USGS Streamgage 11123500
Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA
Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA is USGS streamgage 11123500 in California, monitoring river discharge in hydrologic subbasin 18060010. It sits on the Santa Ynez River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 277 square miles. Discharge records at this site go back to 1947. Typical flow runs near 0 cfs in July and 11.9 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
- California
- Drainage area
- 277 sq mi
- Gauge elevation
- 797 ft
- Subbasin (HUC-8)
- 18060010
- Coordinates
- 34.54359, -119.86483
- USGS site number
- 11123500
- Records begin
- 1947-05-13 (79 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Santa Ynez River below Los Laurls Cyn near Snta Ynez, 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 |
|---|---|---|---|---|
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 | ||
| 0 | 0 | 0.1 |
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 79 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 | 0 | 1.5 | 245.3 | |
| February | 0 | 9.5 | 713.5 | |
| March | 0 | 18.9 | 819.9 | |
| April | 0 | 11.9 | 408.4 | |
| May | 0 | 3.9 | 120.3 | |
| June | 0 | 0.2 | 39.8 | |
| July | 0 | 0 | 8.6 | |
| August | 0 | 0 | 4.3 | |
| September | 0 | 0 | 2 | |
| October | 0 | 0 | 0.8 | |
| November | 0 | 0 | 1.7 | |
| December | 0 | 0 | 33.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 18.9 cfs, against 0 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA?
- It depends on the month. In January, half of days historically fall near 1.5 cfs, with the middle 80% of days between 0 and 245.3 cfs. The month-by-month table on this page gives the full range.
- How long has Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA been measured?
- Discharge records at USGS site 11123500 begin in 1947, about 79 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 Santa Ynez River below Los Laurls Cyn near Snta Ynez, 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 Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA?
- The gauge sits at 34.54359, -119.86483, in California, in hydrologic subbasin 18060010, at an elevation of about 797 feet, draining roughly 277 square miles.
- Can I use Santa Ynez River below Los Laurls Cyn near Snta Ynez, 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 Santa Ynez River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Santa Ynez River in full.
- Santa Ynez River below Gibraltar Dam near Santa Barbara, CA 216 sq mi
- Santa Ynez River below Los Laurls Cyn near Snta Ynez, CA this page
- Santa Ynez River near Santa Ynez, CA 422 sq mi