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FEMA High Water Marks - Western Washington Flood, January 2009


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Links to Google-Map displays of the data by river reach are located at the bottom of this page

Quality of the High-Water Mark (HWM) (after Lumia, R., Burke, P.M., and Johnston, W. H., 1986, Flooding of December 29, 1984 through January 2, 1985, in northern New York State, with flood profiles of the Black and Salmon Rivers, U.S. Geological Survey Water-Resources Investigations Report WRIR 86-4191, 53p.)

Accuracy (ft.)
Excellent (E)+/- 0.02
Good (G)+/- 0.05
Fair (F)+/- 0.10
Poor (P)>+/- 0.10
No Rating Reported (--)

HWM Code: The first two letters of the HWM code refer to the reach where the mark was flagged. The number following the two-letter code is the sequential number that the mark was flagged. Additional numbers such as SA-94-2 refers to a second mark that is unflagged and surveyed near the flagged mark (SA-94 in this example).

First Two Letters
River/Creek Reach
Reach Length (miles)
SSSnoqualmie River near Snoqualmie2.5
SCSnoqualmie River near Carnation3.0
TCTolt River near Carnation2.0
CRCedar River near Renton3.0
POPuyallup River near Orting5.0
SPSouth Prairie Creek At South Prairie1.5
NCNewaukum River near Chehalis7.0
SAStillaguamish River near Arlington6.0
Total = 30.0

A listing of surveyed HWMs by reach with HWM code, latitude and longitude, elevation, and quality of the mark

Google Maps:
Cedar River near Renton
Newaukum River near Chehalis
Puyallup River near Orting
South Prairie Creek At South Prairie
Snoqualmie River near Snoqualimie
Snoqualimie-Tolt River near Carnation
Stillaguamish River near Arlington

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