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SwedenChehalis River near Grand Mound water level
River gauge, Chehalis River, Washington, United States
Right now
High for mid-October
Water level
- Flow
- 246 cfs
History
20252026
The forecast expects the river to fall to 128.77 ft by Monday, October 26 at 05:00 PM. Issued Sunday, October 18 at 08:47 AM by NOAA National Weather Service.
What this means
High water at Chehalis River near Grand Mound: the latest reading is 128.86 ft, above normal for mid-October.
That puts it 125.31 ft above the median of 3.55 ft for mid-October, based on 40 years of readings. It is 12.14 ft below the flood stage of 141.00 ft. A year ago it stood at 128.78 ft (+0.08 ft).
The level has held steady over the past 24 hours. The forecast expects the river to fall to 128.77 ft by Monday, October 26 at 05:00 PM. The 30-day range is 128.77 ft – 129.52 ft.
Compared with 40 years of daily readings for this time of year. How to read levels
Key numbers
- Median for this date
- 3.55 ft125.31 ft above the median for this date
- Normal for this date
- 2.19 ft – 130.21 ft8 years in 10 fall in this range (40 years of records)
- Same day last year
- 128.78 ft+0.08 ft
- Lowest and highest in 30 days
- 128.77 ft – 129.52 ft
- Lowest and highest in 12 months
- 128.75 ft – 143.19 ft
- Highest on record
- 147.26 ftDecember 4, 2007
- Forecast peak
- 128.87 ftSunday, October 18 at 11:00 PM
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 141.00 ft.
What happens at each level
- 146.00 ft
- the Chehalis River in Thurston County will cause severe near record flooding, with deep and swift flood waters inundating the Independence Valley. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Chehalis River Basin.
- 144.50 ft
- the Chehalis River in Thurston County will cause major flooding, inundating roads and farm lands in Independence Valley. Deep and swift flood waters will cover SR-12 and James, Independence and Moon Roads. Flooding will occur all along the river including headwaters, tributaries, and other streams within and near the Chehalis River Basin.
- 142.50 ft
- the Chehalis River in Thurston County will flood several roads in Independence Valley with swiftly moving water including SR-12 and James, Independence, Moon and Anderson Roads. Flood waters will cut off access to and from Chehalis Reservation and inundate nearby farm lands. Some residential structures may be threatened.
- 141.00 ft
- the Chehalis River in Thurston County will flood several roads in Independence Valley including James Road, Independence Road, and Moon road. Flood waters will also cover nearby farm lands.
- 139.50 ft
- the Chehalis River in Thurston County will locally spill out of its banks into nearby fields and over a few roads.
- 128.86 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: 29 %.
| Rank | Level | Date |
|---|---|---|
| 1 | 147.26 ft | December 4, 2007 |
| 2 | 145.21 ft | January 7, 2022 |
| 3 | 143.27 ft | December 11, 2025 |
| 4 | 142.88 ft | January 14, 2021 |
| 5 | 142.68 ft | December 22, 2019 |
| 6 | 142.59 ft | March 2, 2022 |
| 7 | 142.59 ft | January 4, 2021 |
| 8 | 142.41 ft | January 8, 2020 |
| 9 | 142.28 ft | December 7, 2023 |
| 10 | 141.41 ft | November 13, 2021 |
Weather at the gauge
No rain in the last 3 days.
Forecast: Open-Meteo
Map
Other gauges on the Chehalis River
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Chehalis River near DotyRiver gauge, Chehalis River | 306.10 ft | High | −0.01 ft | 16 mi |
| Chehalis River near AdnaRiver gauge, Chehalis River | 192.86 ft | High | −0.01 ft | 11 mi |
| Chehalis River at Wwtp at ChehalisRiver gauge, Chehalis River | 152.03 ft | No reference yet | +0.01 ft | 8 mi |
| Chehalis River near RochesterRiver gauge, Chehalis River | 103.91 ft | Very low | +0.01 ft | 4.5 mi |
| Chehalis River at PorterRiver gauge, Chehalis River | 30.59 ft | High | +0.01 ft | 17 mi |
| Chehalis River near MontesanoRiver gauge, Chehalis River | 3.34 ft | Very low | −0.34 ft | 30 mi |
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Skookumchuck River near BucodaRiver gauge, Skookumchuck River | 203.69 ft | Below flood stage | −0.01 ft | 5.3 mi |
| Newaukum River near ChehalisRiver gauge, Newaukum River | 192.51 ft | Below flood stage | +0.14 ft | 12 mi |
| Skookumchuck River below Bldy Run Creek near CentraliaRiver gauge, Skookumchuck River | 325.99 ft | Highest on record | ±0 | 14 mi |
| Nf Newaukum River above Bear Creek near ForestRiver gauge, Nf Newaukum River | 404.83 ft | High | +0.01 ft | 15 mi |
| Elk Creek below Deer Creek near DotyRiver gauge, Elk Creek | 19.4 cfs | Low | ±0 | 16 mi |
| Deschutes River at East St Bridge at TumwaterRiver gauge, Deschutes River | 24.49 ft | Low | +0.01 ft | 17 mi |
Questions and answers
How does the Chehalis River near Grand Mound compare with last year?
It is 0.08 ft higher than on the same day last year, when the reading was 128.78 ft.
What is flood stage for the Chehalis River near Grand Mound?
The official flood stage is 141.00 ft. The level is currently 12.14 ft below it.
What is a normal level for the Chehalis River near Grand Mound in mid-October?
The median for mid-October is 3.55 ft. In 8 years out of 10 the reading falls between 2.19 ft and 130.21 ft, based on 40 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 near Grand Mound today?
On Oct 18, 2026, 01:00 PM PDT, the water level was 128.86 ft. Steady over the last 24 hours.
Is Chehalis River near Grand Mound rising or falling?
Steady over the last 24 hours. Down 0.05 ft over the last 7 days.
Is the level of Chehalis River near Grand Mound normal?
High for mid-October. Compared with 40 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:12027500(Agency page)- Coordinates
46.77593, -123.03569(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 | 128.86 ft | 2026-10-18 20:00 | Provisional |
| Flow | 246 cfs | 2026-10-18 20:00 | Provisional |
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How to cite
U.S. Geological Survey: Chehalis River near Grand Mound (usgs:12027500). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/washington/chehalis-river-near-grand-mound
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