USGS Streamgage 09466500
Gila River at Calva, AZ
Gila River at Calva, AZ is USGS streamgage 09466500 in Arizona, monitoring river discharge in hydrologic subbasin 15040005. It drains a watershed of about 11,470 square miles. Discharge records at this site go back to 1916. Typical flow runs near 13.7 cfs in July and 105.6 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Drainage area
- 11,470 sq mi
- Gauge elevation
- 2,519 ft
- Subbasin (HUC-8)
- 15040005
- Coordinates
- 33.18564, -110.22011
- USGS site number
- 09466500
- Records begin
- 1916-01-20 (110 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 97 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 | 56 | 186.2 | 1,202.3 | |
| February | 50.6 | 192.4 | 2,122.1 | |
| March | 32.1 | 167.2 | 2,168.4 | |
| April | 19.9 | 105.6 | 1,211.7 | |
| May | 6.6 | 41.7 | 476.7 | |
| June | 0 | 10.2 | 102.4 | |
| July | 0 | 13.7 | 214.3 | |
| August | 1.1 | 56.4 | 851.5 | |
| September | 0.5 | 43.7 | 699.5 | |
| October | 1.4 | 38.7 | 457.4 | |
| November | 9.7 | 85.3 | 394.1 | |
| December | 16.4 | 116.4 | 737.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Gila River at Calva, AZ normally run highest?
- February, on the long-term record. The median daily flow that month is about 192.4 cfs, against 10.2 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 Calva, AZ?
- It depends on the month. In January, half of days historically fall near 186.2 cfs, with the middle 80% of days between 56 and 1,202.3 cfs. The month-by-month table on this page gives the full range.
- How long has Gila River at Calva, AZ been measured?
- Discharge records at USGS site 09466500 begin in 1916, about 110 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Gila River at Calva, AZ?
- The gauge sits at 33.18564, -110.22011, in Arizona, in hydrologic subbasin 15040005, at an elevation of about 2,519 feet, draining roughly 11,470 square miles.
- Can I use Gila River at Calva, 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.