USGS Streamgage 09403000
Bright Angel Creek near Grand Canyon, Ariz.
Bright Angel Creek near Grand Canyon, Ariz. is USGS streamgage 09403000 in Arizona, monitoring river discharge in hydrologic subbasin 15010001. It sits on the Bright Angel Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 101 square miles. Discharge records at this site go back to 1923. Typical flow runs near 21.6 cfs in July and 56.5 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
- 101 sq mi
- Gauge elevation
- 2,458 ft
- Subbasin (HUC-8)
- 15010001
- Coordinates
- 36.09972, -112.09389
- USGS site number
- 09403000
- Records begin
- 1923-10-01 (103 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Bright Angel Creek near Grand Canyon, Ariz.. 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 |
|---|---|---|---|---|
| 13.5 | 15.6 | 25.4 | ||
| 15 | 28.7 | 64.2 | ||
| 13 | 17.4 | 33.4 | ||
| 12.3 | 14.4 | 23 | ||
| 12.1 | 13.5 | 18.3 | ||
| 11.9 | 13.1 | 16.4 | ||
| 12.1 | 13.9 | 20.3 | ||
| 12 | 13.6 | 18.5 | ||
| 11.7 | 13.1 | 16.3 | ||
| 11.7 | 13.3 | 17.4 | ||
| 11.9 | 13.8 | 20.5 | ||
| 11.9 | 14.1 | 21.4 | ||
| 11.6 | 13.4 | 17.5 | ||
| 11.4 | 13 | 16.2 |
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 103 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 | 17 | 21 | 27.7 | |
| February | 17 | 21.7 | 30.7 | |
| March | 17.6 | 23.8 | 41.2 | |
| April | 21.7 | 56.5 | 167.6 | |
| May | 21.2 | 57.8 | 267.4 | |
| June | 17.4 | 25.4 | 63 | |
| July | 15.5 | 21.6 | 29.9 | |
| August | 14.9 | 20.6 | 27.4 | |
| September | 14.5 | 19.8 | 27.4 | |
| October | 15.4 | 19.5 | 27.3 | |
| November | 16.1 | 20.1 | 26.5 | |
| December | 17 | 21.5 | 27.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Bright Angel Creek near Grand Canyon, Ariz. normally run highest?
- May, on the long-term record. The median daily flow that month is about 57.8 cfs, against 19.5 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Bright Angel Creek near Grand Canyon, Ariz.?
- It depends on the month. In January, half of days historically fall near 21 cfs, with the middle 80% of days between 17 and 27.7 cfs. The month-by-month table on this page gives the full range.
- How long has Bright Angel Creek near Grand Canyon, Ariz. been measured?
- Discharge records at USGS site 09403000 begin in 1923, about 103 years, covering roughly 379 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Bright Angel Creek near Grand Canyon, Ariz.?
- 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 Bright Angel Creek near Grand Canyon, Ariz.?
- The gauge sits at 36.09972, -112.09389, in Arizona, in hydrologic subbasin 15010001, at an elevation of about 2,458 feet, draining roughly 101 square miles.
- Can I use Bright Angel Creek near Grand Canyon, Ariz. 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 Bright Angel Creek
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Bright Angel Creek in full.
- Bright Angel Creek below Cottonwood Campgd In Gcnp, AZ 53 sq mi
- Bright Angel Creek near Grand Canyon, Ariz. this page