Location.--Latitude 46°39'40", Longitude
122°58'58", in NE 1/4 NW 1/4 Section 31, Township 14 North,
Range 2 West, in Lewis County, Hydrologic Unit 17100103, on
right bank at City of Chehalis wastewater treatment plant, 0.4 mile
downstream from State Highway 6 bridge, and at river mile
74.3. Drainage
area is 618 mi2. Datum of
the gage is NAVD of 1988. Prior to May 3, 2018, datum of the gage was
NVGD of 1929.
Maps.--Locate
this station on a
map of the basin (PDF).
Additional Data and Information.--Station data
inventory and annual data
report.
Flood Stage.--The National Weather Service has not
established a Flood
Stage for this station.
Funding for this site is provided by the
cooperators / programs below:
The
15-minute precipitation data for this station are
temporary and will only be displayed for 120 days. Time
series of 15-minute or cumulative daily values will NOT be
available for retrieval following the 120-day display period.
Although the instrumentation is calibrated at least once/year,
the temporary classification means that documented routine
inspections and other quality assurance measures are not
performed that would make the data acceptable for archival,
retrieval, or future use in general scientific or interpretive
studies.
This station is operated
seasonally,
from October 1 to April 30.
This is an elevation/stage
only station.
Gage height datum conversion to
the NAVD88 datum for this streamgage was completed on May 3, 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 3.75 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.
![Graph of Gage height, feet, [NAVD 1988 as of 5/3/2018]](https://natwebsdww02.cr.usgs.gov/nwisweb/data/img/USGS.12025100.150586.00065..20200222.20200229..0..gif)
