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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Chehalis River at Porter Forecast crest: 9.8 ft at 10:00am Feb 12 Observed crest: 8.77 ft at 10:00am Feb 06 Observed: 8.95 ft at 2:00pm Jan 30 Observed: 8.94 ft at 3:00pm Jan 30 Observed: 8.93 ft at 4:00pm Jan 30 Observed: 8.92 ft at 5:00pm Jan 30 Observed: 8.92 ft at 6:00pm Jan 30 Observed: 8.91 ft at 7:00pm Jan 30 Observed: 8.91 ft at 8:00pm Jan 30 Observed: 8.9 ft at 9:00pm Jan 30 Observed: 8.89 ft at 10:00pm Jan 30 Observed: 8.89 ft at 11:00pm Jan 30 Observed: 8.85 ft at 12:00am Jan 31 Observed: 8.86 ft at 1:00am Jan 31 Observed: 8.86 ft at 2:00am Jan 31 Observed: 8.87 ft at 3:00am Jan 31 Observed: 8.86 ft at 4:00am Jan 31 Observed: 8.85 ft at 5:00am Jan 31 Observed: 8.84 ft at 6:00am Jan 31 Observed: 8.85 ft at 7:00am Jan 31 Observed: 8.84 ft at 8:00am Jan 31 Observed: 8.85 ft at 9:00am Jan 31 Observed: 8.83 ft at 10:00am Jan 31 Observed: 8.82 ft at 11:00am Jan 31 Observed: 8.83 ft at 12:00pm Jan 31 Observed: 8.82 ft at 1:00pm Jan 31 Observed: 8.83 ft at 2:00pm Jan 31 Observed: 8.82 ft at 3:00pm Jan 31 Observed: 8.84 ft at 4:00pm Jan 31 Observed: 8.82 ft at 5:00pm Jan 31 Observed: 8.82 ft at 6:00pm Jan 31 Observed: 8.82 ft at 7:00pm Jan 31 Observed: 8.83 ft at 8:00pm Jan 31 Observed: 8.83 ft at 9:00pm Jan 31 Observed: 8.82 ft at 10:00pm Jan 31 Observed: 8.82 ft at 11:00pm Jan 31 Observed: 8.83 ft at 12:00am Feb 1 Observed: 8.81 ft at 1:00am Feb 1 Observed: 8.8 ft at 2:00am Feb 1 Observed: 8.81 ft at 3:00am Feb 1 Observed: 8.81 ft at 4:00am Feb 1 Observed: 8.81 ft at 5:00am Feb 1 Observed: 8.8 ft at 6:00am Feb 1 Observed: 8.78 ft at 7:00am Feb 1 Observed: 8.77 ft at 8:00am Feb 1 Observed: 8.77 ft at 9:00am Feb 1 Observed: 8.76 ft at 10:00am Feb 1 Observed: 8.74 ft at 11:00am Feb 1 Observed: 8.74 ft at 12:00pm Feb 1 Observed: 8.7 ft at 1:00pm Feb 1 Observed: 8.72 ft at 2:00pm Feb 1 Observed: 8.72 ft at 3:00pm Feb 1 Observed: 8.71 ft at 4:00pm Feb 1 Observed: 8.69 ft at 5:00pm Feb 1 Observed: 8.7 ft at 6:00pm Feb 1 Observed: 8.71 ft at 7:00pm Feb 1 Observed: 8.69 ft at 8:00pm Feb 1 Observed: 8.69 ft at 9:00pm Feb 1 Observed: 8.69 ft at 10:00pm Feb 1 Observed: 8.68 ft at 11:00pm Feb 1 Observed: 8.69 ft at 12:00am Feb 2 Observed: 8.69 ft at 1:00am Feb 2 Observed: 8.69 ft at 2:00am Feb 2 Observed: 8.68 ft at 3:00am Feb 2 Observed: 8.69 ft at 4:00am Feb 2 Observed: 8.69 ft at 5:00am Feb 2 Observed: 8.7 ft at 6:00am Feb 2 Observed: 8.69 ft at 7:00am Feb 2 Observed: 8.69 ft at 8:00am Feb 2 Observed: 8.69 ft at 9:00am Feb 2 Observed: 8.7 ft at 10:00am Feb 2 Observed: 8.71 ft at 11:00am Feb 2 Observed: 8.72 ft at 12:00pm Feb 2 Observed: 8.71 ft at 1:00pm Feb 2 Observed: 8.73 ft at 2:00pm Feb 2 Observed: 8.75 ft at 3:00pm Feb 2 Observed: 8.75 ft at 4:00pm Feb 2 Observed: 8.78 