USGS Streamgage 09512500
Agua Fria River near Mayer, AZ
Agua Fria River near Mayer, AZ is USGS streamgage 09512500 in Arizona, monitoring river discharge in hydrologic subbasin 15070102. It drains a watershed of about 585 square miles. Discharge records at this site go back to 1940. Typical flow runs near 0.9 cfs in July and 2.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Drainage area
- 585 sq mi
- Gauge elevation
- 3,434 ft
- Subbasin (HUC-8)
- 15070102
- Coordinates
- 34.31505, -112.06389
- USGS site number
- 09512500
- Records begin
- 1940-01-01 (86 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 87 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 | 0.8 | 3.7 | 21.2 | |
| February | 1.3 | 4.4 | 69.3 | |
| March | 0.9 | 4.7 | 97.7 | |
| April | 0.5 | 2.9 | 23.1 | |
| May | 0.2 | 1.2 | 6.2 | |
| June | 0.1 | 0.6 | 3.2 | |
| July | 0.1 | 0.9 | 23.3 | |
| August | 0.2 | 1.5 | 55 | |
| September | 0.2 | 0.9 | 13.3 | |
| October | 0.2 | 0.9 | 4.9 | |
| November | 0.3 | 1.3 | 7.1 | |
| December | 0.5 | 2.5 | 14.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Agua Fria River near Mayer, AZ normally run highest?
- March, on the long-term record. The median daily flow that month is about 4.7 cfs, against 0.6 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 Agua Fria River near Mayer, AZ?
- It depends on the month. In January, half of days historically fall near 3.7 cfs, with the middle 80% of days between 0.8 and 21.2 cfs. The month-by-month table on this page gives the full range.
- How long has Agua Fria River near Mayer, AZ been measured?
- Discharge records at USGS site 09512500 begin in 1940, about 86 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Agua Fria River near Mayer, AZ?
- The gauge sits at 34.31505, -112.06389, in Arizona, in hydrologic subbasin 15070102, at an elevation of about 3,434 feet, draining roughly 585 square miles.
- Can I use Agua Fria River near Mayer, 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.