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Weather Forecast Office Seattle, WA Northwest River Forecast Center
Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Chehalis River near Grand Mound Stage (ft)Flow (kcfs)Observed: 4.72 ft at 5:45PM May 18, 2013Observed: 4.72 ft at 6:00PM May 18, 2013Highest Observation: 4.73 ft at 6:15PM May 18, 2013Highest Observation: 4.73 ft at 6:30PM May 18, 2013Highest Observation: 4.73 ft at 6:45PM May 18, 2013Highest Observation: 4.73 ft at 7:00PM May 18, 2013Highest Observation: 4.73 ft at 7:15PM May 18, 2013Highest Observation: 4.73 ft at 7:30PM May 18, 2013Highest Observation: 4.73 ft at 7:45PM May 18, 2013Highest Observation: 4.73 ft at 8:00PM May 18, 2013Highest Observation: 4.73 ft at 8:15PM May 18, 2013Highest Observation: 4.73 ft at 8:30PM May 18, 2013Highest Observation: 4.73 ft at 8:45PM May 18, 2013Highest Observation: 4.73 ft at 9:00PM May 18, 2013Highest Observation: 4.73 ft at 9:15PM May 18, 2013Highest Observation: 4.73 ft at 9:30PM May 18, 2013Highest Observation: 4.73 ft at 9:45PM May 18, 2013Highest Observation: 4.73 ft at 10:00PM May 18, 2013Highest Observation: 4.73 ft at 10:15PM May 18, 2013Highest Observation: 4.73 ft at 10:30PM May 18, 2013Highest Observation: 4.73 ft at 10:45PM May 18, 2013Highest Observation: 4.73 ft at 11:00PM May 18, 2013Highest Observation: 4.73 ft at 11:15PM May 18, 2013Highest Observation: 4.73 ft at 11:30PM May 18, 2013Highest Observation: 4.73 ft at 11:45PM May 18, 2013Highest Observation: 4.73 ft at 12:00AM May 19, 2013Highest Observation: 4.73 ft at 12:15AM May 19, 2013Highest Observation: 4.73 ft at 12:30AM May 19, 2013Highest Observation: 4.73 ft at 12:45AM May 19, 2013Highest Observation: 4.73 ft at 1:00AM May 19, 2013Highest Observation: 4.73 ft at 1:15AM May 19, 2013Highest Observation: 4.73 ft at 1:30AM May 19, 2013Highest Observation: 4.73 ft at 1:45AM May 19, 2013Highest Observation: 4.73 ft at 2:00AM May 19, 2013Highest Observation: 4.73 ft at 2:15AM May 19, 2013Highest Observation: 4.73 ft at 2:30AM May 19, 2013Highest Observation: 4.73 ft at 2:45AM May 19, 2013Highest Observation: 4.73 ft at 3:00AM May 19, 2013Observed: 4.72 ft at 3:15AM May 19, 2013Observed: 4.72 ft at 3:30AM May 19, 2013Observed: 4.72 ft at 3:45AM May 19, 2013Observed: 4.72 ft at 4:00AM May 19, 2013Observed: 4.72 ft at 4:15AM May 19, 2013Observed: 4.72 ft at 4:30AM May 19, 2013Observed: 4.72 ft at 4:45AM May 19, 2013Observed: 4.72 ft at 5:00AM May 19, 2013Observed: 4.72 ft at 5:15AM May 19, 2013Observed: 4.72 ft at 5:30AM May 19, 2013Observed: 4.72 ft at 5:45AM May 19, 2013Observed: 4.72 ft at 6:00AM May 19, 2013Observed: 4.72 ft at 6:15AM May 19, 2013Observed: 4.72 ft at 6:30AM May 19, 2013Observed: 4.72 ft at 6:45AM May 19, 2013Observed: 4.72 ft at 7:00AM May 19, 2013Observed: 4.72 ft at 7:15AM May 19, 2013Observed: 4.71 ft at 7:30AM May 19, 2013Observed: 4.71 ft at 