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<br />UNITED STATES MAP OF FLOODJPRONE AREAS 7.5 MINUTE ~~~f~~A(~~POGRAPHrC) ",,,~~f'>O
<br />DEPARTMENT OF THE INTERIOR SWI< ELKHEAD CREEK ,.. OUADRANOLE ,
<br />107'22'30"
<br />GEOLOGICAL SURVEY '9 '98
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<br />4.564 IV NW HA YDEN 6 MI. '\ r
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<br />Approximate boundaries of flood-prone areas are shown on this map. There is, on the average,
<br />about 1 chance in 100 that the designated areas will be inundated in any year. This information is
<br />important to public agencies and private citizens concerned with future land development.q.
<br />The flood-prone areas have been delineated through use of readily available information on past
<br />floods rather than from detailed field surveys and inspections. In general, the delineated areas are
<br />for natural conditions and do not take into consideration the possible effects of existing or proposed
<br />flood control Structures except where those effects could be evaluated. Flood areas have been iden-
<br />tified for: (1) urban areas where the upstream drainage basin exceeds 25 square miles, (2) rural
<br />areas in humid regions where the upstream drainage basin exceeds 100 square miles. (3) rural areas
<br />in semiarid regions where the upstream drainage basin exceeds 250 square miles, and (4) smaller
<br />drainage basins, depending on topography and potential Use of the flood plains.
<br />The 89th Congress, in House Document 465, recommended the preparation of flood-prone area
<br />maps to assist in minimizing flood losses by quickly identifying the areas of potential flood hazards.
<br />More detailed flood information may be required for other purposes such as structural designs, eco-
<br />nomic studies, or formulation of land-use regulations. Such detailed information may he obtained
<br />from the U.S. Geological Survey. other Federal agencies,or State. local, and private agencies.
<br />
<br />SCALE ]:24000
<br />o
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<br />,
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<br />I MIL[
<br />
<br />EXPLANATION
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<br />'000 0
<br />.............. .........
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<br />'000
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<br />2000
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<br />3000
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<br />4(X1()
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<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations...
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<br />1 KllOM[lER
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<br />
<br />CONTOUR INTERVAL 40 FEET
<br />DOTTED LINES REPRESENT 20-FQOT CONTOURS
<br />DATUM IS MEAN SEA LEVEl
<br />
<br />.
<br />
<br />COLORADO
<br />
<br />RALPH WHITE LAKE, COLO.
<br />
<br />PREPARED BY THE U. S. GEOLOGICAL SURVEY
<br />
<br />QUADRANGLE LOCATiON
<br />
<br />1978
<br />
<br />N4030-WI0722.517.5
<br />Base by U.S. Geological Survey
<br />1971
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