How high is the Chehalis River Near Grand Mound, WA right now?

The Chehalis River Near Grand Mound, WA is currently flowing at 606 cubic feet per second with a gage height of 129.79 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Chehalis River Near Grand Mound, WA normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 36th percentile compared to the long-term historical record at this gauge.

Is the Chehalis River Near Grand Mound, WA at flood stage?

No — the gage height is 11.21 feet below the NWS flood-stage threshold of 141.0 feet.

What is the historical median flow for the Chehalis River Near Grand Mound, WA on June 11?

The long-term median discharge for this date is 708 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 429 to 2,960 cfs.

Where is the Chehalis River Near Grand Mound, WA stream gauge located?

The Chehalis River Near Grand Mound, WA stream gauge is operated by the USGS in Thurston County, WA on the Chehalis River. USGS site number 12027500 (coordinates 46.7759, -123.0357).

Chehalis River Near Grand Mound, WA

USGS Site No: 12027500 • Chehalis River • Thurston County, WA

Chehalis River Near Grand Mound, WA on the Chehalis River is currently at 606 cfs (Normal — 36th percentile for this date) . Gage height: 129.79 ft.

Reading from 1 week ago

↑ Upstream on Chehalis River

Chehalis River Near Adna, WA

Downstream on Chehalis River ↓

Chehalis River at Porter, WA

606

CFS Discharge

129.79

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	429
25th	Low threshold	529
50th (Median)	Normal (median)	708	Today: 606 cfs
75th	High threshold	986
95th	Very High threshold	2,960

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	649	129.87
May 27, 2026	703	129.97
May 26, 2026	677	129.92
May 25, 2026	638	129.85
May 24, 2026	653	129.88
May 23, 2026	686	129.94
May 22, 2026	739	130.03
May 21, 2026	810	130.15
May 20, 2026	878	130.26
May 19, 2026	992	130.43
May 18, 2026	1,220	130.73
May 17, 2026	1,480	131.06
May 16, 2026	1,140	130.62
May 15, 2026	899	130.29
Apr 20, 2026	—	131.57
Apr 19, 2026	2,080	131.87
Apr 18, 2026	2,480	132.23
Apr 17, 2026	3,110	132.72
Apr 16, 2026	4,160	133.52
Apr 15, 2026	3,040	132.55
Apr 14, 2026	1,160	130.85
Apr 13, 2026	1,220	130.93
Apr 12, 2026	1,420	131.17
Apr 11, 2026	1,260	130.98
Apr 10, 2026	1,260	130.98
Apr 9, 2026	1,330	131.07
Apr 8, 2026	1,450	131.21
Apr 7, 2026	1,600	131.37
Apr 6, 2026	1,760	131.55
Apr 5, 2026	1,940	131.73

Station Information

USGS Site No: 12027500
State: WA
County: Thurston County
Coordinates: 46.7759, -123.0357
Drainage Area: 895 mi²
Datum (ft): 0.0
HUC Code: 17100103

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 138.5 ft
Flood Stage: 141.0 ft
Moderate Flood: 142.5 ft
Major Flood: 144.0 ft

Currently 11.21 ft below flood stage.

Recent Extremes

Max discharge: 31,500 cfs

Dec 11, 2025
Min discharge: 119 cfs

Sep 20, 2025
Days at flood stage: 6

Computed from the local daily-values archive.

Nearby Gauges

Skookumchuck River Near Bucoda, WA
5.3 mi · 126 cfs

Normal
Chehalis River Near Adna, WA
10.8 mi · 601 cfs

Very High
Newaukum River Near Chehalis, WA
11.6 mi · 139 cfs

Normal
Skookumchuck River below Bldy Run Creek near Centralia, WA
14.2 mi · 103 cfs

Low
Nf Newaukum River Above Bear Creek Near Forest, WA
14.6 mi · 0 cfs

Unknown