How high is the Chehalis River at Porter, WA right now?

The Chehalis River at Porter, WA is currently flowing at 949 cubic feet per second with a gage height of 31.84 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Chehalis River at Porter, WA normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 33th percentile compared to the long-term historical record at this gauge.

Is the Chehalis River at Porter, WA at flood stage?

No — the gage height is 16.16 feet below the NWS flood-stage threshold of 48.0 feet.

What is the historical median flow for the Chehalis River at Porter, WA on June 11?

The long-term median discharge for this date is 1,120 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 742 to 4,050 cfs.

Where is the Chehalis River at Porter, WA stream gauge located?

The Chehalis River at Porter, WA stream gauge is operated by the USGS in Grays Harbor County, WA on the Chehalis River. USGS site number 12031000 (coordinates 46.9393, -123.3143).

Chehalis River at Porter, WA

USGS Site No: 12031000 • Chehalis River • Grays Harbor County, WA

Chehalis River at Porter, WA on the Chehalis River is currently at 949 cfs (Normal — 33th percentile for this date) . Gage height: 31.84 ft.

Reading from 1 week ago

↑ Upstream on Chehalis River

Chehalis River Near Grand Mound, WA

949

CFS Discharge

31.84

Gage Height (ft)

Normal

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	742
25th	Low threshold	864
50th (Median)	Normal (median)	1,120	Today: 949 cfs
75th	High threshold	1,650
95th	Very High threshold	4,050

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	1,040	32.01
May 27, 2026	1,100	32.11
May 26, 2026	1,080	32.07
May 25, 2026	1,060	32.05
May 24, 2026	1,090	32.10
May 23, 2026	1,150	32.20
May 22, 2026	1,220	32.32
May 21, 2026	1,310	32.48
May 20, 2026	1,430	32.66
May 19, 2026	1,600	32.93
May 18, 2026	1,900	33.38
May 17, 2026	2,020	33.55
May 16, 2026	1,690	33.06
May 15, 2026	1,450	32.70
Apr 20, 2026	2,950	34.85
Apr 19, 2026	3,310	35.26
Apr 18, 2026	3,780	35.77
Apr 17, 2026	4,480	36.50
Apr 16, 2026	5,540	37.48
Apr 15, 2026	3,460	35.40
Apr 14, 2026	2,310	34.04
Apr 13, 2026	2,340	34.08
Apr 12, 2026	2,490	34.27
Apr 11, 2026	2,370	34.12
Apr 10, 2026	2,400	34.16
Apr 9, 2026	2,530	34.32
Apr 8, 2026	2,700	34.54
Apr 7, 2026	2,900	34.79
Apr 6, 2026	3,130	35.05
Apr 5, 2026	3,360	35.32

Station Information

USGS Site No: 12031000
State: WA
County: Grays Harbor County
Coordinates: 46.9393, -123.3143
Drainage Area: 1,294 mi²
Datum (ft): 0.0
HUC Code: 17100103

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 45.5 ft
Flood Stage: 48.0 ft
Moderate Flood: 50.0 ft
Major Flood: 52.0 ft

Currently 16.16 ft below flood stage.

Recent Extremes

Max discharge: 32,400 cfs

Dec 12, 2025
Min discharge: 237 cfs

Sep 20, 2025
Days at flood stage: 6

Computed from the local daily-values archive.

Nearby Gauges

Satsop River Near Satsop, WA
9.5 mi · 614 cfs

Normal
Wynoochee River Above Black Creek near Montesano, WA
16.8 mi · 292 cfs

Low
Chehalis River Near Grand Mound, WA
17.3 mi · 606 cfs

Normal
Deschutes River at East St Bridge at Tumwater, WA
20.0 mi · 179 cfs

Normal
Elk Creek Below Deer Creek Near Doty, WA
21.1 mi · 0 cfs

Unknown