Klamath River near Seiad Valley, CA

Gauge details

State

California

Drainage area

6,940 sq mi

Gauge elevation

1,314 ft

Subbasin (HUC-8)

18010206

Coordinates

41.85374, -123.23227

USGS site number

11520500

Records begin

1912-10-01 (114 years)

Rivermatics forecast

14-day flow outlook

14-day flow forecast

Based on observations through September 15 for Klamath River near Seiad Valley, 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.

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

All values in cubic feet per second (cfs).

Common questions

When does Klamath River near Seiad Valley, CA normally run highest?

April, on the long-term record. The median daily flow that month is about 5,106.3 cfs, against 1,236.8 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.

What is a normal flow for Klamath River near Seiad Valley, CA?

It depends on the month. In January, half of days historically fall near 3,549.4 cfs, with the middle 80% of days between 1,805.8 and 10,260.6 cfs. The month-by-month table on this page gives the full range.

How long has Klamath River near Seiad Valley, CA been measured?

Discharge records at USGS site 11520500 begin in 1912, about 114 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 Klamath River near Seiad Valley, 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 Klamath River near Seiad Valley, CA?

The gauge sits at 41.85374, -123.23227, in California, in hydrologic subbasin 18010206, at an elevation of about 1,314 feet, draining roughly 6,940 square miles.

Can I use Klamath River near Seiad Valley, 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 Klamath River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Klamath River in full.

• Klamath River at Keno, OR 3,920 sq mi
• Klamath River below John C.Boyle Pwrplnt, near Keno, OR 4,080 sq mi
• Klamath River below Iron Gate Dam, CA 4,630 sq mi
• Klamath River near Seiad Valley, CA this page
• Klamath River Ab Fall C near Copco, CA 8,000 sq mi
• Klamath River near Klamath, CA 12,100 sq mi
• Klamath River above Keno Dam, at Keno - Bottom
• Klamath River above Keno Dam, at Keno, OR
• Klamath River at Miller Island Boat Ramp-Bottom
• Klamath River at Miller Island Boat Ramp, OR
• Klamath River at Miller Island, near Midland, OR
• Klamath River below Keno Dam, at Keno, OR
• Klamath River near Klamath Falls, OR

Other gauges in this subbasin

• Klamath River below Keno Dam, at Keno, OR
• Klamath River at Keno, OR
• Klamath River below John C.Boyle Pwrplnt, near Keno, OR
• Klamath River Ab Fall C near Copco, CA
• Klamath River below Iron Gate Dam, CA
• Klamath River A Walker Br near Klamath River, CA