Effects of Urbanization on Stream Ecosystems in the Willamette River Basin and Surrounding Area, Oregon and Washington

Scientific Investigations Report 2006–5101–D

Table 5. Summary statistics of pesticide concentrations collected during spring and summer 2004, Willamette River basin and surrounding area, Oregon and Washington.

[Pesticide concentrations are in micrograms per liter. Sites are sorted by urban intensity index (UII). Shading from light to dark represents low, medium, high, and very high UII scores. Abbreviations: OR, Oregon; WA, Washington; SW, southwest. Symbols: ≥, greater than or equal to; >, greater than; <, less than; ≤, less than or equal to]

Site name	UII	Sum pesticide		Sum pesticides (spring and summer)
Spring	Summer	Insecticide	Herbicide	Fungicide
Beaverton Creek near SW 216th Avenue near Orenco, OR	100	0.077	0.053		0.012	0.090	0.028
Claggett Creek at Keizer, OR	100	.100	.105		.042	.167	0
Fanno Creek at Durham, OR	96	.132	.055		.079	.094	.014
Pringle Creek at Salem, OR	88	.050	.037		.003	.084	0
Kellogg Creek at Milwaukie, OR	88	.064	.065		.006	.123	0
Amazon Creek near Danebo Road at Eugene, OR	77	.068	.062		.096	.034	0
Tryon Creek below Nettle Creek, near Lake Oswego, OR	72	.025	.066		.037	.054	0
Curtin Creek near Vancouver, WA	69	.026	.007		0	.029	.004
Johnson Creek at Circle Avenue, OR	59	.361	.225		.022	.498	.066
Battle Creek near Turner, OR	58	2.08	.158		.026	2.21	0
Rock Creek at Quatama Road near Hillsboro, OR	51	.214	.055		.054	.220	0
Whipple Creek near Salmon Creek, WA	49	.014	0		.002	.012	0
Chicken Creek near Sherwood, OR	45	.083	.035		.016	.102	0
North Fork Deep Creek at Barton, OR	39	.259	.161		.019	.354	.047
Oak Creek at Corvallis, OR	39	.008	0		0	.008	0
Tickle Creek near Boring, OR	32	.049	.058		.011	.071	.025
Chehalem Creek at Newberg, OR	29	.190	.057		.019	.232	0
Silk Creek near Cottage Grove, OR	24	.018	.038		0	.056	0
Rock Creek near Battleground, WA	23	.060	.015		.038	.002	.035
Salmon Creek near Battleground, WA	20	0	0		0	0	0
Deep Creek near Sandy, OR	17	.039	.018		0	.054	.003
Nate Creek near Colton, OR	15	.023	.002		0	.025	0
Milk Creek at Camp Adams, OR	12	.018	.005		0	.023	0
South Scappose Creek at Scappose, OR	8	.004	0		0	.004	0
North Yamhill Creek near Yamhill, OR	8	0	.010		0	.010	0
Lost Creek near Dexter, OR	6	.007	0		0	.007	0
Iler Creek near Forest Grove, OR	4	0	0		0	0	0
East Fork Dairy Creek near Meacham Corner, OR	0	.013	0		0	.013	0
Total	3.99	1.29

Site name

UII

Sum pesticide

Sum pesticides (spring and summer)

Spring

Summer

Insecticide

Herbicide

Fungicide

Beaverton Creek near SW 216th Avenue near Orenco, OR

100

0.077

0.053

0.012

0.090

0.028

Claggett Creek at Keizer, OR

100

.100

.105

.042

.167

Fanno Creek at Durham, OR

.132

.055

.079

.094

.014

Pringle Creek at Salem, OR

.050

.037

.003

.084

Kellogg Creek at Milwaukie, OR

.064

.065

.006

.123

Amazon Creek near Danebo Road at Eugene, OR

.068

.062

.096

.034

Tryon Creek below Nettle Creek, near Lake Oswego, OR

.025

.066

.037

.054

Curtin Creek near Vancouver, WA

.026

.007

.029

.004

Johnson Creek at Circle Avenue, OR

.361

.225

.022

.498

.066

Battle Creek near Turner, OR

2.08

.158

.026

2.21

Rock Creek at Quatama Road near Hillsboro, OR

.214

.055

.054

.220

Whipple Creek near Salmon Creek, WA

.014

.002

.012

Chicken Creek near Sherwood, OR

.083

.035

.016

.102

North Fork Deep Creek at Barton, OR

.259

.161

.019

.354

.047

Oak Creek at Corvallis, OR

.008

Tickle Creek near Boring, OR

.049

.058

.011

.071

.025

Chehalem Creek at Newberg, OR

.190

.057

.019

.232

Silk Creek near Cottage Grove, OR

.018

.038

.056

Rock Creek near Battleground, WA

.060

.015

.038

.002

.035

Salmon Creek near Battleground, WA

Deep Creek near Sandy, OR

.039

.018

.054

.003

Nate Creek near Colton, OR

.023

.002

.025

Milk Creek at Camp Adams, OR

.018

.005

.023

South Scappose Creek at Scappose, OR

.004

North Yamhill Creek near Yamhill, OR

.010

Lost Creek near Dexter, OR

.007

Iler Creek near Forest Grove, OR

East Fork Dairy Creek near Meacham Corner, OR

.013

Total

3.99

1.29

Urban intensity index	Averages
UII ≥ 70	89	0.074	0.063	0.039	0.092	0.006
UII > 25 – < 70	47	.329	.076	.017	.374	.014
UII > 10 – ≤ 25	19	.026	.013	.006	.027	.006
UII ≤ 10	5	.005	.002	0	.007	0

Urban intensity
index

Averages

UII ≥ 70

0.074

0.063

0.039

0.092

0.006

UII > 25 – < 70

.329

.076

.017

.374

.014

UII > 10 – ≤ 25

.026

.013

.006

.027

.006

UII ≤ 10

.005

.002

.007

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