USGS 12031000 CHEHALIS RIVER AT PORTER, WA
Location.--Latitude 46°56'22", Longitude
123°18'47", SW 1/4 SE 1/4 Section 21, Township 17 North, Range
5 West, in Grays Harbor County, Hydrologic Unit 17100103, at
downstream end of left bank bridge pier, 30 feet downstream from Porter
Creek, 0.1 mile west of Porter, and at river mile
area is 1,294 mi2. Datum of
the gage is NAVD of 1988. Prior to May 10, 2018, datum of the gage was
NVGD of 1929.
this station on a
map of the basin (PDF).
Additional Data and Information.-- Latest shifted
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:
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
Boating safety tips
This station managed by the Western Washington Field Office (Tacoma).
Summary of all available data for this site
Instantaneous-data availability statement
Most recent instantaneous value: 3260 04-01-2023 09:45 PDT
Daily discharge, cubic feet per second -- statistics for Apr 1 based on 67 water years of record more
|Most Recent |
Value Apr 1
|Median ||Mean ||75th |
|1160 ||3110 ||3260 ||4540 ||6220 ||8160 ||23000
Most recent instantaneous value: 35.03 04-01-2023 09:45 PDT
Most recent instantaneous value: 4.3 04-01-2023 09:45 PDT