USGS Streamgage 09380000
Colorado River at Lees Ferry, AZ
Colorado River at Lees Ferry, AZ is USGS streamgage 09380000 in Arizona, monitoring river discharge in hydrologic subbasin 14070006. It drains a watershed of about 111,800 square miles. Discharge records at this site go back to 1884. Typical flow runs near 14,935.5 cfs in July and 11,843.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Arizona
- Drainage area
- 111,800 sq mi
- Gauge elevation
- 3,143 ft
- Subbasin (HUC-8)
- 14070006
- Coordinates
- 36.86433, -111.58787
- USGS site number
- 09380000
- Records begin
- 1884-01-01 (142 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 | 4,119.7 | 10,110 | 16,729 | |
| February | 5,099.7 | 9,564.8 | 16,231 | |
| March | 5,863.5 | 9,790.3 | 16,141.9 | |
| April | 7,563.3 | 11,843.3 | 28,790 | |
| May | 8,673.5 | 16,103.2 | 60,909.7 | |
| June | 9,508 | 17,206.7 | 69,973.3 | |
| July | 7,848.4 | 14,935.5 | 31,145.2 | |
| August | 4,992.3 | 13,377.4 | 21,593.5 | |
| September | 3,794 | 9,859.3 | 18,986.7 | |
| October | 4,739 | 8,518.7 | 15,712.9 | |
| November | 5,460.7 | 8,568.3 | 15,883.3 | |
| December | 4,509 | 9,228.7 | 16,148.4 |
All values in cubic feet per second (cfs).