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Hydrograph River at a Glance Download
Chehalis River at Porter Stage (ft)Flow (kcfs)Highest Observation: 9.95 ft at 12:00PM Oct 27, 2014Observed: 9.92 ft at 12:15PM Oct 27, 2014Observed: 9.93 ft at 12:30PM Oct 27, 2014Observed: 9.92 ft at 12:45PM Oct 27, 2014Observed: 9.9 ft at 1:00PM Oct 27, 2014Observed: 9.91 ft at 1:15PM Oct 27, 2014Observed: 9.9 ft at 1:30PM Oct 27, 2014Observed: 9.86 ft at 1:45PM Oct 27, 2014Observed: 9.88 ft at 2:00PM Oct 27, 2014Observed: 9.84 ft at 2:15PM Oct 27, 2014Observed: 9.83 ft at 2:30PM Oct 27, 2014Observed: 9.81 ft at 2:45PM Oct 27, 2014Observed: 9.83 ft at 3:00PM Oct 27, 2014Observed: 9.8 ft at 3:15PM Oct 27, 2014Observed: 9.78 ft at 3:30PM Oct 27, 2014Observed: 9.79 ft at 3:45PM Oct 27, 2014Observed: 9.8 ft at 4:00PM Oct 27, 2014Observed: 9.79 ft at 4:15PM Oct 27, 2014Observed: 9.77 ft at 4:30PM Oct 27, 2014Observed: 9.75 ft at 4:45PM Oct 27, 2014Observed: 9.73 ft at 5:00PM Oct 27, 2014Observed: 9.7 ft at 5:15PM Oct 27, 2014Observed: 9.72 ft at 5:30PM Oct 27, 2014Observed: 9.69 ft at 5:45PM Oct 27, 2014Observed: 9.69 ft at 6:00PM Oct 27, 2014Observed: 9.68 ft at 6:15PM Oct 27, 2014Observed: 9.64 ft at 6:30PM Oct 27, 2014Observed: 9.67 ft at 6:45PM Oct 27, 2014Observed: 9.63 ft at 7:00PM Oct 27, 2014Observed: 9.61 ft at 7:15PM Oct 27, 2014Observed: 9.6 ft at 7:30PM Oct 27, 2014Observed: 9.57 ft at 7:45PM Oct 27, 2014Observed: 9.59 ft at 8:00PM Oct 27, 2014Observed: 9.57 ft at 8:15PM Oct 27, 2014Observed: 9.56 ft at 8:30PM Oct 27, 2014Observed: 9.52 ft at 8:45PM Oct 27, 2014Observed: 9.53 ft at 9:00PM Oct 27, 2014Observed: 9.51 ft at 9:15PM Oct 27, 2014Observed: 9.49 ft at 9:30PM Oct 27, 2014Observed: 9.48 ft at 9:45PM Oct 27, 2014Observed: 9.47 ft at 10:00PM Oct 27, 2014Observed: 9.44 ft at 10:15PM Oct 27, 2014Observed: 9.41 ft at 10:30PM Oct 27, 2014Observed: 9.43 ft at 10:45PM Oct 27, 2014Observed: 9.41 ft at 11:00PM Oct 27, 2014Observed: 9.38 ft at 11:15PM Oct 27, 2014Observed: 9.38 ft at 11:30PM Oct 27, 2014Observed: 9.36 ft at 11:45PM Oct 27, 2014Observed: 9.34 ft at 12:00AM Oct 28, 2014Observed: 9.34 ft at 12:15AM Oct 28, 2014Observed: 9.31 ft at 12:30AM Oct 28, 2014Observed: 9.28 ft at 12:45AM Oct 28, 2014Observed: 9.29 ft at 1:00AM Oct 28, 2014Observed: 9.28 ft at 1:15AM Oct 28, 2014Observed: 9.26 ft at 1:30AM Oct 28, 2014Observed: 9.26 ft at 1:45AM Oct 28, 2014Observed: 9.21 ft at 2:00AM Oct 28, 2014Observed: 9.23 ft at 2:15AM Oct 28, 2014Observed: 9.2 ft at 2:30AM Oct 28, 2014Observed: 9.2 ft at 2:45AM Oct 28, 2014Observed: 9.18 ft at 3:00AM Oct 28, 2014Observed: 9.16 ft at 3:15AM Oct 28, 2014Observed: 9.17 ft at 3:30AM Oct 28, 2014Observed: 9.13 ft at 3:45AM Oct 28, 2014Observed: 9.13 ft at 4:00AM Oct 28, 2014Observed: 9.1 ft at 4:15AM Oct 28, 2014Observed: 9.1 ft at 