |
| August | 38.6 | 78.1 | 187.8 | |
| September | 32.1 | 53.6 | 115.9 | |
| October | 26.8 | 48.6 | 91.3 | |
| November | 22.6 | 39.1 | 59.1 | |
| December | 20.4 | 29.4 | 43.4 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Blacks Fork near Millburne, WY
- Blacks Fork below Blacks Fork Canal, near Robertson, WY
- Blacks Fork below Little Blacks Fk at Fort Bridger, WY
- Blacks Fork near Urie, WY
- Blacks Fork above Smiths Fork, near Lyman, WY
- East Fork Smiths Fork near Robertson, WY
- South Creek at Mountain View, WY
- Hams Fork below Pole Creek, near Frontier, WY