7:45AM May 19, 2013Observed: 4.71 ft at 8:00AM May 19, 2013Observed: 4.71 ft at 8:15AM May 19, 2013Observed: 4.71 ft at 8:30AM May 19, 2013Observed: 4.71 ft at 8:45AM May 19, 2013Observed: 4.71 ft at 9:00AM May 19, 2013Observed: 4.71 ft at 9:15AM May 19, 2013Observed: 4.71 ft at 9:30AM May 19, 2013Observed: 4.71 ft at 9:45AM May 19, 2013Observed: 4.71 ft at 10:00AM May 19, 2013Observed: 4.7 ft at 10:15AM May 19, 2013Observed: 4.7 ft at 10:30AM May 19, 2013Observed: 4.7 ft at 10:45AM May 19, 2013Observed: 4.7 ft at 11:00AM May 19, 2013Observed: 4.7 ft at 11:15AM May 19, 2013Observed: 4.7 ft at 11:30AM May 19, 2013Observed: 4.7 ft at 11:45AM May 19, 2013Observed: 4.7 ft at 12:00PM May 19, 2013Observed: 4.7 ft at 12:15PM May 19, 2013Observed: 4.7 ft at 12:30PM May 19, 2013Observed: 4.7 ft at 12:45PM May 19, 2013Observed: 4.7 ft at 1:00PM May 19, 2013Observed: 4.7 ft at 1:15PM May 19, 2013Observed: 4.7 ft at 1:30PM May 19, 2013Observed: 4.7 ft at 1:45PM May 19, 2013Observed: 4.7 ft at 2:00PM May 19, 2013Observed: 4.69 ft at 2:15PM May 19, 2013Observed: 4.69 ft at 2:30PM May 19, 2013Observed: 4.69 ft at 2:45PM May 19, 2013Observed: 4.69 ft at 3:00PM May 19, 2013Observed: 4.69 ft at 3:15PM May 19, 2013Observed: 4.69 ft at 3:30PM May 19, 2013Observed: 4.69 ft at 3:45PM May 19, 2013Observed: 4.69 ft at 4:00PM May 19, 2013Observed: 4.69 ft at 4:15PM May 19, 2013Observed: 4.69 ft at 4:30PM May 19, 2013Observed: 4.69 ft at 4:45PM May 19, 2013Observed: 4.68 ft at 5:00PM May 19, 2013Observed: 4.68 ft at 5:15PM May 19, 2013Observed: 4.68 ft at 5:30PM May 19, 2013Observed: 4.68 ft at 5:45PM May 19, 2013Observed: 4.68 ft at 6:00PM May 19, 2013Observed: 4.68 ft at 6:15PM May 19, 2013Observed: 4.68 ft at 6:30PM May 19, 2013Observed: 4.68 ft at 6:45PM May 19, 2013Observed: 4.68 ft at 7:00PM May 19, 2013Observed: 4.68 ft at 7:15PM May 19, 2013Observed: 4.68 ft at 7:30PM May 19, 2013Observed: 4.68 ft at 7:45PM May 19, 2013Observed: 4.68 ft at 8:00PM May 19, 2013Observed: 4.68 ft at 8:15PM May 19, 2013Observed: 4.68 ft at 8:30PM May 19, 2013Observed: 4.68 ft at 8:45PM May 19, 2013Observed: 4.68 ft at 9:00PM May 19, 2013Observed: 4.68 ft at 9:15PM May 19, 2013Observed: 4.68 ft at 9:30PM May 19, 2013Observed: 4.68 ft at 9:45PM May 19, 2013Observed: 4.68 ft at 10:00PM May 19, 2013Observed: 4.68 ft at 10:15PM May 19, 2013Observed: 4.68 ft at 10:30PM May 19, 2013Observed: 4.68 ft at 10:45PM May 19, 2013Observed: 4.68 ft at 11:00PM May 19, 2013Observed: 4.68 ft at 11:15PM May 19, 2013Observed: 4.68 ft at 11:30PM May 19, 2013Observed: 4.68 ft at 11:45PM May 19, 2013Observed: 4.68 ft at 12:00AM May 20, 2013Observed: 4.68 ft at 12:15AM May 20, 2013Observed: 4.68 ft at 12:30AM May 20, 2013Observed: 4.68 ft at 12:45AM May 20, 2013Observed: 4.68 ft at 1:00AM May 20, 2013Observed: 4.68 ft at 1:15AM May 20, 2013Observed: 4.68 ft at 1:30AM May 20, 2013Observed: 4.68 ft at 1:45AM May 