USGS Streamgage 09426000
Bill Williams River below Alamo Dam, AZ
Bill Williams River below Alamo Dam, AZ is USGS streamgage 09426000 in Arizona, monitoring river discharge in hydrologic subbasin 15030204. It sits on the Bill Williams River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 4,633 square miles. Discharge records at this site go back to 1891. Typical flow runs near 24.9 cfs in July and 25.2 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
- 4,633 sq mi
- Gauge elevation
- 954 ft
- Subbasin (HUC-8)
- 15030204
- Coordinates
- 34.23108, -113.60993
- USGS site number
- 09426000
- Records begin
- 1891-02-21 (135 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Bill Williams River below Alamo Dam, 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 |
|---|---|---|---|---|
| 8.8 | 9.4 | 10 | ||
| 8.8 | 9.5 | 10.3 | ||
| 8.6 | 9.5 | 10.5 | ||
| 8.3 | 9.4 | 10.6 | ||
| 8.1 | 9.4 | 10.6 | ||
| 8.1 | 9.4 | 10.8 | ||
| 7.9 | 9.4 | 11.2 | ||
| 7.5 | 9.3 | 11.4 | ||
| 7.5 | 9.3 | 11.7 | ||
| 7.4 | 9.2 | 12.1 | ||
| 7.2 | 9.2 | 12.7 | ||
| 7.2 | 9.1 | 13.1 | ||
| 7.2 | 9.1 | 13.3 | ||
| 7.1 | 9.1 | 13.3 |
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 57 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 | 6.3 | 19.9 | 67.6 | |
| February | 8.2 | 23.8 | 444.6 | |
| March | 9.5 | 26.4 | 1,533.6 | |
| April | 6.2 | 25.2 | 380.8 | |
| May | 1.2 | 25 | 168.1 | |
| June | 0.6 | 25.1 | 117.8 | |
| July | 1 | 24.9 | 119.8 | |
| August | 7 | 26.4 | 178 | |
| September | 6.4 | 26.1 | 226.3 | |
| October | 6.3 | 20.5 | 123.7 | |
| November | 5.7 | 18.1 | 68.1 | |
| December | 6.1 | 17.9 | 66.4 |
All values in cubic feet per second (cfs).
Common questions
- When does Bill Williams River below Alamo Dam, AZ normally run highest?
- March, on the long-term record. The median daily flow that month is about 26.4 cfs, against 17.9 cfs in December, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Bill Williams River below Alamo Dam, AZ?
- It depends on the month. In January, half of days historically fall near 19.9 cfs, with the middle 80% of days between 6.3 and 67.6 cfs. The month-by-month table on this page gives the full range.
- How long has Bill Williams River below Alamo Dam, AZ been measured?
- Discharge records at USGS site 09426000 begin in 1891, about 135 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 Bill Williams River below Alamo Dam, 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 Bill Williams River below Alamo Dam, AZ?
- The gauge sits at 34.23108, -113.60993, in Arizona, in hydrologic subbasin 15030204, at an elevation of about 954 feet, draining roughly 4,633 square miles.
- Can I use Bill Williams River below Alamo Dam, 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 Bill Williams River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Bill Williams River in full.
- Bill Williams River below Alamo Dam, AZ this page
- Bill Williams River near Parker, AZ 5,337 sq mi