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<br /> <br />"'-"7// <br />/ ) L/'\ <br />, - <br />, ( <br />r <br />J <br /> <br /> ! / " <br />""', " \ <br />, , , <br />0 . , , <br /> , '" <br /> , , <br /> , <br /> , , <br /> <br />j <br />I <br />,\ <br />, <br /> <br />~i~hin tne ~tudy ~eac~es, the La~e fork has an average gradient of 0.6% <br />and an dvera;e c~annel ~idth of 60 feet. Normal ~ater depths are 2.5 feet. <br />HensonCree"-,'"i"':hin ltsstudyreacn, has an avera;;e gradient cf l.2%,dverage <br />w;dth nf 50 fee: a~d average depth of 2 feet (during nor~al f10ws:. Stream <br />sub_itrate consists of large boulders, cobbles and bedrock. Streamside <br />vegetation consists of cottonwoods, willows and similar brush along botn <br />streams. <br />Obstructions to floodflows ~itnin the study reach include both natural <br />obstructionssuchaSvegetatiOngrowth,falJentrees, ice jams, etc. and <br />man_made obstructions such as bridges, buildings, fences and roadways. These <br />obstructions have a tendency to increase f100d elevations upstre am of the <br />obstructions and increase velocity downstream of the obstruction. <br />The stream valley abo~e the Lake Fork stUdy reach is essentially similar <br />to the study reach description (except it has a narrower flood plain). Lake <br />San Cristobal. a natural lake approximately 3.5 miles above Lake City,nasa <br />dampening effect on potential floods such as tnoseoccurring from high intensity, <br />short duration rainfall. For long duration spring snowmelt and combination <br />rainfall, however, the effect of the lake on peak floodflows is minimal_ <br />The stream valley above the Henson Creek study reach is very narrow and <br />steep. Trees and brush grow out over the cnannel in milny areas along this <br />tight valley. High waters could carry great amounts of debris through the <br />study reac~ J~d acce~tuate the flood elevations. <br />The historical use of the floodplain has been for range, wildlife and <br />resort activities. Land adjacent to the streams is pri~ately owned. These <br />areas have good plant cover and support meadow vegetation, willows and <br />cottonwood. Small areas within the floodplain are flooded annually and support <br />little or no vegetation. rhegroW'th of Lake City in rl'cent years has forced <br />greater development in the flood plain. With this increased encroachment of <br />d€,velopment In the 1'lood ploiin, the fl()w hazard t;; troc cc~~~~ity is incr<?d;"~ <br />and will continue in the future unless adequate measures are adopted to keep <br />the development outside the flood hazard areas. <br /> <br />I ' <br /> <br />, , <br />I , <br />, <br />, ! <br />, ! <br /> <br />P!..A,c1a <br />JF STUDY ~EACHES <br />Fork of Gunnison Ri~er <br />dnd Henson Creek <br />T. :., <br /> <br /> <br />9 <br /> <br />to <br />