20, 2013Observed: 4.67 ft at 2:00AM May 20, 2013Observed: 4.67 ft at 2:15AM May 20, 2013Observed: 4.67 ft at 2:30AM May 20, 2013Observed: 4.67 ft at 2:45AM May 20, 2013Observed: 4.67 ft at 3:00AM May 20, 2013Observed: 4.67 ft at 3:15AM May 20, 2013Observed: 4.67 ft at 3:30AM May 20, 2013Observed: 4.67 ft at 3:45AM May 20, 2013Observed: 4.67 ft at 4:00AM May 20, 2013Observed: 4.67 ft at 4:15AM May 20, 2013Observed: 4.67 ft at 4:30AM May 20, 2013Observed: 4.67 ft at 4:45AM May 20, 2013Observed: 4.66 ft at 5:00AM May 20, 2013Observed: 4.66 ft at 5:15AM May 20, 2013Observed: 4.66 ft at 5:30AM May 20, 2013Observed: 4.66 ft at 5:45AM May 20, 2013Observed: 4.66 ft at 6:00AM May 20, 2013Observed: 4.66 ft at 6:15AM May 20, 2013Observed: 4.66 ft at 6:30AM May 20, 2013Observed: 4.66 ft at 6:45AM May 20, 2013Observed: 4.66 ft at 7:00AM May 20, 2013Observed: 4.66 ft at 7:15AM May 20, 2013Observed: 4.66 ft at 7:30AM May 20, 2013Observed: 4.66 ft at 7:45AM May 20, 2013Observed: 4.66 ft at 8:00AM May 20, 2013Observed: 4.66 ft at 8:15AM May 20, 2013Observed: 4.66 ft at 8:30AM May 20, 2013Observed: 4.66 ft at 8:45AM May 20, 2013Observed: 4.66 ft at 9:00AM May 20, 2013Observed: 4.66 ft at 9:15AM May 20, 2013Observed: 4.66 ft at 9:30AM May 20, 2013Observed: 4.66 ft at 9:45AM May 20, 2013Observed: 4.66 ft at 10:00AM May 20, 2013Observed: 4.65 ft at 10:15AM May 20, 2013Observed: 4.65 ft at 10:30AM May 20, 2013Observed: 4.65 ft at 10:45AM May 20, 2013Observed: 4.65 ft at 11:00AM May 20, 2013Observed: 4.65 ft at 11:15AM May 20, 2013Observed: 4.65 ft at 11:30AM May 20, 2013Observed: 4.65 ft at 11:45AM May 20, 2013Observed: 4.65 ft at 12:00PM May 20, 2013Observed: 4.65 ft at 12:15PM May 20, 2013Observed: 4.64 ft at 12:30PM May 20, 2013Observed: 4.64 ft at 12:45PM May 20, 2013Observed: 4.64 ft at 1:00PM May 20, 2013Observed: 4.64 ft at 1:15PM May 20, 2013Observed: 4.64 ft at 1:30PM May 20, 2013Observed: 4.64 ft at 1:45PM May 20, 2013Observed: 4.64 ft at 2:00PM May 20, 2013Observed: 4.64 ft at 2:15PM May 20, 2013Observed: 4.64 ft at 2:30PM May 20, 2013Observed: 4.64 ft at 2:45PM May 20, 2013Observed: 4.64 ft at 3:00PM May 20, 2013Observed: 4.64 ft at 3:15PM May 20, 2013Observed: 4.63 ft at 3:30PM May 20, 2013Observed: 4.63 ft at 3:45PM May 20, 2013Observed: 4.63 ft at 4:00PM May 20, 2013Observed: 4.63 ft at 4:15PM May 20, 2013Observed: 4.63 ft at 4:30PM May 20, 2013Observed: 4.63 ft at 4:45PM May 20, 2013Observed: 4.63 ft at 5:00PM May 20, 2013Observed: 4.63 ft at 5:15PM May 20, 2013Observed: 4.63 ft at 5:30PM May 20, 2013Observed: 4.63 ft at 5:45PM May 20, 2013Observed: 4.63 ft at 6:00PM May 20, 2013Observed: 4.62 ft at 6:15PM May 20, 2013Observed: 4.62 ft at 6:30PM May 20, 2013Observed: 4.62 ft at 6:45PM May 20, 2013Observed: 4.62 ft at 7:00PM May 20, 2013Observed: 4.62 ft at 7:15PM May 20, 2013Observed: 4.62 ft at 7:30PM May 20, 2013Observed: 4.62 ft at 7:45PM May 20, 