ft at 5:00pm Feb 2 Observed: 8.8 ft at 6:00pm Feb 2 Observed: 8.8 ft at 7:00pm Feb 2 Observed: 8.84 ft at 8:00pm Feb 2 Observed: 8.83 ft at 9:00pm Feb 2 Observed: 8.85 ft at 10:00pm Feb 2 Observed: 8.85 ft at 11:00pm Feb 2 Observed: 8.85 ft at 12:00am Feb 3 Observed: 8.84 ft at 1:00am Feb 3 Observed: 8.86 ft at 2:00am Feb 3 Observed: 8.84 ft at 3:00am Feb 3 Observed: 8.86 ft at 4:00am Feb 3 Observed: 8.83 ft at 5:00am Feb 3 Observed: 8.82 ft at 6:00am Feb 3 Observed: 8.82 ft at 7:00am Feb 3 Observed: 8.81 ft at 8:00am Feb 3 Observed: 8.78 ft at 9:00am Feb 3 Observed: 8.8 ft at 10:00am Feb 3 Observed: 8.78 ft at 11:00am Feb 3 Observed: 8.75 ft at 12:00pm Feb 3 Observed: 8.74 ft at 1:00pm Feb 3 Observed: 8.74 ft at 2:00pm Feb 3 Observed: 8.73 ft at 3:00pm Feb 3 Observed: 8.72 ft at 4:00pm Feb 3 Observed: 8.71 ft at 5:00pm Feb 3 Observed: 8.71 ft at 6:00pm Feb 3 Observed: 8.71 ft at 7:00pm Feb 3 Observed: 8.72 ft at 8:00pm Feb 3 Observed: 8.72 ft at 9:00pm Feb 3 Observed: 8.72 ft at 10:00pm Feb 3 Observed: 8.73 ft at 11:00pm Feb 3 Observed: 8.75 ft at 12:00am Feb 4 Observed: 8.74 ft at 1:00am Feb 4 Observed: 8.74 ft at 2:00am Feb 4 Observed: 8.73 ft at 3:00am Feb 4 Observed: 8.73 ft at 4:00am Feb 4 Observed: 8.72 ft at 5:00am Feb 4 Observed: 8.71 ft at 6:00am Feb 4 Observed: 8.72 ft at 7:00am Feb 4 Observed: 8.71 ft at 8:00am Feb 4 Observed: 8.72 ft at 9:00am Feb 4 Observed: 8.7 ft at 10:00am Feb 4 Observed: 8.7 ft at 11:00am Feb 4 Observed: 8.7 ft at 12:00pm Feb 4 Observed: 8.7 ft at 1:00pm Feb 4 Observed: 8.71 ft at 2:00pm Feb 4 Observed: 8.72 ft at 3:00pm Feb 4 Observed: 8.72 ft at 4:00pm Feb 4 Observed: 8.73 ft at 5:00pm Feb 4 Observed: 8.73 ft at 6:00pm Feb 4 Observed: 8.75 ft at 7:00pm Feb 4 Observed: 8.76 ft at 8:00pm Feb 4 Observed: 8.75 ft at 9:00pm Feb 4 Observed: 8.77 ft at 10:00pm Feb 4 Observed: 8.8 ft at 11:00pm Feb 4 Observed: 8.8 ft at 12:00am Feb 5 Observed: 8.79 ft at 1:00am Feb 5 Observed: 8.82 ft at 2:00am Feb 5 Observed: 8.8 ft at 3:00am Feb 5 Observed: 8.8 ft at 4:00am Feb 5 Observed: 8.79 ft at 5:00am Feb 5 Observed: 8.8 ft at 6:00am Feb 5 Observed: 8.8 ft at 7:00am Feb 5 Observed: 8.79 ft at 8:00am Feb 5 Observed: 8.77 ft at 9:00am Feb 5 Observed: 8.78 ft at 10:00am Feb 5 Observed: 8.79 ft at 11:00am Feb 5 Observed: 8.77 ft at 12:00pm Feb 5 Observed: 8.77 ft at 1:00pm Feb 5 Observed: 8.75 ft at 2:00pm Feb 5 Observed: 8.76 ft at 3:00pm Feb 5 Observed: 8.77 ft at 4:00pm Feb 5 Observed: 8.78 ft at 5:00pm Feb 5 Observed: 8.79 ft at 6:00pm Feb 5 Observed: 8.8 ft at 7:00pm Feb 5 Observed: 8.79 ft at 8:00pm Feb 5 Observed: 8.79 ft at 9:00pm Feb 5 Observed: 8.81 ft at 10:00pm Feb 5 Observed: 8.82 ft at 11:00pm Feb 5 Observed: 8.82 ft at 12:00am Feb 6 Observed: 8.82 ft at 1:00am Feb 6 Observed: 8.82 ft at 2:00am Feb 6 Observed: 8.8 ft at 3:00am Feb 6 Observed: 8.81 