Rivermatics

USGS Streamgage 14233500

Cowlitz River near Kosmos, WA

Cowlitz River near Kosmos, WA is USGS streamgage 14233500 in Washington, monitoring river discharge in hydrologic subbasin 17080005. It sits on the Cowlitz River, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,040 square miles. Discharge records at this site go back to 1947. Typical flow runs near 3,034.8 cfs in July and 5,122.7 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.

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Gauge details

State
Washington
Drainage area
1,040 sq mi
Subbasin (HUC-8)
17080005
Coordinates
46.46622, -122.10899
USGS site number
14233500
Records begin
1947-10-01 (79 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Cowlitz River near Kosmos, WA. 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
598 647 699
655 833 1,260
762 1,054 1,582
743 1,026 1,553
684 907 1,333
651 856 1,287
625 813 1,212
610 788 1,184
600 766 1,137
584 735 1,051
565 709 987
561 701 956
587 738 1,005
580 733 997

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 78 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 2,152.6 4,591.3 11,783.9
February 2,162.1 4,230.3 10,797.6
March 2,414.5 3,908.4 8,426.8
April 3,164.3 5,122.7 9,162.7
May 4,423.5 7,108.1 12,399
June 3,518 6,282 11,195
July 1,855.5 3,034.8 6,662.3
August 1,113.6 1,614.2 2,878.1
September 903.9 1,269.3 2,078.7
October 791.5 1,449 4,350.3
November 1,397.2 3,737.7 10,410.3
December 1,996.8 4,482.6 11,787.1

All values in cubic feet per second (cfs).

Common questions

When does Cowlitz River near Kosmos, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 7,108.1 cfs, against 1,269.3 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 Cowlitz River near Kosmos, WA?
It depends on the month. In January, half of days historically fall near 4,591.3 cfs, with the middle 80% of days between 2,152.6 and 11,783.9 cfs. The month-by-month table on this page gives the full range.
How long has Cowlitz River near Kosmos, WA been measured?
Discharge records at USGS site 14233500 begin in 1947, about 79 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Cowlitz River near Kosmos, WA?
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 Cowlitz River near Kosmos, WA?
The gauge sits at 46.46622, -122.10899, in Washington, in hydrologic subbasin 17080005, draining roughly 1,040 square miles.
Can I use Cowlitz River near Kosmos, WA 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 Cowlitz River

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

Other gauges in this subbasin