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<br />'<>0",- DEPARTMENT OF THE INTERIOR MAP OF FLOOD-PRONE AREAS ILIFF QUADRANGLE
<br />1". GEOLOGICAL SURVEY COLORAOO-LOGAN co.
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<br />4O";iJ300T30" R. 52 W. I .1 II MIrO U 50'S R 51 W 5' 12 6)!~E~~;~a " M' ISALlENI 1 2'30' ,""..o,_o,ocoo.m ."..n ..."'....0" 103~45'
<br />Approximate boundarieg of flood. prone areal'! are shown on thiR map. There h~. on dw FT MORGAN 5~ /WI SCALE 1: 24000
<br />averugt", about 1 chance in 100 that the designated arl~as will be inundated in any year.
<br />ThiH information is important to public agencies and private citizens concerned with future
<br />land developm('ntR.
<br />The flood-prone areas have been delineated through use of readily available informa-
<br />tion on past floods rath('r than from detail(>d field surveys and inspections. In general,
<br />the delineated areas are for natural conditions and do not take into consideration the POS*
<br />sihle effects of t'xisting- or proposed flood control structures except where those effects
<br />could be evaluated. Flood areas have heen identified for: (1) urban areas whf~re the up-
<br />stream drainal{e basin eX('f;'eds 25 square miles. (2) rural areas in humid regions wht"re th('
<br />upstrt'am drainal{e basin exc(,f;'ds IOn square miles, (3) rural areas in gemiarid regions where
<br />the upstream drainag-e basin exceeds 2.'50 square miles, and (4) smaller drainage basins.
<br />dep(.nding on topography and potential use of the flood plains.
<br />The 89th Congress. in House Document 46.5. recommended the preparation of flood*prone
<br />arf;'a maps to assist in minimizing flood losses by quickly identifying the areas of potential
<br />flood hazarns. More detailed flood information may be required for other purpv~es such
<br />as structural designs. economic studies. or formulation of land~use r",gulation~. Such de-
<br />tailed information may be obtained from the U.S. Geological Survey, other Federal agencies,
<br />or State. local. and private agencies.
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<br />EXPLANATION
<br />
<br />1000 0
<br />~.;::;r-.-=r
<br />
<br />1000 2000 3<XXJ 4(x)o 5000
<br />>--._ ,--------0 -
<br />
<br />6000 7000 FEET
<br />,
<br />
<br />Flood boundaries were estimated from:
<br />Regional stage-frequfmcy relations.
<br />
<br />I 5 0 1 K1LOMETER
<br />~... >-__... r~"'" ~ --,-....::=~
<br />
<br />.
<br />
<br />CONTOUR INTERVAL 10 FEET
<br />DATUM 1$ MEAN SEA LEVEL
<br />This work was performed by the U.S. Geologica! 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 />COLORADO
<br />
<br />QUADRANGLE LOCATION
<br />
<br />ILIFF, COLO.
<br />N4045-W10300/7.5
<br />Base by U.S. Geological Survey
<br />1951
<br />
<br />1974
<br />
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