2013Observed: 4.62 ft at 8:00PM May 20, 2013Observed: 4.62 ft at 9:15PM May 20, 2013Observed: 4.62 ft at 9:30PM May 20, 2013Observed: 4.62 ft at 9:45PM May 20, 2013Observed: 4.62 ft at 10:00PM May 20, 2013Observed: 4.62 ft at 10:15PM May 20, 2013Observed: 4.62 ft at 10:30PM May 20, 2013Observed: 4.62 ft at 10:45PM May 20, 2013Observed: 4.61 ft at 11:00PM May 20, 2013Observed: 4.61 ft at 11:15PM May 20, 2013Observed: 4.61 ft at 11:30PM May 20, 2013Observed: 4.61 ft at 11:45PM May 20, 2013Observed: 4.61 ft at 12:00AM May 21, 2013Observed: 4.61 ft at 12:15AM May 21, 2013Observed: 4.61 ft at 12:30AM May 21, 2013Observed: 4.61 ft at 12:45AM May 21, 2013Observed: 4.61 ft at 1:00AM May 21, 2013Observed: 4.61 ft at 1:15AM May 21, 2013Observed: 4.61 ft at 1:30AM May 21, 2013Observed: 4.61 ft at 1:45AM May 21, 2013Observed: 4.61 ft at 2:00AM May 21, 2013Observed: 4.61 ft at 2:15AM May 21, 2013Observed: 4.62 ft at 2:30AM May 21, 2013Observed: 4.62 ft at 2:45AM May 21, 2013Observed: 4.62 ft at 3:00AM May 21, 2013Observed: 4.62 ft at 3:15AM May 21, 2013Observed: 4.62 ft at 3:30AM May 21, 2013Observed: 4.62 ft at 3:45AM May 21, 2013Observed: 4.62 ft at 4:00AM May 21, 2013Observed: 4.62 ft at 4:15AM May 21, 2013Observed: 4.62 ft at 4:30AM May 21, 2013Observed: 4.62 ft at 4:45AM May 21, 2013Observed: 4.62 ft at 5:00AM May 21, 2013Observed: 4.62 ft at 5:15AM May 21, 2013Observed: 4.62 ft at 5:30AM May 21, 2013Observed: 4.62 ft at 5:45AM May 21, 2013Observed: 4.62 ft at 6:00AM May 21, 2013Observed: 4.62 ft at 6:15AM May 21, 2013Observed: 4.62 ft at 6:30AM May 21, 2013Observed: 4.62 ft at 6:45AM May 21, 2013Observed: 4.62 ft at 7:00AM May 21, 2013Observed: 4.62 ft at 7:15AM May 21, 2013Observed: 4.62 ft at 7:30AM May 21, 2013Observed: 4.62 ft at 7:45AM May 21, 2013Observed: 4.62 ft at 8:00AM May 21, 2013Observed: 4.62 ft at 8:15AM May 21, 2013Observed: 4.62 ft at 8:30AM May 21, 2013Observed: 4.63 ft at 8:45AM May 21, 2013Observed: 4.63 ft at 9:00AM May 21, 2013Observed: 4.63 ft at 9:15AM May 21, 2013Observed: 4.63 ft at 9:30AM May 21, 2013Observed: 4.63 ft at 9:45AM May 21, 2013Observed: 4.63 ft at 10:00AM May 21, 2013Observed: 4.63 ft at 10:15AM May 21, 2013Observed: 4.63 ft at 10:30AM May 21, 2013Observed: 4.63 ft at 10:45AM May 21, 2013Observed: 4.64 ft at 11:00AM May 21, 2013Observed: 4.64 ft at 11:15AM May 21, 2013Observed: 4.64 ft at 11:30AM May 21, 2013Observed: 4.64 ft at 11:45AM May 21, 2013Observed: 4.64 ft at 12:00PM May 21, 2013Observed: 4.64 ft at 12:15PM May 21, 2013Observed: 4.64 ft at 12:30PM May 21, 2013Observed: 4.64 ft at 12:45PM May 21, 2013Observed: 4.64 ft at 1:00PM May 21, 2013Observed: 4.64 ft at 1:15PM May 21, 2013Observed: 4.64 ft at 1:30PM May 21, 2013Observed: 4.64 ft at 1:45PM May 21, 2013Observed: 4.65 ft at 2:00PM May 21, 2013Observed: 4.65 ft at 2:15PM May 21, 2013Observed: 4.65 ft at 2:30PM May 21, 2013Observed: 4.65 ft at 2:45PM May 