4:30AM Oct 28, 2014Observed: 9.08 ft at 4:45AM Oct 28, 2014Observed: 9.09 ft at 5:00AM Oct 28, 2014Observed: 9.06 ft at 5:15AM Oct 28, 2014Observed: 9.03 ft at 5:30AM Oct 28, 2014Observed: 9.04 ft at 5:45AM Oct 28, 2014Observed: 9.04 ft at 6:00AM Oct 28, 2014Observed: 9.02 ft at 6:15AM Oct 28, 2014Observed: 9.01 ft at 6:30AM Oct 28, 2014Observed: 8.97 ft at 6:45AM Oct 28, 2014Observed: 8.98 ft at 7:00AM Oct 28, 2014Observed: 8.98 ft at 7:15AM Oct 28, 2014Observed: 8.99 ft at 7:30AM Oct 28, 2014Observed: 8.96 ft at 7:45AM Oct 28, 2014Observed: 8.95 ft at 8:00AM Oct 28, 2014Observed: 8.97 ft at 8:15AM Oct 28, 2014Observed: 8.94 ft at 8:30AM Oct 28, 2014Observed: 8.94 ft at 8:45AM Oct 28, 2014Observed: 8.94 ft at 9:00AM Oct 28, 2014Observed: 8.91 ft at 9:15AM Oct 28, 2014Observed: 8.92 ft at 9:30AM Oct 28, 2014Observed: 8.9 ft at 9:45AM Oct 28, 2014Observed: 8.89 ft at 10:00AM Oct 28, 2014Observed: 8.89 ft at 10:15AM Oct 28, 2014Observed: 8.88 ft at 10:30AM Oct 28, 2014Observed: 8.86 ft at 10:45AM Oct 28, 2014Observed: 8.88 ft at 11:00AM Oct 28, 2014Observed: 8.88 ft at 11:15AM Oct 28, 2014Observed: 8.87 ft at 11:30AM Oct 28, 2014Observed: 8.85 ft at 11:45AM Oct 28, 2014Observed: 8.85 ft at 12:00PM Oct 28, 2014Observed: 8.86 ft at 12:15PM Oct 28, 2014Observed: 8.85 ft at 12:30PM Oct 28, 2014Observed: 8.85 ft at 12:45PM Oct 28, 2014Observed: 8.83 ft at 1:00PM Oct 28, 2014Observed: 8.83 ft at 1:15PM Oct 28, 2014Observed: 8.81 ft at 1:30PM Oct 28, 2014Observed: 8.83 ft at 1:45PM Oct 28, 2014Observed: 8.82 ft at 2:00PM Oct 28, 2014Observed: 8.83 ft at 2:15PM Oct 28, 2014Observed: 8.82 ft at 2:30PM Oct 28, 2014Observed: 8.81 ft at 2:45PM Oct 28, 2014Observed: 8.81 ft at 3:00PM Oct 28, 2014Observed: 8.8 ft at 3:15PM Oct 28, 2014Observed: 8.78 ft at 3:30PM Oct 28, 2014Observed: 8.76 ft at 3:45PM Oct 28, 2014Observed: 8.76 ft at 4:00PM Oct 28, 2014Observed: 8.76 ft at 4:15PM Oct 28, 2014Observed: 8.75 ft at 4:30PM Oct 28, 2014Observed: 8.73 ft at 4:45PM Oct 28, 2014Observed: 8.73 ft at 5:00PM Oct 28, 2014Observed: 8.73 ft at 5:15PM Oct 28, 2014Observed: 8.71 ft at 5:30PM Oct 28, 2014Observed: 8.7 ft at 5:45PM Oct 28, 2014Observed: 8.71 ft at 6:00PM Oct 28, 2014Observed: 8.69 ft at 6:15PM Oct 28, 2014Observed: 8.69 ft at 6:30PM Oct 28, 2014Observed: 8.67 ft at 6:45PM Oct 28, 2014Observed: 8.66 ft at 7:00PM Oct 28, 2014Observed: 8.66 ft at 7:15PM Oct 28, 2014Observed: 8.63 ft at 7:30PM Oct 28, 2014Observed: 8.63 ft at 7:45PM Oct 28, 2014Observed: 8.6 ft at 8:00PM Oct 28, 2014Observed: 8.6 ft at 8:15PM Oct 28, 2014Observed: 8.6 ft at 8:30PM Oct 28, 2014Observed: 8.6 ft at 8:45PM Oct 28, 2014Observed: 8.56 ft at 9:00PM Oct 28, 2014Observed: 8.56 ft at 9:15PM Oct 28, 2014Observed: 8.56 ft at 9:30PM Oct 28, 2014Observed: 8.55 ft at 9:45PM Oct 28, 2014Observed: 8.53 ft at 10:00PM