Cowlitz River

Streamflow Hydrology Weather


Cowlitz River Levels

March 28 2024

41,653 ACRE-FT

Discharge Volume Today
+3060.0 cfs (+17.06%) since yesterday
96.61% of Normal 4 Streamgauges

Total streamflow across the Cowlitz River was last observed at 21,000 cfs, and is expected to yield approximately 41,653 acre-ft of water today; about 97% of normal. Average streamflow for this time of year is 21,738 cfs, with recent peaks last observed on 2020-02-07 when daily discharge volume was observed at 95,120 cfs.

Maximum discharge along the river is currently at the Cowlitz River At Castle Rock reporting a streamflow rate of 11,300 cfs. This is also the highest stage along the Cowlitz River, with a gauge stage of 35.57 ft at this location. This river is monitored from 4 different streamgauging stations along the Cowlitz River, the highest being situated at an altitude of 1,053 ft, the Cowlitz River At Packwood.

Last Updated 2024-03-28
Streamflow 21,000.0 cfs
Percent of Normal 96.61%
Maximum 95,120.0 cfs
2020-02-07

About the cowlitz river


The Cowlitz River is a 105-mile-long river in southwestern Washington, originating from the glaciers of Mount Rainier National Park. Historically, the river was used for fishing and transportation by indigenous peoples. Today, it is a major source of hydroelectric power, with several major dams and reservoirs along its course, including Mayfield Dam and Riffe Lake. These dams have greatly affected the river's hydrology and the surrounding agricultural land by controlling flooding and providing irrigation. The Cowlitz River is also a popular recreational destination, with opportunities for fishing, boating, and hiking in the surrounding forests and mountains. The river is home to several species of salmon and steelhead, and efforts are being made to restore and protect their populations.

Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Cowlitz River At Packwood
USGS 14226500
1420 cfs 1.46 ft 6.77
Cowlitz River At Randle
USGS 14231000
2890 cfs 6.64 ft 8.24
Cowlitz River Below Mayfield Dam
USGS 14238000
5390 cfs 11.65 ft 4.46
Cowlitz River At Castle Rock
USGS 14243000
11300 cfs 35.57 ft 28.7

Peak Annual Discharge

Cowlitz River Maximum Total Discharge

Seasonal Comparison

Cowlitz River Year Over Year Discharge


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