ft at 4:00am Feb 6 Observed: 8.8 ft at 5:00am Feb 6 Observed: 8.8 ft at 6:00am Feb 6 Observed: 8.8 ft at 7:00am Feb 6 Observed: 8.79 ft at 8:00am Feb 6 Observed: 8.78 ft at 9:00am Feb 6 Observed: 8.77 ft at 10:00am Feb 6 Observed: 8.77 ft at 11:00am Feb 6 Observed: 8.75 ft at 12:00pm Feb 6 Observed: 8.74 ft at 1:00pm Feb 6 Observed: 8.72 ft at 2:00pm Feb 6 Observed: 8.71 ft at 3:00pm Feb 6 Observed: 8.69 ft at 4:00pm Feb 6 Observed: 8.68 ft at 5:00pm Feb 6 Observed: 8.68 ft at 6:00pm Feb 6 Observed: 8.66 ft at 7:00pm Feb 6 Observed: 8.66 ft at 8:00pm Feb 6 Observed: 8.65 ft at 9:00pm Feb 6 Observed: 8.63 ft at 10:00pm Feb 6 Observed: 8.64 ft at 11:00pm Feb 6 Observed: 8.61 ft at 12:00am Feb 7 Observed: 8.6 ft at 1:00am Feb 7 Observed: 8.59 ft at 2:00am Feb 7 Observed: 8.57 ft at 3:00am Feb 7 Observed: 8.57 ft at 4:00am Feb 7 Observed: 8.56 ft at 5:00am Feb 7 Observed: 8.55 ft at 6:00am Feb 7 Observed: 8.53 ft at 7:00am Feb 7 Observed: 8.52 ft at 8:00am Feb 7 Observed: 8.51 ft at 9:00am Feb 7 Observed: 8.51 ft at 10:00am Feb 7 Observed: 8.49 ft at 11:00am Feb 7 Observed: 8.48 ft at 12:00pm Feb 7 Observed: 8.48 ft at 1:00pm Feb 7 Observed: 8.47 ft at 2:00pm Feb 7 Observed: 8.47 ft at 3:00pm Feb 7 Observed: 8.46 ft at 4:00pm Feb 7 Observed: 8.44 ft at 5:00pm Feb 7 Observed: 8.44 ft at 6:00pm Feb 7 Observed: 8.42 ft at 7:00pm Feb 7 Observed: 8.41 ft at 8:00pm Feb 7 Observed: 8.41 ft at 9:00pm Feb 7 Observed: 8.41 ft at 10:00pm Feb 7 Observed: 8.4 ft at 11:00pm Feb 7 Observed: 8.39 ft at 12:00am Feb 8 Observed: 8.38 ft at 1:00am Feb 8 Observed: 8.37 ft at 2:00am Feb 8 Observed: 8.36 ft at 3:00am Feb 8 Observed: 8.36 ft at 4:00am Feb 8 Observed: 8.35 ft at 5:00am Feb 8 Observed: 8.33 ft at 6:00am Feb 8 Observed: 8.33 ft at 7:00am Feb 8 Observed: 8.32 ft at 8:00am Feb 8 Observed: 8.3 ft at 9:00am Feb 8 Observed: 8.29 ft at 10:00am Feb 8 Observed: 8.28 ft at 11:00am Feb 8 Observed: 8.27 ft at 12:00pm Feb 8 Observed: 8.27 ft at 1:00pm Feb 8 Observed: 8.26 ft at 2:00pm Feb 8 Observed: 8.26 ft at 3:00pm Feb 8 Observed: 8.25 ft at 4:00pm Feb 8 Observed: 8.25 ft at 5:00pm Feb 8 Observed: 8.23 ft at 6:00pm Feb 8 Observed: 8.24 ft at 7:00pm Feb 8 Observed: 8.23 ft at 8:00pm Feb 8 Observed: 8.22 ft at 9:00pm Feb 8 Observed: 8.21 ft at 10:00pm Feb 8 Observed: 8.18 ft at 11:00pm Feb 8 Observed: 8.19 ft at 12:00am Feb 9 Observed: 8.17 ft at 1:00am Feb 9 Observed: 8.15 ft at 2:00am Feb 9 Observed: 8.15 ft at 3:00am Feb 9 Observed: 8.15 ft at 4:00am Feb 9 Observed: 8.14 ft at 5:00am Feb 9 Observed: 8.11 ft at 6:00am Feb 9 Observed: 8.11 ft at 7:00am Feb 9 Observed: 8.1 ft at 8:00am Feb 9 Observed: 8.1 ft at 9:00am Feb 9 Observed: 8.08 ft at 10:00am Feb 9 Observed: 8.08 ft at 11:00am Feb 9 Forecast: 8.05 ft at 10:00am Feb 9 Forecast: 7.96 ft at 4:00pm Feb 9 Forecast: 7.88 ft at 10:00pm Feb 9 