USGS 14243000 COWLITZ RIVER AT CASTLE ROCK, WA

PROVISIONAL DATA SUBJECT TO REVISION

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Additional Data and Information.-- Latest shifted rating.

Flood Stage.--The National Weather Service Flood Stage for this station is 48.0 feet.

Funding for this site is provided by the cooperators / programs below:

Boating safety tips

This station managed by the Western Washington Field Office (Tacoma).

Available Parameters Available Period
  
1961-12-20  2026-08-01
2007-10-01  2026-08-01
2008-10-01  2026-08-01
2020-10-29  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01
2023-08-01  2026-08-01







 (7)
 
  -- or --

 

 
Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second
Most recent instantaneous value: 3580 08-01-2026   10:30 PDT
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Daily discharge, cubic feet per second -- statistics for Aug 1 based on 84 water years of record more
Min
(1941)		 25th
percen-
tile		 Median Most Recent
Instantaneous
Value Aug 1		 Mean 75th
percen-
tile		 Max
(1985)
1900 2840 3220 3580 3810 4470 8150

Gage height, feet, [NAVD 1988, feet]
Most recent instantaneous value: 33.52 08-01-2026   10:30 PDT
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Stream water level elevation above NAVD 1988, in feet
Most recent instantaneous value: 33.52 08-01-2026   10:30 PDT
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Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), RIGHT BANK, [Analite NEP5000]
Most recent instantaneous value: 2.3 08-01-2026   10:20 PDT
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Water velocity reading from field sensor, feet per second, RIGHT BANK, [from ADVM 1500kHz]
Most recent instantaneous value: 1.65 08-01-2026   10:15 PDT
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Water velocity reading from field sensor, feet per second, RIGHT BANK, [from ADVM 500kHz]
Most recent instantaneous value: 1.62 08-01-2026   10:15 PDT
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Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Suspended Load, Fines]
Most recent instantaneous value: 53.2 08-01-2026   10:15 PDT
Graph of Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Suspended Load, Fines]

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Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Suspended Load, Sands]
Most recent instantaneous value: 76.0 08-01-2026   10:15 PDT
Graph of Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Suspended Load, Sands]

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Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Total Suspended Load, Sands an]
Most recent instantaneous value: 148 08-01-2026   10:15 PDT
Graph of Suspended sediment load, water, unfiltered, computed, the product of regression-computed suspended sediment concentration and streamflow, short tons per day, [Total Suspended Load, Sands an]

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Upper 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Suspended Fines]
Most recent instantaneous value: 22.3 08-01-2026   10:15 PDT
Graph of Upper 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Suspended Fines]

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Upper 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Suspended Sands]
Most recent instantaneous value: 29.0 08-01-2026   10:15 PDT
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Upper 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Total SSC, Sands and Fines]
Most recent instantaneous value: 39.6 08-01-2026   10:15 PDT
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Lower 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Suspended Fines]
Most recent instantaneous value: 1.4 08-01-2026   10:15 PDT
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Lower 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Suspended Sands]
Most recent instantaneous value: 2.1 08-01-2026   10:15 PDT
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Lower 90 percent prediction limit for SSC by regression (PCODE 99409), milligrams per liter, [Total SSC, Sands and Fines]
Most recent instantaneous value: 5.9 08-01-2026   10:15 PDT
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Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Suspended Fines]
Most recent instantaneous value: 5.5 08-01-2026   10:15 PDT
Graph of Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Suspended Fines]

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Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Suspended Sands]
Most recent instantaneous value: 7.9 08-01-2026   10:15 PDT
Graph of Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Suspended Sands]

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Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Total SSC, Sands and Fines]
Most recent instantaneous value: 15.2 08-01-2026   10:15 PDT
Graph of Suspended sediment concentration, water, unfiltered, estimated by regression equation, milligrams per liter, [Total SSC, Sands and Fines]

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