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2 Streamwater Quality at Selected Sites in the Fraser River Basin, Grand County, Colorado, Water Years 1991-2000 <br />Colorado giver <br />105 52 30 <br />106 Granby <br />1 <br /> <br />7 <br />40° <br />C,e, <br />T ernash .513 <br /> ma <br />? <br /> Y,o1eC reek - -ti0 8 <br />c, 4 A <br /> <br /> <br /> Grand County <br /> _ Et'oo r Fraser <br /> L 7 <br /> Fraser River <br />B <br />i i, 3 <br />? <br /> as <br />n <br />COLORADO _ <br />_ <br />? ?'J ? 4Vinte <br /> LEI 2 <br /> 39°52'30" ism oft <br />V <br />EX PLANATION <br /> a <br /> Private property ? <br /> Arapahoe National Forest <br /> <br />U.S. Highway 40 Vasquez Water <br />Tunnel <br /> Continental divide <br /> wastewater treatment plant Be P <br />A, Sampling site with site number <br />c0/V <br />1 <br /> T/1VCrV <br />TA L o?vO- <br />05°45' <br />_?j <br />I <br />SS <br />QW <br />Park /-t <br />lW <br />it We rTunnel. <br />Z <br />VO <br />I <br />0 2 4 6 MILES <br />0 2 4 6 KILOMETERS <br />Figure 1. The Fraser River Basin. <br />Purpose and Scope <br />Data Collection and Analysis <br />This report presents an overview of the general stream- <br />water quality at 13 sites in the Fraser River Basin during <br />water years 1991-2000, and focuses primarily on chloride, <br />nutrient, pH, dissolved oxygen, and fecal coliform bacteria <br />data (a water year is defined as the 12-month period from <br />October 1 through September 30 of the named year). Data <br />from these sites were compared to Colorado's current State <br />stream-segment water-quality standards (hereinafter referred <br />to as "State standards") for the Fraser River established by the <br />Colorado Water Quality Control Commission (2001). Under <br />these guidelines, the Fraser River and its tributaries are under <br />the designations of the Upper Colorado River segments 9 <br />and 10. The data were compared spatially in downstream <br />order and assessed for trends at selected sites that had at <br />least 5 years of monthly data. <br />Water-quality data were collected between <br />October 1, 1990, and September 30, 2000, at 13 stream <br />sites (fig. 1, tables 1, 2, and 3). These sites include six <br />sites on the main stem of the Fraser River, four sites <br />on Crooked and Pole Creeks, and three sites on Ranch <br />and Hurd Creeks. Three sites have data spanning the <br />entire period of record while the other sites have partial <br />records (table 1). All data for this report were collected <br />and analyzed by the U.S. Geological Survey using <br />methods described in Fishman (1993) and Fishman and <br />Friedman (1989). Water-quality samples were collected <br />using the equal-width increment (EWI) method and <br />processed using steps outlined in the U.S. Geological <br />Survey National Field Manual (U.S. Geological Survey, <br />1999).