Chehalis River at Porter water level

Name: Chehalis River at Porter water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Chehalis River, Washington, United States

Directions

High for mid-October

Water level

30.58ft Steady over the last 24 hours

Measured Oct 17, 2026, 06:45 AM PDT (2 hours ago)

Flow: 350 cfs

History

7 days 30 days 1 year Years compared

20252026

Water level Normal range (10–90 %) Forecast Minor flood stage

The forecast expects the river to fall to 30.42 ft by Wednesday, October 21 at 11:00 PM. Issued Friday, October 16 at 09:12 AM by NOAA National Weather Service.

What this means

High water at Chehalis River at Porter: the latest reading is 30.58 ft, above normal for mid-October.

The median for mid-October is 4.74 ft, based on 35 years of readings, so the river stage is 25.84 ft above typical. It is 17.42 ft below the flood stage of 48.00 ft. On the same day last year the reading was 30.33 ft, a difference of +0.25 ft.

It has barely moved over the past 24 hours. The forecast expects the river to fall to 30.42 ft by Wednesday, October 21 at 11:00 PM. The 30-day range is 30.53 ft – 31.27 ft.

Compared with 35 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 4.74 ft25.84 ft above the median for this date
Normal for this date: 3.19 ft – 30.86 ft8 years in 10 fall in this range (35 years of records)
Same day last year: 30.33 ft+0.25 ft
Lowest and highest in 30 days: 30.53 ft – 31.27 ft
Lowest and highest in 12 months: 30.33 ft – 49.46 ft
Highest on record: 53.17 ftDecember 5, 2007
Forecast peak: 30.49 ftSaturday, October 17 at 05:00 AM

Paddling and fishing conditions

Above-normal flows push fish to the edges and make wading risky. Wait for the river to drop and clear.

For reference, flood stage is 48.00 ft.

What happens at each level

52.00 ft: the Chehalis River in Grays Harbor will cause major near record flooding from Oakville downstream to Grays Harbor. Deep and swift flood waters will inundate numerous farms and roads...including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Chehalis River Basin.
50.00 ft: feet...the Chehalis River in Grays Harbor will flood numerous farms and roads including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
49.00 ft: the Chehalis River in Grays Harbor will flood pasture lands and many roads...including SR 12 between Oakville and Rochester. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
48.00 ft: the Chehalis River in Grays Harbor will flood low pasture lands and some roads. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
46.00 ft: the Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.
30.58 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Chance of at least minor flooding in October to December: 24 %.

Rank	Level	Date
1	53.17 ft	December 5, 2007
2	52.01 ft	January 8, 2022
3	49.64 ft	December 12, 2025
4	49.18 ft	January 15, 2021
5	48.99 ft	January 9, 2020
6	48.79 ft	March 3, 2022
7	48.58 ft	December 23, 2019
8	48.54 ft	December 8, 2023
9	48.36 ft	January 13, 2022
10	48.15 ft	November 14, 2021

Weather at the gauge

No rain in the last 3 days.

17 Sat 62° 46° 0.03 in, 51% Wind 9 mph

18 Sun 61° 39° – Wind 7 mph

19 Mon 61° 42° – Wind 3 mph

20 Tue 62° 40° – Wind 7 mph

21 Wed 68° 41° – Wind 4 mph

22 Thu 55° 43° – Wind 11 mph

23 Fri 60° 38° – Wind 8 mph

Forecast: Open-Meteo

Sunrise 07:35 AM Sunset 06:24 PM Daylight 10 hr, 49 min First quarter 41%

Map

Other gauges on the Chehalis River

Gauge	Level	Compared with normal	24 hours	Distance
Chehalis River near DotyRiver gauge, Chehalis River	306.11 ft	High	±0	22 mi
Chehalis River near AdnaRiver gauge, Chehalis River	192.86 ft	High	±0	24 mi
Chehalis River at Wwtp at ChehalisRiver gauge, Chehalis River	152.02 ft	No reference yet	+0.02 ft	25 mi
Chehalis River near Grand MoundRiver gauge, Chehalis River	128.89 ft	High	+0.05 ft	17 mi
Chehalis River near RochesterRiver gauge, Chehalis River	103.92 ft	No reference yet	+0.05 ft	13 mi
Chehalis River near MontesanoRiver gauge, Chehalis River	6.60 ft	Very high	+0.67 ft	14 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Satsop River near SatsopRiver gauge, Satsop River	27.79 ft	High	−0.01 ft	10 mi
Wynoochee River above Black Creek near MontesanoRiver gauge, Wynoochee River	27.07 ft	High	−0.01 ft	17 mi
Deschutes River at East St Bridge at TumwaterRiver gauge, Deschutes River	24.48 ft	Low	−0.02 ft	20 mi
Goldsborough Creek above 7th Street at SheltonRiver gauge, Goldsborough Creek	35.1 cfs	Very low	+1.1 cfs	21 mi
Skookumchuck River near BucodaRiver gauge, Skookumchuck River	203.69 ft	Below flood stage	+0.07 ft	22 mi
Willapa River near WillapaRiver gauge, Willapa River	2.89 ft	Below flood stage	+0.01 ft	26 mi

Questions and answers

Is the Chehalis River at Porter higher than last year?

Yes, it is 0.25 ft higher than on the same day last year, when the reading was 30.33 ft.

What is flood stage for the Chehalis River at Porter?

The official flood stage is 48.00 ft. The level is currently 17.42 ft below it.

What is a normal level for the Chehalis River at Porter in mid-October?

The median for mid-October is 4.74 ft. In 8 years out of 10 the reading falls between 3.19 ft and 30.86 ft, based on 35 years of records.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Chehalis River at Porter today?

On Oct 17, 2026, 06:45 AM PDT, the water level was 30.58 ft. Steady over the last 24 hours.

Is Chehalis River at Porter rising or falling?

Steady over the last 24 hours. Steady over the last 7 days.

Is the level of Chehalis River at Porter normal?

High for mid-October. Compared with 35 years of daily readings for this time of year.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:12031000 (Agency page)
Coordinates: 46.93926, -123.31432 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	30.58 ft	2026-10-17 13:45	Provisional
Flow	350 cfs	2026-10-17 13:45	Provisional

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How to cite

U.S. Geological Survey: Chehalis River at Porter (usgs:12031000). Accessed October 17, 2026 via Nivelmap, https://nivelmap.com/en/united-states/washington/chehalis-river-at-porter

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer