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Hydrograph River at a Glance Download
Chehalis River near Grand Mound Stage (ft)Flow (kcfs)Observed: 132.68 ft at 2:45AM May 13, 2022Observed: 132.68 ft at 3:00AM May 13, 2022Observed: 132.69 ft at 3:15AM May 13, 2022Observed: 132.7 ft at 3:30AM May 13, 2022Observed: 132.7 ft at 3:45AM May 13, 2022Observed: 132.71 ft at 4:00AM May 13, 2022Observed: 132.72 ft at 4:15AM May 13, 2022Observed: 132.72 ft at 4:30AM May 13, 2022Observed: 132.73 ft at 4:45AM May 13, 2022Observed: 132.74 ft at 5:00AM May 13, 2022Observed: 132.74 ft at 5:15AM May 13, 2022Observed: 132.75 ft at 5:30AM May 13, 2022Observed: 132.76 ft at 5:45AM May 13, 2022Observed: 132.76 ft at 6:00AM May 13, 2022Observed: 132.77 ft at 6:15AM May 13, 2022Observed: 132.77 ft at 6:30AM May 13, 2022Observed: 132.77 ft at 6:45AM May 13, 2022Observed: 132.78 ft at 7:00AM May 13, 2022Observed: 132.78 ft at 7:15AM May 13, 2022Observed: 132.78 ft at 7:30AM May 13, 2022Observed: 132.79 ft at 7:45AM May 13, 2022Observed: 132.79 ft at 8:00AM May 13, 2022Observed: 132.8 ft at 8:15AM May 13, 2022Observed: 132.8 ft at 8:30AM May 13, 2022Observed: 132.8 ft at 8:45AM May 13, 2022Observed: 132.8 ft at 9:00AM May 13, 2022Observed: 132.8 ft at 9:15AM May 13, 2022Observed: 132.8 ft at 9:30AM May 13, 2022Observed: 132.8 ft at 9:45AM May 13, 2022Observed: 132.8 ft at 10:00AM May 13, 2022Observed: 132.8 ft at 10:15AM May 13, 2022Observed: 132.8 ft at 10:30AM May 13, 2022Observed: 132.8 ft at 10:45AM May 13, 2022Observed: 132.8 ft at 11:00AM May 13, 2022Highest Observation: 132.81 ft at 11:15AM May 13, 2022Highest Observation: 132.81 ft at 11:30AM May 13, 2022Observed: 132.8 ft at 11:45AM May 13, 2022Observed: 132.8 ft at 12:00PM May 13, 2022Observed: 132.8 ft at 12:15PM May 13, 2022Observed: 132.8 ft at 12:30PM May 13, 2022Observed: 132.8 ft at 12:45PM May 13, 2022Observed: 132.8 ft at 1:00PM May 13, 2022Observed: 132.79 ft at 1:15PM May 13, 2022Observed: 132.79 ft at 1:30PM May 13, 2022Observed: 132.79 ft at 1:45PM May 13, 2022Observed: 132.78 ft at 2:00PM May 13, 2022Observed: 132.78 ft at 2:15PM May 13, 2022Observed: 132.78 ft at 2:30PM May 13, 2022Observed: 132.78 ft at 2:45PM May 13, 2022Observed: 132.78 ft at 3:00PM May 13, 2022Observed: 132.77 ft at 3:15PM May 13, 2022Observed: 132.77 ft at 3:30PM May 13, 2022Observed: 132.77 ft at 3:45PM May 13, 2022Observed: 132.76 ft at 4:00PM May 13, 2022Observed: 132.76 ft at 4:15PM May 13, 2022Observed: 132.76 ft at 4:30PM May 13, 2022Observed: 132.76 ft at 4:45PM May 13, 2022Observed: 132.76 ft at 5:00PM May 13, 2022Observed: 132.75 ft at 5:15PM May 13, 2022Observed: 132.75 ft at 5:30PM May 13, 2022Observed: 132.74 ft at 5:45PM May 13, 2022Observed: 132.74 ft at 6:00PM May 13, 2022Observed: 132.74 ft at 6:15PM May 13, 2022Observed: 132.73 ft at 6:30PM May 13, 2022Observed: 132.73 ft at 6:45PM May 13, 2022Observed: 132.73 ft at 7:00PM May 13, 2022Observed: 132.72 ft at 7:15PM May 13, 2022Observed: 132.72 ft at 7:30PM May 13, 2022Observed: 132.72 ft at 7:45PM May 13, 2022Observed: 132.72 ft at 8:00PM May 13, 2022Observed: 132.72 ft at 8:15PM May 13, 2022Observed: 132.71 ft at 8:30PM May 13, 2022Observed: 132.71 ft at 8:45PM May 13, 2022Observed: 132.71 ft at 9:00PM May 13, 2022Observed: 132.7 ft at 9:15PM May 13, 2022Observed: 132.7 ft at 9:30PM May 13, 2022Observed: 132.7 ft at 9:45PM May 13, 2022Observed: 132.69 ft at 10:00PM May 13, 2022Observed: 132.69 ft at 10:15PM May 13, 2022Observed: 132.69 ft at 10:30PM May 13, 2022Observed: 132.68 ft at 10:45PM May 13, 2022Observed: 132.68 ft at 11:00PM May 13, 2022Observed: 132.68 ft at 11:15PM May 13, 2022Observed: 132.67 ft at 11:30PM May 13, 2022Observed: 132.67 ft at 11:45PM May 13, 2022Observed: 132.67 ft at 12:00AM May 14, 2022Observed: 132.66 ft at 12:15AM May 14, 2022Observed: 132.66 ft at 12:30AM May 14, 2022Observed: 132.66 ft at 12:45AM May 14, 2022Observed: 132.65 ft at 1:00AM May 14, 2022Observed: 132.65 ft at 1:15AM May 14, 2022Observed: 132.64 ft at 1:30AM May 14, 2022Observed: 132.64 ft at 1:45AM May 14, 2022Observed: 132.64 ft at 2:00AM May 14, 2022Observed: 132.64 ft at 2:15AM May 14, 2022Observed: 132.63 ft at 2:30AM May 14, 2022Observed: 132.63 ft at 2:45AM May 14, 2022Observed: 132.63 ft at 3:00AM May 14, 2022Observed: 132.62 ft at 3:15AM May 14, 2022Observed: 132.62 ft at 3:30AM May 14, 2022Observed: 132.62 ft at 3:45AM May 14, 2022Observed: 132.62 ft at 4:00AM May 14, 2022Observed: 132.61 ft at 4:15AM May 14, 2022Observed: 132.61 ft at 4:30AM May 14, 2022Observed: 132.61 ft at 4:45AM May 14, 2022Observed: 132.6 ft at 5:00AM May 14, 2022Observed: 132.6 ft at 5:15AM May 14, 2022Observed: 132.6 ft at 5:30AM May 14, 2022Observed: 132.6 ft at 5:45AM May 14, 2022Observed: 132.6 ft at 6:00AM May 14, 2022Observed: 132.59 ft at 6:15AM May 14, 2022Observed: 132.59 ft at 6:30AM May 14, 2022Observed: 132.59 ft at 6:45AM May 14, 2022Observed: 132.59 ft at 7:00AM May 14, 2022Observed: 132.59 ft at 7:15AM May 14, 2022Observed: 132.59 ft at 7:30AM May 14, 2022Observed: 132.58 ft at 7:45AM May 14, 2022Observed: 132.58 ft at 8:00AM May 14, 2022Observed: 132.58 ft at 8:15AM May 14, 2022Observed: 132.58 ft at 8:30AM May 14, 2022Observed: 132.57 ft at 8:45AM May 14, 2022Observed: 132.57 ft at 9:00AM May 14, 2022Observed: 132.57 ft at 9:15AM May 14, 2022Observed: 132.57 ft at 9:30AM May 14, 2022Observed: 132.56 ft at 9:45AM May 14, 2022Observed: 132.56 ft at 10:00AM May 14, 2022Observed: 132.56 ft at 10:15AM May 14, 2022Observed: 132.56 ft at 10:30AM May 14, 2022Observed: 132.56 ft at 10:45AM May 14, 2022Observed: 132.56 ft at 11:00AM May 14, 2022Observed: 132.56 ft at 11:15AM May 14, 2022Observed: 132.56 ft at 11:30AM May 14, 2022Observed: 132.55 ft at 11:45AM May 14, 2022Observed: 132.55 ft at 12:00PM May 14, 2022Observed: 132.55 ft at 12:15PM May 14, 2022Observed: 132.55 ft at 12:30PM May 14, 2022Observed: 132.55 ft at 12:45PM May 14, 2022Observed: 132.55 ft at 1:00PM May 14, 2022Observed: 132.54 ft at 1:15PM May 14, 2022Observed: 132.54 ft at 1:30PM May 14, 2022Observed: 132.54 ft at 1:45PM May 14, 2022Observed: 132.54 ft at 2:00PM May 14, 2022Observed: 132.54 ft at 2:15PM May 14, 2022Observed: 132.54 ft at 2:30PM May 14, 2022Observed: 132.54 ft at 2:45PM May 14, 2022Observed: 132.54 ft at 3:00PM May 14, 2022Observed: 132.54 ft at 3:15PM May 14, 2022Observed: 132.53 ft at 3:30PM May 14, 2022Observed: 132.53 ft at 3:45PM May 14, 2022Observed: 132.53 ft at 4:00PM May 14, 2022Observed: 132.52 ft at 4:15PM May 14, 2022Observed: 132.52 ft at 4:30PM May 14, 2022Observed: 132.52 ft at 4:45PM May 14, 2022Observed: 132.52 ft at 5:00PM May 14, 2022Observed: 132.52 ft at 5:15PM May 14, 2022Observed: 132.52 ft at 5:30PM May 14, 2022Observed: 132.52 ft at 5:45PM May 14, 2022Observed: 132.51 ft at 6:00PM May 14, 2022Observed: 132.51 ft at 6:15PM May 14, 2022Observed: 132.51 ft at 6:30PM May 14, 2022Observed: 132.51 ft at 6:45PM May 14, 2022Observed: 132.51 ft at 7:00PM May 14, 2022Observed: 132.5 ft at 7:15PM May 14, 2022Observed: 132.5 ft at 7:30PM May 14, 2022Observed: 132.5 ft at 7:45PM May 14, 2022Observed: 132.5 ft at 8:00PM May 14, 2022Observed: 132.5 ft at 8:15PM May 14, 2022Observed: 132.5 ft at 8:30PM May 14, 2022Observed: 132.5 ft at 8:45PM May 14, 2022Observed: 132.5 ft at 9:00PM May 14, 2022Observed: 132.5 ft at 9:15PM May 14, 2022Observed: 132.5 ft at 9:30PM May 14, 2022Observed: 132.5 ft at 9:45PM May 14, 2022Observed: 132.5 ft at 10:00PM May 14, 2022Observed: 132.5 ft at 10:15PM May 14, 2022Observed: 132.49 ft at 10:30PM May 14, 2022Observed: 132.49 ft at 10:45PM May 14, 2022Observed: 132.49 ft at 11:00PM May 14, 2022Observed: 132.49 ft at 11:15PM May 14, 2022Observed: 132.49 ft at 11:30PM May 14, 2022Observed: 132.49 ft at 11:45PM May 14, 2022Observed: 132.49 ft at 12:00AM May 15, 2022Observed: 132.49 ft at 12:15AM May 15, 2022Observed: 132.48 ft at 12:30AM May 15, 2022Observed: 132.48 ft at 12:45AM May 15, 2022Observed: 132.48 ft at 1:00AM May 15, 2022Observed: 132.48 ft at 1:15AM May 15, 2022Observed: 132.48 ft at 1:30AM May 15, 2022Observed: 132.48 ft at 1:45AM May 15, 2022Observed: 132.48 ft at 2:00AM May 15, 2022Observed: 132.48 ft at 2:15AM May 15, 2022Observed: 132.48 ft at 2:30AM May 15, 2022Observed: 132.48 ft at 2:45AM May 15, 2022Observed: 132.48 ft at 3:00AM May 15, 2022Observed: 132.48 ft at 3:15AM May 15, 2022Observed: 132.47 ft at 3:30AM May 15, 2022Observed: 132.47 ft at 3:45AM May 15, 2022Observed: 132.47 ft at 4:00AM May 15, 2022Observed: 132.47 ft at 4:15AM May 15, 2022Observed: 132.46 ft at 4:30AM May 15, 2022Observed: 132.46 ft at 4:45AM May 15, 2022Observed: 132.45 ft at 5:00AM May 15, 2022Observed: 132.45 ft at 5:15AM May 15, 2022Observed: 132.45 ft at 5:30AM May 15, 2022Observed: 132.44 ft at 5:45AM May 15, 2022Observed: 132.44 ft at 6:00AM May 15, 2022Observed: 132.44 ft at 6:15AM May 15, 2022Observed: 132.44 ft at 6:30AM May 15, 2022Observed: 132.44 ft at 6:45AM May 15, 2022Observed: 132.43 ft at 7:00AM May 15, 2022Observed: 132.43 ft at 7:15AM May 15, 2022Observed: 132.42 ft at 7:30AM May 15, 2022Observed: 132.42 ft at 7:45AM May 15, 2022Observed: 132.42 ft at 8:00AM May 15, 2022Observed: 132.42 ft at 8:15AM May 15, 2022Observed: 132.42 ft at 8:30AM May 15, 2022Observed: 132.42 ft at 8:45AM May 15, 2022Observed: 132.42 ft at 9:00AM May 15, 2022Observed: 132.41 ft at 9:15AM May 15, 2022Observed: 132.41 ft at 9:30AM May 15, 2022Observed: 132.41 ft at 9:45AM May 15, 2022Observed: 132.41 ft at 10:00AM May 15, 2022Observed: 132.41 ft at 10:15AM May 15, 2022Observed: 132.41 ft at 10:30AM May 15, 2022Observed: 132.41 ft at 10:45AM May 15, 2022Observed: 132.41 ft at 11:00AM May 15, 2022Observed: 132.41 ft at 11:15AM May 15, 2022Observed: 132.41 ft at 11:30AM May 15, 2022Observed: 132.41 ft at 11:45AM May 15, 2022Observed: 132.41 ft at 12:00PM May 15, 2022Observed: 132.41 ft at 12:15PM May 15, 2022Observed: 132.41 ft at 12:30PM May 15, 2022Observed: 132.41 ft at 12:45PM May 15, 2022Observed: 132.41 ft at 1:00PM May 15, 2022Observed: 132.41 ft at 1:15PM May 15, 2022Observed: 132.41 ft at 1:30PM May 15, 2022Observed: 132.41 ft at 1:45PM May 15, 2022Observed: 132.41 ft at 2:00PM May 15, 2022Observed: 132.41 ft at 2:15PM May 15, 2022Observed: 132.41 ft at 2:30PM May 15, 2022Observed: 132.41 ft at 2:45PM May 15, 2022Observed: 132.41 ft at 3:00PM May 15, 2022Observed: 132.41 ft at 3:15PM May 15, 2022Observed: 132.41 ft at 3:30PM May 15, 2022Observed: 132.41 ft at 3:45PM May 15, 2022Observed: 132.41 ft at 4:00PM May 15, 2022Observed: 132.41 ft at 4:15PM May 15, 2022Observed: 132.41 ft at 4:30PM May 15, 2022Observed: 132.41 ft at 4:45PM May 15, 2022Observed: 132.41 ft at 5:00PM May 15, 2022Observed: 132.41 ft at 5:15PM May 15, 2022Observed: 132.41 ft at 5:30PM May 15, 2022Observed: 132.41 ft at 5:45PM May 15, 2022Observed: 132.41 ft at 6:00PM May 15, 2022Observed: 132.41 ft at 6:15PM May 15, 2022Observed: 132.41 ft at 6:30PM May 15, 2022Observed: 132.42 ft at 6:45PM May 15, 2022Observed: 132.42 ft at 7:00PM May 15, 2022Observed: 132.42 ft at 7:15PM May 15, 2022Observed: 132.42 ft at 7:30PM May 15, 2022Observed: 132.43 ft at 7:45PM May 15, 2022Observed: 132.43 ft at 8:00PM May 15, 2022Observed: 132.44 ft at 8:15PM May 15, 2022Observed: 132.44 ft at 8:30PM May 15, 2022Observed: 132.44 ft at 8:45PM May 15, 2022Observed: 132.44 ft at 9:00PM May 15, 2022Observed: 132.45 ft at 9:15PM May 15, 2022Observed: 132.46 ft at 9:30PM May 15, 2022Observed: 132.46 ft at 9:45PM May 15, 2022Observed: 132.47 ft at 10:00PM May 15, 2022Observed: 132.47 ft at 10:15PM May 15, 2022Observed: 132.48 ft at 10:30PM May 15, 2022Observed: 132.48 ft at 10:45PM May 15, 2022Observed: 132.49 ft at 11:00PM May 15, 2022Observed: 132.49 ft at 11:15PM May 15, 2022Observed: 132.5 ft at 11:30PM May 15, 2022Observed: 132.51 ft at 11:45PM May 15, 2022Observed: 132.52 ft at 12:00AM May 16, 2022Observed: 132.52 ft at 12:15AM May 16, 2022Observed: 132.54 ft at 12:30AM May 16, 2022Observed: 132.54 ft at 12:45AM May 16, 2022Observed: 132.56 ft at 1:00AM May 16, 2022Observed: 132.57 ft at 1:15AM May 16, 2022Observed: 132.58 ft at 1:30AM May 16, 2022Observed: 132.59 ft at 1:45AM May 16, 2022Observed: 132.6 ft at 2:00AM May 16, 