Rivermatics

USGS Streamgage 11530500

Klamath River near Klamath, CA

Klamath River near Klamath, CA is USGS streamgage 11530500 in California, monitoring river discharge in hydrologic subbasin 18010209. It sits on the Klamath River, alongside 12 other gauges Rivermatics tracks on the same river. It drains a watershed of about 12,100 square miles. Discharge records at this site go back to 1861. Typical flow runs near 4,149.7 cfs in July and 22,280 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
12,100 sq mi
Gauge elevation
5 ft
Subbasin (HUC-8)
18010209
Coordinates
41.51093, -123.97948
USGS site number
11530500
Records begin
1861-12-01 (165 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Klamath River near Klamath, 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
3,196 3,274 3,355
3,179 3,288 3,397
3,154 3,287 3,433
3,123 3,279 3,461
3,095 3,271 3,478
3,061 3,259 3,482
3,026 3,246 3,493
2,992 3,230 3,499
2,958 3,222 3,513
2,919 3,205 3,506
2,942 3,240 3,618
2,907 3,219 3,571
2,899 3,216 3,589
2,875 3,207 3,611

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 64 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 7,221.6 20,306.5 71,829
February 9,390.3 22,396.6 66,444.8
March 10,648.4 24,971 61,558.1
April 9,848 22,280 45,813.3
May 8,093.2 16,903.2 33,854.8
June 4,644 9,191 19,653.3
July 2,686.1 4,149.7 7,404.5
August 2,077.7 2,943.2 4,297.4
September 2,109.3 2,926.3 4,089
October 2,378.7 3,525.5 6,942.6
November 3,203 6,539.3 26,675.3
December 4,741.3 13,675.8 61,096.8

All values in cubic feet per second (cfs).

Common questions

When does Klamath River near Klamath, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 24,971 cfs, against 2,926.3 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 Klamath River near Klamath, CA?
It depends on the month. In January, half of days historically fall near 20,306.5 cfs, with the middle 80% of days between 7,221.6 and 71,829 cfs. The month-by-month table on this page gives the full range.
How long has Klamath River near Klamath, CA been measured?
Discharge records at USGS site 11530500 begin in 1861, about 165 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 Klamath River near Klamath, 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 Klamath River near Klamath, CA?
The gauge sits at 41.51093, -123.97948, in California, in hydrologic subbasin 18010209, at an elevation of about 5 feet, draining roughly 12,100 square miles.
Can I use Klamath River near Klamath, 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.

Other gauges in this subbasin