USGS Streamgage 09519501
Gila River below Gillespie Dam, Az (Low-Flow Station)
Gila River below Gillespie Dam, Az (Low-Flow Station) is USGS streamgage 09519501 in Arizona, monitoring river discharge in hydrologic subbasin 15070101. Discharge records at this site go back to 1992. Typical flow runs near 0.4 cfs in July and 3.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Gauge elevation
- 727 ft
- Subbasin (HUC-8)
- 15070101
- Coordinates
- 33.22736, -112.76861
- USGS site number
- 09519501
- Records begin
- 1992-10-01 (34 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 34 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 | 0 | 28.6 | 537.4 | |
| February | 0 | 12.4 | 1,594.5 | |
| March | 0 | 8.7 | 5,698.7 | |
| April | 0 | 3.4 | 2,059.7 | |
| May | 0 | 1.3 | 195.4 | |
| June | 0 | 0.4 | 39.9 | |
| July | 0 | 0.4 | 31.3 | |
| August | 0 | 0.3 | 54.4 | |
| September | 0 | 0.5 | 82.1 | |
| October | 0 | 3.2 | 192.9 | |
| November | 0 | 8.6 | 198.3 | |
| December | 1 | 34.1 | 280 |
All values in cubic feet per second (cfs).
Common questions
- When does Gila River below Gillespie Dam, Az (Low-Flow Station) normally run highest?
- December, on the long-term record. The median daily flow that month is about 34.1 cfs, against 0.3 cfs in August, 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 below Gillespie Dam, Az (Low-Flow Station)?
- It depends on the month. In January, half of days historically fall near 28.6 cfs, with the middle 80% of days between 0 and 537.4 cfs. The month-by-month table on this page gives the full range.
- How long has Gila River below Gillespie Dam, Az (Low-Flow Station) been measured?
- Discharge records at USGS site 09519501 begin in 1992, about 34 years, covering roughly 7,508 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Gila River below Gillespie Dam, Az (Low-Flow Station)?
- The gauge sits at 33.22736, -112.76861, in Arizona, in hydrologic subbasin 15070101, at an elevation of about 727 feet.
- Can I use Gila River below Gillespie Dam, Az (Low-Flow Station) 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.