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Scientific Investigations Report 2009–5123

Hydrology of the Johnson Creek Basin, Oregon

Table 2. Streamflow and specific conductance measurements used in seepage analysis, Johnson Creek, Oregon.

[Map numbers are shown in table 1. Streamflow: (a) from rating curve; (b) measured at RM 2.4; (c) from rating curve at Johnson Creek at Milwaukie, Oregon (map number 41), less flow of Crystal Springs Creek (map number 40); (d) sum of streamflow measurements at map number 37 and map number 40. Abbreviations: ft3/s: cubic foot per second, µS/cm: microsiemens per centimeter at 25 degrees Celsius, RM: river mile]

Map
No.
Site name
Johnson Creek at:
River mile September 1988   September 1997   August 1998   August 1999   September 1999   August 2000   October 2006
Streamflow (ft3/s) Streamflow (ft3/s) Streamflow (ft3/s) Specific conduc-tance (µS/cm) Streamflow (ft3/s) Specific conduc-tance (µS/cm) Streamflow (ft3/s) Specific conduc-tance (µS/cm) Streamflow (ft3/s) Streamflow (ft3/s) Specific conductance (µS/cm)
25 Palmblad Road 17.2 0.08     0.81 123   0.86 137     0.49   0.59 129
26 Regner Road 15.8 1.02 137 1.02 139 .72 (a) 1.49 140
27 Walters Road 14.5 .42 1.36 145 1.24 148 .70
28 190th Avenue 12.6 .47 1.83 147 1.62 139 1.16
30 Sycamore 10.2 .64 (a) 5.2 (a) 2.52 152 2.25 146 1.96 (a) 152 1.77 (a) 2.41 152
31 Brookside Park 7.8 .74 2.38 149 1.87 152 1.46
32 82nd Avenue 5.5 .92 4.8 2.43 151 2.02 140 1.31 2.46 143
33 45th Avenue 3.2 1.35 6.1 3.56 200 3.50 206 2.36 2.62 175
36 Berkeley Place 2.2 3.45 (b) 5.53 226 5.90 228 3.99 3.35 194
37 Sherrett Street 1.2 2.91 9.9 (c) 5.69 222 5.55 226 3.55 3.54 192
41 Milwaukie 0.7 13.4 (d) 31.0 (a) 21.8 218 22.0 (a) 17.0 14.0 195
Summary: Seepage values in bold are greater than the measurement uncertainty
Upper reach RM 17.2 to RM 10.2   0.56     1.71   1.39     1.28   1.82
Middle reach RM 10.2 to RM 5.5 .28 -0.4 -0.09     0.06   -.46 .05  
Lower reach RM 5.5 to RM 0.7 12.5 26.2 19.4     20.0   15.7 11.5  
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For additional information contact:

Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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