USGS Streamgage 09471000
San Pedro River at Charleston, AZ
San Pedro River at Charleston, AZ is USGS streamgage 09471000 in Arizona, monitoring river discharge in hydrologic subbasin 15050202. It sits on the San Pedro River, alongside 3 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,234 square miles. Discharge records at this site go back to 1904. Typical flow runs near 23.1 cfs in July and 10 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Arizona
- Drainage area
- 1,234 sq mi
- Gauge elevation
- 3,957 ft
- Subbasin (HUC-8)
- 15050202
- Coordinates
- 31.62594, -110.1751
- USGS site number
- 09471000
- Records begin
- 1904-03-29 (122 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for San Pedro River at Charleston, AZ. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 20.2 | 46.9 | 139 | ||
| 9.5 | 22.4 | 60.1 | ||
| 5.1 | 11.7 | 29.8 | ||
| 3.5 | 7.8 | 18.1 | ||
| 2.5 | 5.8 | 12.3 | ||
| 2 | 5.2 | 13.1 | ||
| 1.8 | 4.6 | 10.3 | ||
| 1.4 | 3.9 | 9.1 | ||
| 1 | 3.1 | 7.5 | ||
| 1 | 3.5 | 15.6 | ||
| 1.2 | 5.1 | 31 | ||
| 1 | 4 | 16.5 | ||
| 0.9 | 3.8 | 17 | ||
| 0.9 | 3.8 | 13.8 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 123 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 | 8.2 | 15.3 | 39.5 | |
| February | 8.8 | 14.5 | 42.2 | |
| March | 8.8 | 14 | 34.9 | |
| April | 5.8 | 10 | 19.2 | |
| May | 3.1 | 6.1 | 11.5 | |
| June | 1.1 | 3 | 12.6 | |
| July | 1.8 | 23.1 | 296.7 | |
| August | 5.3 | 47 | 502.7 | |
| September | 3.3 | 14.7 | 122.5 | |
| October | 2.7 | 7 | 34.3 | |
| November | 5.1 | 10.6 | 24.9 | |
| December | 6.9 | 13.8 | 31.7 |
All values in cubic feet per second (cfs).
Common questions
- When does San Pedro River at Charleston, AZ normally run highest?
- August, on the long-term record. The median daily flow that month is about 47 cfs, against 3 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 San Pedro River at Charleston, AZ?
- It depends on the month. In January, half of days historically fall near 15.3 cfs, with the middle 80% of days between 8.2 and 39.5 cfs. The month-by-month table on this page gives the full range.
- How long has San Pedro River at Charleston, AZ been measured?
- Discharge records at USGS site 09471000 begin in 1904, about 122 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for San Pedro River at Charleston, AZ?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is San Pedro River at Charleston, AZ?
- The gauge sits at 31.62594, -110.1751, in Arizona, in hydrologic subbasin 15050202, at an elevation of about 3,957 feet, draining roughly 1,234 square miles.
- Can I use San Pedro River at Charleston, 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.
Upstream and downstream on the San Pedro River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the San Pedro River in full.
- San Pedro River at Palominas, AZ 737 sq mi
- San Pedro River at Charleston, AZ this page
- San Pedro River near Tombstone, AZ 1,740 sq mi
- San Pedro River at Redington Bridge near Redington, AZ 3,096 sq mi