Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table 12. Single dominant benthic macroinvertebrate taxon at each site, taxon name, U.S. Environmental Protection Agency tolerance value, Ephemeroptera, Plecoptera, and Trichoptera richness, and richness percentage per site, 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. Abbreviations: EPT, Ephemeroptera, Plecoptera, and Trichoptera; USEPA, U.S. Environmental Protection Agency; SW, southwest; OR, Oregon; WA, Washington]
| Site name | UII | Percent dominant taxon |
Dominant taxon |
USEPA tolerance value |
EPT richness |
EPT percent richness |
|---|---|---|---|---|---|---|
| Beaverton Creek near SW 216th Avenue, near Orenco, OR | 100 | 27 | Baetis tricaudatus | 7 | 2 | 11 |
| Claggett Creek at Keizer, OR | 100 | 42 | Tubificidae | 10 | 0 | 0 |
| Fanno Creek at Durham, OR | 96 | 57 | Cheumatopsyche sp. | 8 | 3 | 11 |
| Kellogg Creek at Milwaukie, OR | 88 | 27 | Cheumatopsyche sp. | 8 | 7 | 21 |
| Pringle Creek at Salem, OR | 88 | 49 | Simulium canadense | 7 | 5 | 17 |
| Amazon Creek near Danebo Road, at Eugene, OR | 77 | 35 | Cricotopus bicinctus group | 7 | 1 | 4 |
| Tryon Creek below Nettle Creek, near Lake Oswego, OR | 72 | 30 | Baetis tricaudatus | 7 | 6 | 17 |
| Curtin Creek near Vancouver, WA | 69 | 16 | Cheumatopsyche sp. | 8 | 14 | 36 |
| Johnson Creek at Circle Avenue, OR | 59 | 29 | Cheumatopsyche sp. | 8 | 3 | 12 |
| Battle Creek near Turner, OR | 58 | 51 | Cheumatopsyche sp. | 8 | 3 | 14 |
| Rock Creek at Quatama Road, near Hillsboro, OR | 51 | 37 | Cheumatopsyche sp. | 8 | 3 | 10 |
| Whipple Creek near Salmon Creek, WA | 49 | 16 | Optioservus sp. | 9 | 9 | 27 |
| Chicken Creek near Sherwood, OR | 45 | 38 | Cheumatopsyche sp. | 8 | 6 | 24 |
| North Fork Deep Creek at Barton, OR | 39 | 34 | Baetis tricaudatus | 7 | 3 | 11 |
| Oak Creek at Corvallis, OR | 39 | 31 | Ferrissia sp. | 7 | 6 | 21 |
| Tickle Creek near Boring, OR | 32 | 67 | Simulium canadense | 7 | 2 | 11 |
| Chehalem Creek at Newberg, OR | 29 | 51 | Fluminicola sp. | 7 | 2 | 7 |
| Silk Creek near Cottage Grove, OR | 24 | 28 | Simulium canadense | 7 | 12 | 34 |
| Rock Creek near Battleground, WA | 23 | 14 | Paratanytarsus sp. | 6 | 15 | 36 |
| Salmon Creek near Battleground, WA | 20 | 27 | Rhithrogena sp. | 3 | 15 | 54 |
| Deep Creek near Sandy, OR | 17 | 23 | Baetis tricaudatus | 7 | 14 | 41 |
| Nate Creek near Colton, OR | 15 | 30 | Rhithrogena sp. | 3 | 14 | 50 |
| Milk Creek at Camp Adams, OR | 12 | 23 | Cheumatopsyche sp. | 8 | 18 | 56 |
| North Yamhill Creek near Yamhill, OR | 8 | 36 | Ceratopsyche cockerelli | 5 | 18 | 51 |
| South Scappose Creek at Scappose, OR | 8 | 20 | Rhithrogena sp. | 3 | 8 | 31 |
| Lost Creek near Dexter, OR | 6 | 30 | Rhithrogena sp. | 3 | 16 | 50 |
| Iler Creek near Forest Grove, OR | 4 | 26 | Rhithrogena sp. | 3 | 16 | 37 |
| East Fork Dairy Creek near Meacham Corner, OR | 0 | 18 | Zapada cinctipes | 4 | 18 | 47 |
| Average of sites greater than UII of 25 | 37 | 8 | 4 | 15 | ||
| Average of sites less than UII of 25 | 25 | 5 | 15 | 44 | ||
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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