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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 1. Land cover and other watershed characteristics for 28 streams sampled during the urbanization gradient study, Willamette River basin and surrounding area, Oregon and Washington.

[See figure 4 for site locations. Sites are sorted by urban intensity index (UII). Shading represents low, medium, high, and very high UII scores. Abbreviations: km2, square kilometer; USGS, U.S. Geological Survey; SW, southwest; OR, Oregon, WA, Washington]

Site
identification No.		 Site name USGS
station No.		 Area
(km2)		 Urban
intensity index		 Urban
(percent)		 Agriculture
(percent)		 Mean impervious
surface
(percent)
1 Beaverton Creek near SW 216th Avenue, near Orenco, OR 14206435 96 100 83 1 40
2 Claggett Creek at Keizer, OR1 450022123012400 25 100 98 0 55
3 Fanno Creek at Durham, OR 14206950 81 96 84 1 39
4 Pringle Creek at Salem, OR1 445551123015800 25 88 89 6 42
5 Kellogg Creek at Milwaukie, OR1 452526122364400 34 88 81 2 39
6 Amazon Creek near Danebo Road, at Eugene, OR 440257123103200 50 77 62 8 29
7 Tryon Creek below Nettle Creek, near Lake Oswego, OR 14211315 17 72 60 0 23
8 Curtin Creek near Vancouver, WA 454321122352300 30 69 72 16 29
9 Johnson Creek at Circle Avenue, OR 452912122291200 56 59 42 24 17
10 Battle Creek near Turner, OR 445029122592600 30 58 33 40 13
11 Rock Creek at Quatama Road, near Hillsboro, OR 14206347 67 51 28 26 13
12 Whipple Creek near Salmon Creek, WA1 454510122424900 22 49 38 19 14
13 Chicken Creek near Sherwood, OR 14206750 40 45 22 36 9
14 North Fork Deep Creek at Barton, OR1 452337122243500 37 39 27 48 10
15 Oak Creek at Corvallis, OR 443326123165200 33 39 7 19 3
16 Tickle Creek near Boring, OR1 452414122213200 34 32 19 34 8
17 Chehalem Creek at Newberg, OR 451734122585400 98 29 9 44 3
18 Silk Creek near Cottage Grove, OR 434745123040200 42 24 3 11 1
19 Rock Creek near Battleground, WA1 455122122310600 26 23 8 7 2
20 Salmon Creek near Battleground, WA1 454549122295800 59 20 13 2 3
21 Deep Creek near Sandy, OR1 452231122200000 31 17 4 30 1
22 Nate Creek near Colton, OR 14199710 29 15 2 12 1
23 Milk Creek at Camp Adams, OR 450955122291200 104 12 2 9 1
24 South Scappoose Creek at Scappoose, OR 454543122524900 65 8 3 3 1
25 North Yamhill Creek near Yamhill, OR 452149123194900 66 8 1 0 0
26 Lost Creek near Dexter, OR 435212122483300 83 6 0 1 0
27 Iler Creek near Forest Grove, OR 453506123125700 13 4 0 5 0
28 East Fork Dairy Creek near Meacham Corner, OR1 14205400 88 0 1 1 0

1 High frequency sampling sites, which spanned the full range of the UII, were used to determine whether the degree of urbanization affected the seasonality of water chemistry.

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