Rivermatics

USGS Streamgage 12020800

South Fork Chehalis River near Wildwood, WA

South Fork Chehalis River near Wildwood, WA is USGS streamgage 12020800 in Washington, monitoring river discharge in hydrologic subbasin 17100103. It drains a watershed of about 27 square miles. Discharge records at this site go back to 1996.

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Gauge details

State
Washington
Drainage area
27 sq mi
Gauge elevation
366 ft
Subbasin (HUC-8)
17100103
Coordinates
46.44483, -123.08374
USGS site number
12020800
Records begin
1996-02-08 (30 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 27 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Only 8 of 12 months have enough record to summarize; the rest are omitted.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 83.2 193.8 866.6
February 74.4 132.9 486.1
March 71 140.2 410
April 51.9 105.5 245.2
May — 37 —
October 6.5 20.4 118.3
November 28 125.2 624.8
December 56.5 185.9 725

All values in cubic feet per second (cfs).

Common questions

When does South Fork Chehalis River near Wildwood, WA normally run highest?
January, on the long-term record. The median daily flow that month is about 193.8 cfs, against 20.4 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for South Fork Chehalis River near Wildwood, WA?
It depends on the month. In January, half of days historically fall near 193.8 cfs, with the middle 80% of days between 83.2 and 866.6 cfs. The month-by-month table on this page gives the full range.
How long has South Fork Chehalis River near Wildwood, WA been measured?
Discharge records at USGS site 12020800 begin in 1996, about 30 years, covering roughly 5,270 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is South Fork Chehalis River near Wildwood, WA?
The gauge sits at 46.44483, -123.08374, in Washington, in hydrologic subbasin 17100103, at an elevation of about 366 feet, draining roughly 27 square miles.
Can I use South Fork Chehalis River near Wildwood, WA data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other gauges in this subbasin