Forecast: 7.79 ft at 4:00am Feb 10 Forecast: 7.71 ft at 10:00am Feb 10 Forecast: 7.63 ft at 4:00pm Feb 10 Forecast: 7.56 ft at 10:00pm Feb 10 Forecast: 7.52 ft at 4:00am Feb 11 Forecast: 7.56 ft at 10:00am Feb 11 Forecast: 7.74 ft at 4:00pm Feb 11 Forecast: 8.13 ft at 10:00pm Feb 11 Forecast: 8.9 ft at 4:00am Feb 12 Forecast: 9.8 ft at 10:00am Feb 12 Forecast: 10.79 ft at 4:00pm Feb 12 Forecast: 11.7 ft at 10:00pm Feb 12 Forecast: 12.48 ft at 4:00am Feb 13 Forecast: 13.1 ft at 10:00am Feb 13 Forecast: 13.58 ft at 4:00pm Feb 13 Forecast: 14.2 ft at 10:00pm Feb 13 Forecast: 15.01 ft at 4:00am Feb 14 Forecast: 16.14 ft at 10:00am Feb 14 Forecast: 17.29 ft at 4:00pm Feb 14 Forecast: 18.06 ft at 10:00pm Feb 14 Forecast: 18.4 ft at 4:00am Feb 15 Forecast: 18.48 ft at 10:00am Feb 15 Forecast: 18.42 ft at 4:00pm Feb 15 Forecast: 18.28 ft at 10:00pm Feb 15 Forecast: 18.11 ft at 4:00am Feb 16 Forecast: 17.92 ft at 10:00am Feb 16 Forecast: 17.76 ft at 4:00pm Feb 16 Forecast: 17.47 ft at 10:00pm Feb 16 Forecast: 17.13 ft at 4:00am Feb 17 Forecast: 16.77 ft at 10:00am Feb 17 Forecast: 16.41 ft at 4:00pm Feb 17 Forecast: 15.96 ft at 10:00pm Feb 17 Forecast: 15.4 ft at 4:00am Feb 18 Forecast: 14.79 ft at 10:00am Feb 18 Forecast: 14.1 ft at 4:00pm Feb 18 Forecast: 13.38 ft at 10:00pm Feb 18 Forecast: 12.74 ft at 4:00am Feb 19 Graph Created (1:47pm Feb 9, 2010) Observed Forecast (issued 9:32am Feb 9) USGS--Water Resources of the United States CRPW1 (plotting HGIRG) Gage 0 Datum: 23.64 Latest observed value: 8.08 ft at 11:00 AM PST 9-Feb-2010. Flood Stage is 21.0 ft. Stage (ft) Flow (kcfs)
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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

Historical Crests
(1) 26.05 ft on 12/05/2007
(2) 25.22 ft on 02/09/1996
(3) 24.74 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

Low Water Records
(1) 2.2 ft on 10/17/1952

 Chehalis River at Porter location map

Flood Impacts Collapse
25.0 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.
23.0 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.
22.0 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.
21.0 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.
19.0 the Chehalis River in Grays Harbor County will locally spill over its banks with shallow water on several roads.

About This Location Collapse
Latitude: 46.938100° N, Longitude: 123.312000° W, Horizontal Datum: NAD83

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 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 N/A N/A Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other 23.64 ft 44.64 ft  

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Porter

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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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