2022Forecast: 132.54 ft 5:00AM May 16, 2022Forecast: 132.63 ft 11:00AM May 16, 2022Forecast: 132.68 ft 5:00PM May 16, 2022Highest Forecast: 132.69 ft 11:00PM May 16, 2022Forecast: 132.64 ft 5:00AM May 17, 2022Forecast: 132.55 ft 11:00AM May 17, 2022Forecast: 132.42 ft 5:00PM May 17, 2022Forecast: 132.3 ft 11:00PM May 17, 2022Forecast: 132.17 ft 5:00AM May 18, 2022Forecast: 132.06 ft 11:00AM May 18, 2022Forecast: 131.95 ft 5:00PM May 18, 2022Forecast: 131.87 ft 11:00PM May 18, 2022Forecast: 131.8 ft 5:00AM May 19, 2022Forecast: 131.75 ft 11:00AM May 19, 2022Forecast: 131.69 ft 5:00PM May 19, 2022Forecast: 131.65 ft 11:00PM May 19, 2022Forecast: 131.6 ft 5:00AM May 20, 2022Forecast: 131.55 ft 11:00AM May 20, 2022Forecast: 131.5 ft 5:00PM May 20, 2022Forecast: 131.46 ft 11:00PM May 20, 2022Forecast: 131.41 ft 5:00AM May 21, 2022Forecast: 131.37 ft 11:00AM May 21, 2022Forecast: 131.34 ft 5:00PM May 21, 2022Forecast: 131.3 ft 11:00PM May 21, 2022Forecast: 131.27 ft 5:00AM May 22, 2022Forecast: 131.25 ft 11:00AM May 22, 2022Forecast: 131.22 ft 5:00PM May 22, 2022Forecast: 131.2 ft 11:00PM May 22, 2022USGS--Water Resources of the United StatesCGMW1(plotting HGIRG) Graph Created (2:35AM May 16, 2022)ObservedForecast (issued 2:40PM May 15)Latest observed value: 132.6 ft at 2:00 AM PDT 16-May-2022. Flood Stage is 141 ft
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About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Chehalis River near Grand Mound are issued routinely year-round.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - at Rochester
Flood Categories (in feet)
Major Flood Stage: 144
Moderate Flood Stage: 142.5
Flood Stage: 141
Action Stage: 138.5
Low Stage (in feet): -9999

Historic Crests
(1) 147.26 ft on 12/04/2007
(2) 145.21 ft on 01/08/2022 (P)
(3) 142.88 ft on 01/14/2021 (P)
(4) 142.68 ft on 12/22/2019 (P)
(5) 142.59 ft on 01/04/2021 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 145.21 ft on 01/08/2022 (P)
(2) 141.41 ft on 11/13/2021 (P)
(3) 142.88 ft on 01/14/2021 (P)
(4) 142.59 ft on 01/04/2021 (P)
(5) 142.41 ft on 01/08/2020 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:13
KML Image
Gauge LocationGauge Map Marker
Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
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.
About This Location Collapse

Latitude: 46.775934° N, Longitude: 123.035692° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 141 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available 141.00 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 123.65 ft 137.65 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

Additional Information Collapse
Chehalis River Basin Flood Authority's Early Warning System:http://lewiscountywa.gov/chehalis-river-basin-flood-authority
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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(206) 526-6087
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Page last modified: 2-Nov-2020 7:27 PM
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