USGS 12031000 CHEHALIS RIVER AT PORTER, 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:

Station Notes
gage
Gage height datum conversion to the NAVD88 datum for this streamgage was completed on May 10, 2018. All reported gage heights and those associated with discharge measurements and stage-discharge ratings have been converted and are consistent with elevations based on the NAVD88 datum. A conversion factor of 27.11 ft was used to convert the old gage heights to the currently reported instantaneous gage height, discharge measurement gage heights, and stage-discharge rating points.

Boating safety tips

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

Available Parameters Available Period
  
1989-10-01  2025-07-06
1990-02-22  2025-07-06
2018-12-13  2024-10-01







 (7)
 
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Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second
Most recent instantaneous value: 343 07-06-2025   04:45 PDT
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Jul 6 based on 70 water years of record more
Most Recent
Instantaneous
Value Jul 6		 Min
(2015)		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(1984)
343 388 573 708 740 888 1370

Gage height, feet, [NAVD 1988 as of 5/10/2018]
Most recent instantaneous value: 30.59 07-06-2025   04:45 PDT
Graph of Gage height, feet, [NAVD 1988 as of 5/10/2018]

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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)
 
-- Data temporarily unavailable for the time period specified --