USGS Streamgage 09439000
Gila River at Duncan, AZ
Gila River at Duncan, AZ is USGS streamgage 09439000 in Arizona, monitoring river discharge in hydrologic subbasin 15040002. It drains a watershed of about 3,589 square miles. Discharge records at this site go back to 2003. Typical flow runs near 13 cfs in July and 99.6 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Drainage area
- 3,589 sq mi
- Gauge elevation
- 3,631 ft
- Subbasin (HUC-8)
- 15040002
- Coordinates
- 32.72444, -109.09917
- USGS site number
- 09439000
- Records begin
- 2003-08-07 (23 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 23 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 | 53.3 | 109.7 | 625.6 | |
| February | 50.8 | 158.8 | 1,301.4 | |
| March | 37.4 | 175.6 | 902.8 | |
| April | 12.8 | 99.6 | 481.8 | |
| May | 0.7 | 32 | 150.9 | |
| June | 0 | 2.4 | 48.8 | |
| July | 0 | 13 | 236.8 | |
| August | 0.1 | 71.5 | 997.8 | |
| September | 0.1 | 48.3 | 767 | |
| October | 0 | 34 | 434.7 | |
| November | 0 | 53.8 | 230.1 | |
| December | 26.6 | 92.3 | 326.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Gila River at Duncan, AZ normally run highest?
- March, on the long-term record. The median daily flow that month is about 175.6 cfs, against 2.4 cfs in June, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Gila River at Duncan, AZ?
- It depends on the month. In January, half of days historically fall near 109.7 cfs, with the middle 80% of days between 53.3 and 625.6 cfs. The month-by-month table on this page gives the full range.
- How long has Gila River at Duncan, AZ been measured?
- Discharge records at USGS site 09439000 begin in 2003, about 23 years, covering roughly 7,927 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Gila River at Duncan, AZ?
- The gauge sits at 32.72444, -109.09917, in Arizona, in hydrologic subbasin 15040002, at an elevation of about 3,631 feet, draining roughly 3,589 square miles.
- Can I use Gila River at Duncan, AZ data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.