21, 2013Observed: 4.65 ft at 3:00PM May 21, 2013Observed: 4.66 ft at 3:15PM May 21, 2013Observed: 4.66 ft at 3:30PM May 21, 2013Observed: 4.66 ft at 3:45PM May 21, 2013Observed: 4.66 ft at 4:00PM May 21, 2013Observed: 4.66 ft at 4:15PM May 21, 2013Observed: 4.66 ft at 4:30PM May 21, 2013Observed: 4.66 ft at 4:45PM May 21, 2013Observed: 4.66 ft at 5:00PM May 21, 2013Forecast: 4.64 ft 11:00PM May 21, 2013Forecast: 4.66 ft 5:00AM May 22, 2013Forecast: 4.68 ft 11:00AM May 22, 2013Forecast: 4.71 ft 5:00PM May 22, 2013Forecast: 4.73 ft 11:00PM May 22, 2013Forecast: 4.75 ft 5:00AM May 23, 2013Forecast: 4.77 ft 11:00AM May 23, 2013Forecast: 4.8 ft 5:00PM May 23, 2013Highest Forecast: 4.81 ft 11:00PM May 23, 2013Forecast: 4.8 ft 5:00AM May 24, 2013Forecast: 4.76 ft 11:00AM May 24, 2013Forecast: 4.73 ft 5:00PM May 24, 2013Forecast: 4.69 ft 11:00PM May 24, 2013Forecast: 4.65 ft 5:00AM May 25, 2013Forecast: 4.62 ft 11:00AM May 25, 2013Forecast: 4.58 ft 5:00PM May 25, 2013Forecast: 4.55 ft 11:00PM May 25, 2013Forecast: 4.53 ft 5:00AM May 26, 2013Forecast: 4.51 ft 11:00AM May 26, 2013Forecast: 4.48 ft 5:00PM May 26, 2013USGS--Water Resources of the United StatesCGMW1(plotting HGIRG) Graph Created (5:44PM May 21, 2013)ObservedForecast (issued 11:44AM May 21)Latest observed value: 4.66 ft at 5:00 PM PDT 21-May-2013. Flood Stage is 14 ft
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About this graph
Tabular Data
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Chehalis River near Grand Mound are issued routinely year-round.
Return to Area Map
Upstream Gauge - at Centralia Upstream Gauge Downstream Gauge Downstream Gauge - at Porter
Flood Categories (in feet)
Major Flood Stage:17
Moderate Flood Stage:15.5
Flood Stage:14
Action Stage:0

Historical Crests
(1) 20.23 ft on 12/04/2007
(2) 19.98 ft on 02/09/1996
(3) 19.34 ft on 01/10/1990
(4) 18.41 ft on 11/25/1986
(5) 18.39 ft on 12/29/1937
Show More Historical Crests

Low Water Records
Legend
Gauge Location
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
19 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.
17.5 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.
15.5 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.
14 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.
12.5 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: 46.776111° N, Longitude: 123.034444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 14 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 Not Available 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  

Other Data Sources:
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
National Weather Service
Seattle Weather Forecast Office
7600 Sandpoint Way NE
Seattle, WA 98115-6349
(206) 526-6087
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Page last modified: 13-Mar-2013 6:31 PM 		Disclaimer
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