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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF
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<br />FLOOD-PRONE AREAS
<br />
<br />BLACKTAIL MGUNTAIN QUADRANGLE
<br />COLORADO-ROUTT CO,
<br />7.5 MINUTE SERIES (TOPOGRAPHIC)
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<br />Approximate boundarie~ of flood. prone areas are shown on this map. There is, on the
<br />an'raKt', about 1 chance in 100 that the designated areas will bf' inundated in any year.
<br />This information i!-l important to public agencies and private citizens concerned with future
<br />land developments.
<br />Tht.' flood-prone areas ll<lY(' been delint'ated through llse of readily available informa-
<br />tion on past floods rather than from detailed field SlIl'H.'YS and in8pt'<.:tion~. In gen('ral.
<br />the delineated areas are for natural conditions and do not take into consideration the pos-
<br />sible effects of existing or proposed flood control structure!'; except ......hert. those effects
<br />could he (.valuated. Flood areas have been idtmtified for: (I) urban areas where the up-
<br />stream drainage basin exC'et>(ls 2S square miles. (:!) rural area8 in humid. regions where the
<br />upstream drainage basin exceeds 100 squart~ miles, (~n rural areas in semiarid r(>gions where
<br />the upstream drainage basin exceeds 2;)0 square miles. and (4) smaller drainage basins,
<br />dt'pending on topography and potential use of the flood plains.
<br />The 89th Congress, in House Document .tn.!), recommf'nded the preparation of flood-prone
<br />area maps to w~sist in minimizing flood losses by quickly identifying the areas of potential
<br />flood hazards. More detailed flood information may be reQllir~d for other purposes such
<br />aR strut'tural dt'sif{n!O, ('('onomic studieR. or formulation of land~ust' regulations. StICh de~
<br />tailt'd information may be obtainpd from the U.S. Geological Survey, other Federal agencies.
<br />or State, local, and private agencies.
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<br />EXPLANATION
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<br />Flood boundarie~ were estimated from;
<br />Regional stage-fn.oquency relations.
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<br />'A M Mt'AN SLA 1-
<br />This work was performed by the U.S. Geological Survey for
<br />and funded by the Federal Insurance Administration,
<br />Department of Housing and Urban Development. to meet
<br />provisions of the National Flood Insurance Act of 1968.
<br />
<br />r- CO.LOO'OO
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<br />BLACKTAIL MOUNTAIN. COLO.
<br />N4015-Wl0645/7 .5
<br />Base by U.S. Geological Survey
<br />1969
<br />
<br />QU.l.OPANGl( LOCATION
<br />
<br />1974.
<br />
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