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Chehalis River near Grand Mound

Critical Stages
138.5' - Action
141' - Flood
142.5' - Moderate
144' - Major

Latest Observation

Updated: 8:00 AM PST 12/6/25

Status: No Flooding

Stage: 133.04 ft

Flow: 3.53 kcfs

Forecast

TimeStage (ft)Flow (kcfs)
10 AM 12/6 133.06 3.55
4 PM 12/6 133.03 3.51
10 PM 12/6 132.99 3.46
4 AM 12/7 132.99 3.46
10 AM 12/7 133.02 3.5
4 PM 12/7 133.01 3.49
10 PM 12/7 132.98 3.45
4 AM 12/8 133.14 3.65
10 AM 12/8 133.53 4.17
4 PM 12/8 134.12 5
10 PM 12/8 135.05 6.44
4 AM 12/9 136.57 9.04
10 AM 12/9 138.22 12.2
4 PM 12/9 139.6 15.4
10 PM 12/9 140.57 18.1
4 AM 12/10 141.19 20
10 AM 12/10 141.61 21.4
4 PM 12/10 141.97 22.6
10 PM 12/10 142.17 23.9
4 AM 12/11 142.39 25.4
10 AM 12/11 142.66 27.3
4 PM 12/11 142.9 29.1
10 PM 12/11 143.01 30
4 AM 12/12 142.99 29.8
10 AM 12/12 142.89 29.1
4 PM 12/12 142.77 28.1
10 PM 12/12 142.64 27.2
4 AM 12/13 142.52 26.3
10 AM 12/13 142.38 25.3
4 PM 12/13 142.22 24.2
10 PM 12/13 142.03 22.9
4 AM 12/14 141.67 21.6
10 AM 12/14 141.21 20.1
4 PM 12/14 140.68 18.4
10 PM 12/14 140.1 16.8
4 AM 12/15 139.52 15.2
10 AM 12/15 138.9 13.7
4 PM 12/15 138.43 12.7
10 PM 12/15 138.13 12
4 AM 12/16 138.04 11.8
TimeStage (ft)Flow (kcfs)
8:00 AM 12/6 133.04 3.53
7:45 AM 12/6 133.04 3.53
7:30 AM 12/6 133.04 3.53
7:15 AM 12/6 133.03 3.51
7:00 AM 12/6 133.03 3.51
6:45 AM 12/6 133.03 3.51
6:30 AM 12/6 133.02 3.5
6:15 AM 12/6 133.02 3.5
6:00 AM 12/6 133.02 3.5
5:45 AM 12/6 133.02 3.5
5:30 AM 12/6 133.01 3.49
5:15 AM 12/6 133.01 3.49
5:00 AM 12/6 133.01 3.49
4:45 AM 12/6 133 3.48
4:30 AM 12/6 132.99 3.46
4:15 AM 12/6 132.99 3.46
4:00 AM 12/6 132.99 3.46
3:45 AM 12/6 132.98 3.45
3:30 AM 12/6 132.97 3.44
3:15 AM 12/6 132.97 3.44
3:00 AM 12/6 132.97 3.44
2:45 AM 12/6 132.96 3.42
2:30 AM 12/6 132.96 3.42
2:15 AM 12/6 132.95 3.41
2:00 AM 12/6 132.94 3.4
1:45 AM 12/6 132.94 3.4
1:30 AM 12/6 132.93 3.39
1:15 AM 12/6 132.92 3.37
1:00 AM 12/6 132.91 3.36
12:45 AM 12/6 132.9 3.34
Hydrograph for Chehalis River near Grand Mound
146' - 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.
144.5' - 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.
142.5' - 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' - 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.
139.5' - the Chehalis River in Thurston County will locally spill out of its banks into nearby fields and over a few roads.
DateStage (ft)
Dec 4, 2007 147.26
Jan 7, 2022 145.21
Jan 14, 2021 142.88
Dec 22, 2019 142.68
Jan 4, 2021 142.59
Mar 2, 2022 142.59
Jan 8, 2020 142.41
Dec 7, 2023 142.28
Nov 13, 2021 141.41
Jan 28, 2024 140.85
Dec 4, 2007 20.23
Feb 9, 1996 19.98
Jan 10, 1990 19.34
Nov 25, 1986 18.41
Dec 29, 1937 18.39
Jan 21, 1972 18.21
Jan 8, 2009 18.18
Nov 25, 1990 18.12
Dec 5, 1975 17.73
Apr 6, 1991 17.66

Data provided by the National Weather Service.