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Scientific Investigations Report 2012–5017


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Geomorphic Setting, Aquatic Habitat, and Water-Quality Conditions of the Molalla River, Oregon, 2009–10


Table 2. Sites sampled on the Molalla River, Oregon, and details of specific data collected during July–October 2010.


[Abbreviations: Rkm, river kilometer; DD, decimal degrees; USGS, U.S. Geological Survey; m, meter; N/A, none available]

Site/reach name USGS site identifier Data type Date collected Approximate
Rkm		 Latitude north
(DD)		 Longitude west
(DD)		 Elevation
(m)		 Geomorphic reach
Molalla River at Glen
Avon Bridge		 450453122291000 Wolman pebble count Sept. 2, 2010 44.32 45.0800 122.4857 163 GR6
    Water quality-nutrients and 

field parameters		 Aug. 2–3 and 

Sept. 14–15, 2010		 44.20 45.0811 122.4860 163
    Benthic algae July 30 and 

Aug. 15, 2010
    Cross section survey Sept. 2, 2010 44.19 45.0811 122.4862 162
    Wolman Pebble count Sept. 2, 2010 44.12 45.0818 122.4862 161
Molalla River near Dickey
Prairie Road 		N/A Wolman pebble count Sept. 8, 2010 40.58 45.0997 122.5162 146 GR5
Molalla River at Feyrer
Park Road		 N/A Cross section survey Sept. 2, 2010 34.43 45.1393 122.5338 112
    Wolman pebble count Sept. 2, 2010 34.42 45.1394 122.5339 112
Molalla River at
Highway 211 		450943122320400 Wolman pebble count Sept. 2, 2010 31.11 45.1610 122.5348 97 GR4
    Water quality-nutrients and 

field parameters		 Sept. 2, 2010 31.07 45.1612 122.5353 97
    Benthic algae July 30 and
Aug. 15, 2010
    Cross section survey Sept. 2, 2010 30.92 45.1625 122.5351 96
Molalla River at
Highway 213 		451200122345800 Water quality-nutrients and
field parameters		 Aug. 2–3 and 

Sept. 14–15, 2010		 23.40 45.1991 122.5780 72
    Benthic algae July 30 and 

Aug. 15, 2010
    Wolman pebble count Sept. 2, 2010 22.94 45.1999 122.5819 70
    Cross section survey Sept. 1, 2010 22.84 45.2001 122.5832 70
Molalla River at railroad
bridge		 N/A Wolman pebble count Oct. 4, 2010 16.18 45.2280 122.6334 50 GR3
Molalla River near Canby
at Highway 170 /
Goods Bridge		 14200000 Wolman pebble count Sept. 8, 2010 10.74 45.2448 122.6837 34
    Water quality-nutrients and 

field parameters		 Aug. 2–3 and 

Sept. 14–15, 2010		 10.50 45.2444 122.6867 33
    Benthic algae July 30 and 

Aug. 15, 2010
    Cross section survey Sept. 2, 2010 10.36 45.2444 122.6885 33 GR2
Molalla River at
Highway 99E 		N/A Wolman pebble count Sept. 8, 2010 6.72 45.2547 122.7063 27
Molalla River at Knights
Bridge Road 		451603122423301 Water quality-nutrients and 

field parameters		 Aug. 2–3 and 

Sept. 14–15, 2010		 4.75 45.2688 122.7103 23
    Benthic algae July 30 and 

Aug. 15, 2010

First posted February 29, 2012

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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