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Scientific Investigations Report 2006–5101–D

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D

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Table 8. Dominant algal taxon (by cell density) at each site, dominant diatom taxon, and diatom water-quality indicator classification, Willamette River basin and surrounding area, Oregon and Washington.

[Sites are sorted by the urban intensity index (UII). Shading indicates sites with UII greater than 25. Water-quality indicator from Porter (2008). Abbreviations: TN, total nitrogen; DO, dissolved oxygen; SW, southwest; OR, Oregon, WA, Washington; DIN, dissolved inorganic nitrogen. Symbols: >, greater than]

Site name UII Dominant algal taxon   Dominant diatom taxon
Division Scientific name Scientific name Diatom water-quality indicator
Beaverton Creek near SW 216th Avenue, near Orenco, OR 100 Red algae Unknown Rhodophyte Florideophycidae Gomphonema kobayasii Preference for high TN
Claggett Creek at Keizer, OR 100 Red algae Unknown Rhodophyte Florideophycidae Gomphonema kobayasii Preference for high TN
Fanno Creek at Durham, OR 96 Blue-green algae Leptolyngbya sp. Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Kellogg Creek at Milwaukie, OR 88 Blue-green algae Homoeothrix janthina Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Pringle Creek at Salem, OR 88 Blue-green algae Homoeothrix janthina Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Amazon Creek near Danebo Road, at Eugene, OR 77 Blue-green algae Leptolyngbya sp. Amphora pediculus Eutrophic/moderate DO (>75 percent)
Tryon Creek below Nettle Creek, near Lake Oswego, OR 72 Blue-green algae Homoeothrix janthina Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Curtin Creek near Vancouver, WA 69 Blue-green algae Homoeothrix janthina Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Johnson Creek at Circle Avenue, OR 59 Red algae Unknown Rhodophyte Florideophycidae Gomphonema kobayasii Preference for high TN
Battle Creek near Turner, OR 58 Blue-green algae Leptolyngbya sp. Preference for high DIN/moderate DO (>75 percent)
Rock Creek at Quatama Road, near Hillsboro, OR 51 Blue-green algae Phormidium autumnale Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Whipple Creek near Salmon Creek, WA 49 Red algae Unknown Rhodophyte Florideophycidae Cocconeis placentula var. lineata Eutrophic/low DO (>50 percent)
Chicken Creek near Sherwood, OR 45 Red algae Unknown Rhodophyte Florideophycidae Nupela sp. Unknown
North Fork Deep Creek at Barton, OR 39 Blue-green algae Porphyrosiphon martensianus Achnanthes subhudsonis var. kraeuselii Unknown
Oak Creek at Corvallis, OR 39 Red algae Unknown Rhodophyte Florideophycidae Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Tickle Creek near Boring, OR 32 Blue-green algae Homoeothrix janthina Achnanthes subhudsonis var. kraeuselii Unknown
Chehalem Creek at Newberg, OR 29 Blue-green algae Homoeothrix janthina Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Silk Creek near Cottage Grove, OR 24 Blue-green algae Unknown Cyanophyte Rhoicosphenia abbreviata Eutrophic/moderate DO (>75 percent)
Rock Creek near Battleground, WA 23 Blue-green algae Aphanocapsa sp. Achnanthidium minutissimum Preference for high DIN/high DO (near 100 percent)
Salmon Creek near Battleground, WA 20 Blue-green algae Homoeothrix janthina Achnanthidium sp. 10 Unknown
Deep Creek near Sandy, OR 17 Diatom Achnanthes subhudsonis var. kraeuselii Achnanthes subhudsonis var. kraeuselii Unknown
Nate Creek near Colton, OR 15 Blue-green algae Homoeothrix janthina Achnanthidium sp. 10 Unknown
Milk Creek at Camp Adams, OR 12 Blue-green algae Phormidium autumnale Gomphonema sp. 2 Unknown
North Yamhill Creek near Yamhill, OR 8 Blue-green algae Unknown Cyanophyte Achnanthidium minutissimum Preference for high DIN/high DO (near 100 percent)
South Scappose Creek at Scappose, OR 8 Blue-green algae Homoeothrix janthina Gomphonema kobayasii Preference for high TN
Lost Creek near Dexter, OR 6 Blue-green algae Homoeothrix janthina Gomphonema rhombicum Unknown
Iler Creek near Forest Grove, OR 4 Blue-green algae Homoeothrix janthina Cocconeis placentula var. euglypta Eutrophic/low DO (>50 percent)
East Fork Dairy Creek near Meacham Corner, OR 0 Blue-green algae Unknown Cyanophyte Achnanthes subhudsonis var. kraeuselii Unknown

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