USGS Streamgage 09490500
Black River near Fort Apache, AZ
Black River near Fort Apache, AZ is USGS streamgage 09490500 in Arizona, monitoring river discharge in hydrologic subbasin 15060101. It drains a watershed of about 1,232 square miles. Discharge records at this site go back to 1912. Typical flow runs near 50.9 cfs in July and 520.3 cfs in April, with the higher of the two arriving in April. 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
- 1,232 sq mi
- Gauge elevation
- 4,345 ft
- Subbasin (HUC-8)
- 15060101
- Coordinates
- 33.71283, -110.21177
- USGS site number
- 09490500
- Records begin
- 1912-11-24 (114 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Black River near Fort Apache, 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 |
|---|---|---|---|---|
| 50.4 | 63.6 | 129 | ||
| 48.5 | 72.3 | 172 | ||
| 49.3 | 82.2 | 215 | ||
| 49.2 | 86.4 | 207 | ||
| 45.9 | 75.7 | 157 | ||
| 42.3 | 65.4 | 129 | ||
| 39.5 | 57.3 | 104 | ||
| 37.5 | 52.5 | 89.2 | ||
| 36.8 | 50.6 | 80.4 | ||
| 35.5 | 49.1 | 79.2 | ||
| 34.3 | 48.6 | 82.5 | ||
| 34.1 | 51 | 94.6 | ||
| 34.3 | 53.7 | 107 | ||
| 33 | 51.3 | 99.7 |
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 111 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 | 46.1 | 97.8 | 832.3 | |
| February | 54.4 | 226.2 | 1,474.8 | |
| March | 63.1 | 616.2 | 2,120 | |
| April | 63.4 | 520.3 | 2,423.3 | |
| May | 33.4 | 170 | 901.7 | |
| June | 21.9 | 48.5 | 167.4 | |
| July | 27.3 | 50.9 | 156.9 | |
| August | 37 | 99.9 | 423.6 | |
| September | 32.9 | 75.6 | 305 | |
| October | 32.5 | 55.2 | 240.5 | |
| November | 38 | 62.6 | 261.5 | |
| December | 40.1 | 74 | 551.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Black River near Fort Apache, AZ normally run highest?
- March, on the long-term record. The median daily flow that month is about 616.2 cfs, against 48.5 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 Black River near Fort Apache, AZ?
- It depends on the month. In January, half of days historically fall near 97.8 cfs, with the middle 80% of days between 46.1 and 832.3 cfs. The month-by-month table on this page gives the full range.
- How long has Black River near Fort Apache, AZ been measured?
- Discharge records at USGS site 09490500 begin in 1912, about 114 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 Black River near Fort Apache, 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 Black River near Fort Apache, AZ?
- The gauge sits at 33.71283, -110.21177, in Arizona, in hydrologic subbasin 15060101, at an elevation of about 4,345 feet, draining roughly 1,232 square miles.
- Can I use Black River near Fort Apache, 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.