Oct 28, 2014Observed: 8.53 ft at 10:15PM Oct 28, 2014Observed: 8.52 ft at 10:30PM Oct 28, 2014Observed: 8.52 ft at 10:45PM Oct 28, 2014Observed: 8.49 ft at 11:00PM Oct 28, 2014Observed: 8.49 ft at 11:15PM Oct 28, 2014Observed: 8.5 ft at 11:30PM Oct 28, 2014Observed: 8.48 ft at 11:45PM Oct 28, 2014Observed: 8.48 ft at 12:00AM Oct 29, 2014Observed: 8.46 ft at 12:15AM Oct 29, 2014Observed: 8.46 ft at 12:30AM Oct 29, 2014Observed: 8.46 ft at 12:45AM Oct 29, 2014Observed: 8.44 ft at 1:00AM Oct 29, 2014Observed: 8.44 ft at 1:15AM Oct 29, 2014Observed: 8.42 ft at 1:30AM Oct 29, 2014Observed: 8.43 ft at 1:45AM Oct 29, 2014Observed: 8.42 ft at 2:00AM Oct 29, 2014Observed: 8.42 ft at 2:15AM Oct 29, 2014Observed: 8.41 ft at 2:30AM Oct 29, 2014Observed: 8.41 ft at 2:45AM Oct 29, 2014Observed: 8.4 ft at 3:00AM Oct 29, 2014Observed: 8.4 ft at 3:15AM Oct 29, 2014Observed: 8.4 ft at 3:30AM Oct 29, 2014Observed: 8.4 ft at 3:45AM Oct 29, 2014Observed: 8.39 ft at 4:00AM Oct 29, 2014Observed: 8.38 ft at 4:15AM Oct 29, 2014Observed: 8.39 ft at 4:30AM Oct 29, 2014Observed: 8.38 ft at 4:45AM Oct 29, 2014Observed: 8.39 ft at 5:00AM Oct 29, 2014Observed: 8.38 ft at 5:15AM Oct 29, 2014Observed: 8.38 ft at 5:30AM Oct 29, 2014Observed: 8.39 ft at 5:45AM Oct 29, 2014Observed: 8.4 ft at 6:00AM Oct 29, 2014Observed: 8.4 ft at 6:15AM Oct 29, 2014Observed: 8.4 ft at 6:30AM Oct 29, 2014Observed: 8.39 ft at 6:45AM Oct 29, 2014Observed: 8.4 ft at 7:00AM Oct 29, 2014Observed: 8.41 ft at 7:15AM Oct 29, 2014Observed: 8.4 ft at 7:30AM Oct 29, 2014Observed: 8.4 ft at 7:45AM Oct 29, 2014Observed: 8.41 ft at 8:00AM Oct 29, 2014Observed: 8.42 ft at 8:15AM Oct 29, 2014Observed: 8.44 ft at 8:30AM Oct 29, 2014Observed: 8.43 ft at 8:45AM Oct 29, 2014Observed: 8.41 ft at 9:00AM Oct 29, 2014Observed: 8.43 ft at 9:15AM Oct 29, 2014Observed: 8.45 ft at 9:30AM Oct 29, 2014Observed: 8.45 ft at 9:45AM Oct 29, 2014Observed: 8.46 ft at 10:00AM Oct 29, 2014Observed: 8.46 ft at 10:15AM Oct 29, 2014Observed: 8.47 ft at 10:30AM Oct 29, 2014Observed: 8.48 ft at 10:45AM Oct 29, 2014Observed: 8.49 ft at 11:00AM Oct 29, 2014Observed: 8.5 ft at 11:15AM Oct 29, 2014Observed: 8.5 ft at 11:30AM Oct 29, 2014Observed: 8.51 ft at 11:45AM Oct 29, 2014Observed: 8.51 ft at 12:00PM Oct 29, 2014Observed: 8.52 ft at 12:15PM Oct 29, 2014Observed: 8.53 ft at 12:30PM Oct 29, 2014Observed: 8.55 ft at 12:45PM Oct 29, 2014Observed: 8.55 ft at 1:00PM Oct 29, 2014Observed: 8.55 ft at 1:15PM Oct 29, 2014Observed: 8.57 ft at 1:30PM Oct 29, 2014Observed: 8.56 ft at 1:45PM Oct 29, 2014Observed: 8.58 ft at 2:00PM Oct 29, 2014Observed: 8.58 ft at 2:15PM Oct 29, 2014Observed: 8.58 ft at 2:30PM Oct 29, 2014Observed: 8.59 ft at 2:45PM Oct 29, 2014Observed: 8.6 ft at 3:00PM Oct 29, 2014Observed: 8.59 ft at 3:15PM Oct 29, 2014Observed: 8.61 ft at 3:30PM Oct 