Rivermatics

USGS Streamgage 11530000

Trinity River A Hoopa, CA

Trinity River A Hoopa, CA is USGS streamgage 11530000 in California, monitoring river discharge in hydrologic subbasin 18010211. It drains a watershed of about 2,853 square miles. Discharge records at this site go back to 1911. Typical flow runs near 1,181.9 cfs in July and 5,602.3 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
2,853 sq mi
Gauge elevation
279 ft
Subbasin (HUC-8)
18010211
Coordinates
41.04982, -123.67363
USGS site number
11530000
Records begin
1911-10-01 (115 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Trinity River A Hoopa, 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
1,367 1,436 1,520
1,326 1,431 1,538
1,259 1,418 1,550
1,196 1,405 1,558
1,119 1,379 1,558
1,020 1,340 1,541
971 1,304 1,523
916 1,264 1,507
897 1,235 1,489
866 1,221 1,473
822 1,189 1,450
831 1,175 1,432
850 1,168 1,427
837 1,155 1,433

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 63 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 1,542.9 5,886.8 24,761.3
February 2,274.5 6,445.9 22,337.9
March 2,759 7,191.3 19,293.5
April 2,506.7 5,602.3 13,753.3
May 2,234.8 4,493.5 10,321
June 1,227.2 2,304.3 5,929.7
July 715.7 1,181.9 2,551
August 497.9 749.3 1,233.9
September 460.1 703.5 1,089.1
October 490.8 706.8 1,321.3
November 653.3 1,180.9 5,871
December 919.3 3,115.5 17,041.9

All values in cubic feet per second (cfs).

Common questions

When does Trinity River A Hoopa, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 7,191.3 cfs, against 703.5 cfs in September, 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 Hoopa, CA?
It depends on the month. In January, half of days historically fall near 5,886.8 cfs, with the middle 80% of days between 1,542.9 and 24,761.3 cfs. The month-by-month table on this page gives the full range.
How long has Trinity River A Hoopa, CA been measured?
Discharge records at USGS site 11530000 begin in 1911, about 115 years, covering roughly 9,131 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 Hoopa, 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 Hoopa, CA?
The gauge sits at 41.04982, -123.67363, in California, in hydrologic subbasin 18010211, at an elevation of about 279 feet, draining roughly 2,853 square miles.
Can I use Trinity River A Hoopa, 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