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<br />,;,.-.- <br /> <br />'.'--',j <br /> <br />" <br /> <br />5::~1 <br />f;r,j <br /> <br />Mosquito Creek above its confluence with South Mosquito Creek exhibits <br /> <br />~elevated concentrations of lead during springtime snowmelt. The source of the <br />~ <br />~lead appears to be the mill tailings found in the vicinity of the North London <br />N <br />Mine. Downstream of the confluence of South Mosquito Creek, Mosquito Creek <br /> <br />;7.<;' <br />{j <br />H carries acutely toxic levels of zinc and lead. Near the Town of Park City, <br /> <br />;il <br /> <br />r~ <br />. ,'~ <br />l~' ~ <br /> <br />.~ <br />\1 <br />=:;-:.i <br /> <br />'.'.'1' <br />:,~.. <br />'~:~;'. <br />.,..,'-:' <br />...~:~ <br /> <br />,",., <br />, <br />'~.:~i <br />k;':~ <br /> <br />~(~ <br /> <br />H'" <br />f;.':_':; <br /> <br />~'..';~ <br /> <br /> <br />the Montgomery Mill tailings are an additional source of metals which <br /> <br />contribute to elevated concentrations in Mosquito Creek. Downstream of <br /> <br />Mosquito Creek in the Middle Fork of the South Platte elevated concentrations <br /> <br /> <br />of zinc are still exhibited through and below .the Town .of Fairplay. <br /> <br />. <br /> <br />Erosion problems have been identified in the upper reaches of the South Platte <br /> <br />in Park and Teller Counties. Above Elevenmile Canyon Reservoir, the South <br /> <br />Platte, Trout Creek, High Creek, Sacramento Creek, Fourmile Creek, and the <br /> <br />Middle and South Forks have all been noted for erosion problems related to <br /> <br />agricultural activities. The Elevenmile Canyon.stretch, and Twin Creek have <br /> <br />been identified as having similar problems. Tarryall Creek and its <br /> <br />tributaries Rock Creek, Jefferson Creek, Michigan Creek, .and Park Creek also <br /> <br />are noted for erosion and agricultural impacts. The sediments from these <br /> <br />erosion areas probably settle out in reservoirs such as Antero, Tarryall, <br /> <br />Cheeseman, and Elevenmile all of which support excellent cold water <br /> <br />fisheries. It would appear that these erosion problems create only minor <br /> <br />problems in the headwaters, region of the'South Platte. Much of the water in <br /> <br />the Upper South Platte which has been traditionally used for agriculture, is <br /> <br />now owned by municipalities. It is believed that this change in use will <br /> <br />reduce sediment yields. <br /> <br />-54- <br />