29, 2014Observed: 8.6 ft at 3:45PM Oct 29, 2014Observed: 8.61 ft at 4:00PM Oct 29, 2014Observed: 8.62 ft at 4:15PM Oct 29, 2014Observed: 8.62 ft at 4:30PM Oct 29, 2014Observed: 8.62 ft at 4:45PM Oct 29, 2014Observed: 8.62 ft at 5:00PM Oct 29, 2014Observed: 8.62 ft at 5:15PM Oct 29, 2014Observed: 8.63 ft at 5:30PM Oct 29, 2014Observed: 8.62 ft at 5:45PM Oct 29, 2014Observed: 8.63 ft at 6:00PM Oct 29, 2014Observed: 8.64 ft at 6:15PM Oct 29, 2014Observed: 8.64 ft at 6:30PM Oct 29, 2014Observed: 8.64 ft at 6:45PM Oct 29, 2014Observed: 8.66 ft at 7:00PM Oct 29, 2014Observed: 8.66 ft at 7:15PM Oct 29, 2014Observed: 8.67 ft at 7:30PM Oct 29, 2014Observed: 8.65 ft at 7:45PM Oct 29, 2014Observed: 8.68 ft at 8:00PM Oct 29, 2014Observed: 8.67 ft at 8:15PM Oct 29, 2014Observed: 8.67 ft at 8:30PM Oct 29, 2014Observed: 8.67 ft at 8:45PM Oct 29, 2014Observed: 8.7 ft at 9:00PM Oct 29, 2014Observed: 8.7 ft at 9:15PM Oct 29, 2014Observed: 8.71 ft at 9:30PM Oct 29, 2014Observed: 8.72 ft at 9:45PM Oct 29, 2014Observed: 8.74 ft at 10:00PM Oct 29, 2014Observed: 8.75 ft at 10:15PM Oct 29, 2014Observed: 8.76 ft at 10:30PM Oct 29, 2014Observed: 8.76 ft at 10:45PM Oct 29, 2014Observed: 8.79 ft at 11:00PM Oct 29, 2014Observed: 8.78 ft at 11:15PM Oct 29, 2014Observed: 8.79 ft at 11:30PM Oct 29, 2014Observed: 8.81 ft at 11:45PM Oct 29, 2014Observed: 8.83 ft at 12:00AM Oct 30, 2014Observed: 8.85 ft at 12:15AM Oct 30, 2014Observed: 8.88 ft at 12:30AM Oct 30, 2014Observed: 8.88 ft at 12:45AM Oct 30, 2014Observed: 8.87 ft at 1:00AM Oct 30, 2014Observed: 8.91 ft at 1:15AM Oct 30, 2014Observed: 8.94 ft at 1:30AM Oct 30, 2014Observed: 8.96 ft at 1:45AM Oct 30, 2014Observed: 8.96 ft at 2:00AM Oct 30, 2014Observed: 8.98 ft at 2:15AM Oct 30, 2014Observed: 9 ft at 2:30AM Oct 30, 2014Observed: 9.01 ft at 2:45AM Oct 30, 2014Observed: 9.05 ft at 3:00AM Oct 30, 2014Observed: 9.04 ft at 3:15AM Oct 30, 2014Observed: 9.07 ft at 3:30AM Oct 30, 2014Observed: 9.1 ft at 3:45AM Oct 30, 2014Observed: 9.1 ft at 4:00AM Oct 30, 2014Observed: 9.14 ft at 4:15AM Oct 30, 2014Observed: 9.14 ft at 4:30AM Oct 30, 2014Observed: 9.18 ft at 4:45AM Oct 30, 2014Observed: 9.18 ft at 5:00AM Oct 30, 2014Observed: 9.23 ft at 5:15AM Oct 30, 2014Observed: 9.24 ft at 5:30AM Oct 30, 2014Observed: 9.27 ft at 5:45AM Oct 30, 2014Observed: 9.29 ft at 6:00AM Oct 30, 2014Observed: 9.29 ft at 6:15AM Oct 30, 2014Observed: 9.3 ft at 6:30AM Oct 30, 2014Observed: 9.31 ft at 6:45AM Oct 30, 2014Observed: 9.34 ft at 7:00AM Oct 30, 2014Observed: 9.37 ft at 7:15AM Oct 30, 2014Observed: 9.38 ft at 7:30AM Oct 30, 2014Observed: 9.39 ft at 7:45AM Oct 30, 2014Observed: 9.41 ft at 8:00AM Oct 30, 2014Observed: 9.44 ft at 8:15AM Oct 30, 2014Observed: 9.45 ft at 8:30AM Oct 30, 2014Observed: 9.49 ft at 8:45AM Oct 30, 2014Observed: 9.47 ft at 9:00AM Oct 30, 2014Observed: 