USGS Streamgage 11149400
Nacimiento River below Nacimiento Dam near Bradley, CA
Nacimiento River below Nacimiento Dam near Bradley, CA is USGS streamgage 11149400 in California, monitoring river discharge in hydrologic subbasin 18060005. It sits on the Nacimiento River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 329 square miles. Discharge records at this site go back to 1957. Typical flow runs near 397.6 cfs in July and 55.3 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
- California
- Drainage area
- 329 sq mi
- Gauge elevation
- 592 ft
- Subbasin (HUC-8)
- 18060005
- Coordinates
- 35.76136, -120.85546
- USGS site number
- 11149400
- Records begin
- 1957-10-01 (69 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Nacimiento River below Nacimiento Dam near Bradley, CA. 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 |
|---|---|---|---|---|
| 381 | 391 | 400 | ||
| 379 | 390 | 402 | ||
| 376 | 390 | 403 | ||
| 371 | 389 | 404 | ||
| 366 | 389 | 406 | ||
| 359 | 388 | 408 | ||
| 349 | 388 | 410 | ||
| 336 | 387 | 412 | ||
| 315 | 387 | 415 | ||
| 292 | 386 | 417 | ||
| 272 | 383 | 418 | ||
| 258 | 381 | 419 | ||
| 256 | 380 | 421 | ||
| 223 | 372 | 415 |
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 69 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 | 1 | 30 | 312 | |
| February | 1.6 | 31.9 | 2,052.3 | |
| March | 2.4 | 29.9 | 623.2 | |
| April | 5.4 | 55.3 | 388.4 | |
| May | 17.8 | 190.4 | 416.5 | |
| June | 52.1 | 333 | 438.9 | |
| July | 56.5 | 397.6 | 533.7 | |
| August | 37.9 | 411.2 | 547.7 | |
| September | 22.9 | 355.5 | 501.4 | |
| October | 14.6 | 168.3 | 389.2 | |
| November | 2.1 | 73.4 | 367.7 | |
| December | 0.4 | 44.5 | 184.9 |
All values in cubic feet per second (cfs).
Common questions
- When does Nacimiento River below Nacimiento Dam near Bradley, CA normally run highest?
- August, on the long-term record. The median daily flow that month is about 411.2 cfs, against 29.9 cfs in March, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Nacimiento River below Nacimiento Dam near Bradley, CA?
- It depends on the month. In January, half of days historically fall near 30 cfs, with the middle 80% of days between 1 and 312 cfs. The month-by-month table on this page gives the full range.
- How long has Nacimiento River below Nacimiento Dam near Bradley, CA been measured?
- Discharge records at USGS site 11149400 begin in 1957, about 69 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 Nacimiento River below Nacimiento Dam near Bradley, CA?
- 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 Nacimiento River below Nacimiento Dam near Bradley, CA?
- The gauge sits at 35.76136, -120.85546, in California, in hydrologic subbasin 18060005, at an elevation of about 592 feet, draining roughly 329 square miles.
- Can I use Nacimiento River below Nacimiento Dam near Bradley, CA 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 Nacimiento River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Nacimiento River in full.
- Nacimiento River below Sapaque C near Bryson, CA 162 sq mi
- Nacimiento River below Nacimiento Dam near Bradley, CA this page