Rivermatics

USGS Streamgage 11516530

Klamath River below Iron Gate Dam, CA

Klamath River below Iron Gate Dam, CA is USGS streamgage 11516530 in California, monitoring river discharge in hydrologic subbasin 18010206. It sits on the Klamath River, alongside 12 other gauges Rivermatics tracks on the same river. It drains a watershed of about 4,630 square miles. Discharge records at this site go back to 1960. Typical flow runs near 788 cfs in July and 2,053.7 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
4,630 sq mi
Gauge elevation
2,166 ft
Subbasin (HUC-8)
18010206
Coordinates
41.92788, -122.44417
USGS site number
11516530
Records begin
1960-10-01 (66 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Klamath River below Iron Gate Dam, 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
977 996 1,016
973 1,004 1,047
970 1,009 1,080
962 1,007 1,110
956 1,007 1,156
949 1,005 1,172
942 1,003 1,177
935 1,000 1,163
929 999 1,174
924 1,000 1,198
916 998 1,182
912 997 1,180
910 997 1,214
908 998 1,242

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 66 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 953.4 1,740 4,398.7
February 925.8 1,801 5,335.9
March 975.1 2,260.6 6,984.8
April 1,265.3 2,053.7 5,658.3
May 1,019 1,603.5 4,005.8
June 718.1 1,015 2,210.7
July 694.9 788 1,080.3
August 732.4 1,015.5 1,098.1
September 888.1 1,199 1,576
October 957.9 1,333.5 2,210.3
November 972.5 1,343 3,116.7
December 944.9 1,521.6 4,045.8

All values in cubic feet per second (cfs).

Common questions

When does Klamath River below Iron Gate Dam, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 2,260.6 cfs, against 788 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 Klamath River below Iron Gate Dam, CA?
It depends on the month. In January, half of days historically fall near 1,740 cfs, with the middle 80% of days between 953.4 and 4,398.7 cfs. The month-by-month table on this page gives the full range.
How long has Klamath River below Iron Gate Dam, CA been measured?
Discharge records at USGS site 11516530 begin in 1960, about 66 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 below Iron Gate Dam, 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 below Iron Gate Dam, CA?
The gauge sits at 41.92788, -122.44417, in California, in hydrologic subbasin 18010206, at an elevation of about 2,166 feet, draining roughly 4,630 square miles.
Can I use Klamath River below Iron Gate Dam, 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