9.49 ft at 9:15AM Oct 30, 2014Observed: 9.51 ft at 9:30AM Oct 30, 2014Observed: 9.53 ft at 9:45AM Oct 30, 2014Observed: 9.53 ft at 10:00AM Oct 30, 2014Observed: 9.54 ft at 10:15AM Oct 30, 2014Observed: 9.56 ft at 10:30AM Oct 30, 2014Observed: 9.54 ft at 10:45AM Oct 30, 2014Forecast: 9.77 ft 5:00PM Oct 30, 2014Forecast: 9.89 ft 11:00PM Oct 30, 2014Forecast: 10.13 ft 5:00AM Oct 31, 2014Forecast: 10.53 ft 11:00AM Oct 31, 2014Forecast: 10.98 ft 5:00PM Oct 31, 2014Forecast: 11.38 ft 11:00PM Oct 31, 2014Forecast: 11.68 ft 5:00AM Nov 01, 2014Forecast: 11.88 ft 11:00AM Nov 01, 2014Forecast: 12.01 ft 5:00PM Nov 01, 2014Forecast: 12.1 ft 11:00PM Nov 01, 2014Highest Forecast: 12.15 ft 4:00AM Nov 02, 2014Forecast: 12.08 ft 10:00AM Nov 02, 2014USGS--Water Resources of the United StatesCRPW1(plotting HGIRG) Graph Created (11:47AM Oct 30, 2014)ObservedForecast (issued 9:26AM Oct 30)Latest observed value: 9.54 ft at 10:45 AM PDT 30-Oct-2014. Flood Stage is 21 ft
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About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Chehalis River at Porter are issued routinely year-round.
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Upstream Gauge - near Grand Mound Upstream Gauge
Flood Categories (in feet)
Major Flood Stage:25
Moderate Flood Stage:23
Flood Stage:21
Action Stage:0

Historical Crests
(1) 26.06 ft on 12/05/2007
(2) 25.22 ft on 02/09/1996
(3) 24.65 ft on 01/09/2009
(4) 24.52 ft on 01/11/1990
(5) 23.88 ft on 01/22/1972
Show More Historical Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.20 ft on 10/17/1952
Zoom Level:16
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
25 the Chehalis River in Grays Harbor will cause major near record flooding from Oakville downstream to Grays Harbor. Deep and swift flood waters will inundate numerous farms and roads...including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Chehalis River Basin.
23 feet...the Chehalis River in Grays Harbor will flood numerous farms and roads including SR 12. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
22 the Chehalis River in Grays Harbor will flood pasture lands and many roads...including SR 12 between Oakville and Rochester. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
21 the Chehalis River in Grays Harbor will flood low pasture lands and some roads. High tidal levels at Aberdeen will worsen flooding along the lower reaches.
19 the Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.
About This Location Collapse

Latitude: 46.939444° N, Longitude: 123.313056° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 21 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 23.64 ft 44.64 ft  

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: 5-Aug-2014 6:36 PM
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