USGS Scientific Investigations Report 2010–5008 Use of Continuous Monitors and Autosamplers to Predict Unmeasured Water-Quality Constituents in Tributaries of the Tualatin River, Oregon

Table 1. Sampling sites and characteristics in tributaries of the Tualatin River basin, Oregon, 2002–04.

[Target sites are those where data analysis included data from autosampler deployment plus historical data from U.S. Geological Survey and Clean Water Services databases, and model development included more extensive calibration and validation processes. Non-target sites were sites included in this study but where data analysis was limited to preliminary identification of model forms based on analysis of autosampler data alone. The site at Fanno Creek was moved from Durham City Park to Durham Road in 2003. Latitude and Longitude, in degrees, minutes, seconds, are based on North American Datum of 1927 (NAD 27). Streamflow data source: Stream-flow data were obtained from U.S. Geological Survey (USGS) or Oregon Water Resources Department (OWRD) gaging stations. Data from on-site gaging stations were used directly; data from upstream gaging stations were routed and travel times estimated as described in text. Drainage areas are from StreamStats (http://water.usgs.gov/osw/streamstats/index.html). Abbreviations: mi, mile; mi², square mile]

Station name	Map No.	Station identification No.	Latitude	Longitude	Streamflow data source	Drainage area (mi²)	Primary upstream land use	Monitor deployment dates
Target sites
Fanno Creek at Durham City Park	1a	452348122454701	45°23′49″	122°45′43″	USGS (0.25 miupstream)	31.7	Urban	Spring–autumn, 2001–02
Fanno Creek at Durham Road	1b	14206950	45°24’13”	122°45’13”	USGS	31.5	Urban	Continuous, September 2002–current
Dairy Creek at Highway 8	2	453113123003501	45°31′13″	123°00′35″	OWRD	229	Agricultural	Spring-autumn, 2001–03; Continuous, 2004–current
Non-target sites
Beaverton Creek at SW 170th Avenue	3	453004122510301	45°30′04″	122°51′03″	Routed from upstream OWRD gaging stations	22.8	Urban	Spring–autumn, 2001–03; Continuous, 2004–current
Chicken Creek at Scholls-Sherwood Highway	4	452230122512201	45°22′30″	122°51′22″	OWRD	15.3	Urban and agricultural	Spring–autumn, 2001–current
Rock Creek at Woll Pond Way near Hillsboro	5	453104122551201	45°31′04″	122°55′12″	Routed from upstream OWRD gaging stations	65	Urban	Spring–autumn, 2001–03
Gales Creek at Old Highway 47	6	453040123065201	45°30′40″	123°06′52″	OWRD	74.7	Forested	Spring–autumn, 2001–06; Continuous, 2007–current