USGS Streamgage 09047700
Keystone Gulch near Dillon, CO
Keystone Gulch near Dillon, CO is USGS streamgage 09047700 in Colorado, monitoring river discharge in hydrologic subbasin 14010002. It drains a watershed of about 9 square miles. Discharge records at this site go back to 1957. Typical flow runs near 8.1 cfs in July and 3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Colorado
- Drainage area
- 9 sq mi
- Gauge elevation
- 9,360 ft
- Subbasin (HUC-8)
- 14010002
- Coordinates
- 39.59443, -105.97252
- USGS site number
- 09047700
- Records begin
- 1957-10-01 (69 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 69 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 | 1.8 | 2.3 | 2.8 | |
| February | 1.5 | 2.1 | 2.6 | |
| March | 1.5 | 2 | 2.7 | |
| April | 2 | 3 | 5.1 | |
| May | 5.2 | 10.9 | 23 | |
| June | 7.4 | 20.9 | 43 | |
| July | 3.8 | 8.1 | 16.4 | |
| August | 2.7 | 4.6 | 7.3 | |
| September | 2.3 | 3.4 | 5 | |
| October | 2.2 | 3 | 4.7 | |
| November | 2.2 | 3 | 4.2 | |
| December | 2 | 2.6 | 3.4 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Tenmile Creek below North Tenmile C, at Frisco, CO
- Blue River below Dillon, CO
- Straight Creek below Laskey Gulch near Dillon, CO
- Blue River above Green Mountain Reservoir, CO
- Elliott Creek Feeder Canal to Green Mtn Reservoir, CO
- Blue River below Green Mountain Reservoir, CO
- Monte Cristo Diversion near Hoosier Pass, CO
- Bemrose-Hoosier Diversion near Hoosier Pass, CO