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<br />. <br /> <br />west of Denver, Colorado. A vicinity map of Frisco is shown in Figure I. The average <br />high temperature in January is about 32 degrees Fahrenheit, while the average low is <br />about zero degrees. The average high temperature in July is about 75 degrees, while the <br />average low is about 37 degrees. Frisco receives an average of about 12 feet of snow <br />annually. The average annual precipitation is 16.7 inches (water equivalent), of which 9 <br />inches is from snowfall. The 1995 base population of Frisco is estimated to be about <br />2,100, with a seasonal peak population of about 9,600. The economy is based on tourism <br />and the ski industry. Most Frisco residents are employed in the service industry which <br />includes restaurants, retail trade, recreation, and lodging. Construction, finance, and real <br />estate also employ a large portion ofthe population. <br /> <br />Site Description <br />Tenmile Creek flows easterly through Frisco and discharges into Dillon Reservoir just <br />downstream of U.S. Highway 9. Tenmile Creek at Frisco has a drainage area of about 94 <br />square miles, all of which is in Summit County. The western boundary of the basin is <br />formed by the Gore Mountain Range and Vail Pass. "hile the eastern boundary is the <br />Tenmile Mountain Range. The basin is defined W Ih,' "'lith by the Continental Divide. <br />Vegetation along Tenmile Creek through Frisco mall1l) COlblStS of sparse coniferous trees <br />along with scattered brush and willows. The channel bed IS mostly cobble material with <br />some bonlders. Development along Tenmile Creek mainly consists of single family <br />residential structures and several condominium units. <br /> <br />. <br /> <br />Site Specific Problems <br />The right (south) bank of Tenmile Creek from Highway') to 4th Avenue is developed <br />with single family residential structures, some of which encroach very near to the stream <br />bank. A portion of the "River Pines" subdivision within the project area is currently <br />shown as being in the loo-year floodplain. Ten Mile Creek within the study reach was <br />once a braided stream which appears to have had multiple channels. One of the historic <br />stream channels is located within the River Pines subdivision. <br /> <br />A floodplain study for the town of Frisco was performed by Muller Engineering <br />Company under contract with FEMA. The revised FIS and FIRM (dated 11102/94) which <br />resulted from the Muller study shows the River Pines subdivision in an area of shallow <br />flooding for the 1oo-year event. The River Pines subdivision was not previously shown <br />as being within a flood hazard area on the original FIRM (dated 5/15/80). The reason for <br />the revised floodplain delineation is because of a substandard "levee" along the right bank <br />of Ten Mile Creek that was not approved by FEMA. The levee does not meet the <br />necessary design criteria and does not allow for 3 feet of freeboard. <br /> <br />. <br /> <br />During June of 1995, high water on Tenmile Creek resulted from snowmelt runoff from <br />the watershed. Snowpack in the watershed was particularly high due to significant <br />snowfall during April, May, and June of 1995. The peak flow in Tenmile Creek at Frisco <br />was estimated to be about 1800 cfs, which is approximately a 50-year flood flow. <br />Homeowners along Ten Mile Creek successfully sandbagged the right bank of the creek <br />to prevent flooding damage from the high water. <br /> <br />3 <br />