Rivermatics

USGS Streamgage 11525854

Trinity River A Douglas City, CA

Trinity River A Douglas City, CA is USGS streamgage 11525854 in California, monitoring river discharge in hydrologic subbasin 18010211. It drains a watershed of about 931 square miles. Discharge records at this site go back to 2002. Typical flow runs near 727.5 cfs in July and 983.6 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, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
California
Drainage area
931 sq mi
Gauge elevation
1,593 ft
Subbasin (HUC-8)
18010211
Coordinates
40.64528, -122.95667
USGS site number
11525854
Records begin
2002-10-01 (24 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Trinity River A Douglas City, 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.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
1,137 1,176 1,240
1,112 1,173 1,236
1,070 1,166 1,234
1,010 1,158 1,239
882 1,151 1,253
773 1,135 1,260
683 1,104 1,247
622 1,061 1,224
582 1,005 1,191
516 934 1,146
486 889 1,121
475 854 1,091
487 845 1,074
509 844 1,069

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 24 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 362.9 558.2 2,066.1
February 375.9 594.8 2,688.6
March 384.4 686.9 2,153.9
April 487.6 983.6 4,771.7
May 1,284.5 2,855.8 6,226.1
June 617.3 1,780.7 3,017.3
July 440.6 727.5 1,384.1
August 440.9 517.6 1,023.3
September 453.9 502.3 935
October 366.9 399.6 468
November 312.8 346.1 456.8
December 338.8 416 1,240.5

All values in cubic feet per second (cfs).

Common questions

When does Trinity River A Douglas City, CA normally run highest?
May, on the long-term record. The median daily flow that month is about 2,855.8 cfs, against 346.1 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Trinity River A Douglas City, CA?
It depends on the month. In January, half of days historically fall near 558.2 cfs, with the middle 80% of days between 362.9 and 2,066.1 cfs. The month-by-month table on this page gives the full range.
How long has Trinity River A Douglas City, CA been measured?
Discharge records at USGS site 11525854 begin in 2002, about 24 years, covering roughly 8,711 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Trinity River A Douglas City, 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. A companion model forecasts each day's water-temperature high and low. 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 Trinity River A Douglas City, CA?
The gauge sits at 40.64528, -122.95667, in California, in hydrologic subbasin 18010211, at an elevation of about 1,593 feet, draining roughly 931 square miles.
Can I use Trinity River A Douglas City, 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.

Other gauges in this subbasin