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<br />UNITED STATES
<br />DEP ARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF
<br />
<br />FLOOD-PRONE
<br />
<br />AREAS
<br />
<br />JOHNSTOWN QUADRANGLE
<br />COLORADO
<br />7.5 MINUTE SERIES (TOPOGRAPHIC)
<br />
<br />\ 5064 IV NW
<br />40'22'3b9,5'00' I 'OI.....E. '02 '03 , 57'30' R. 68 W. '04 'll5 rWINDSOR, R 61 W '06 I '07 55' 508 2170000 FUT, '10 104'52'}8:22'30''
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<br />
<br />40015' 5()1:) MI. TO COLO_ 66 2150000 fEET I 57'30" 5(}4 R. 66 VI: 505 (GOWANDA) R. 67 W 506 r 507 55' 508. lNTERIOIll Gl!:OLOG1CAI.. 5UIllVEY~W"6H.NOTON. 0 C SI()OOOm-[ 104052' 30"
<br />1050 OENVER IJNIE.RSTAT!: 10J;:; MI 5064 fit NW
<br />
<br />"68
<br />
<br />68
<br />
<br /><'
<br /><'
<br />..o",~
<br />JoG"
<br />O'...bVl
<br />I.Y VI<r
<br />
<br />Approximate boundaries of flood-prone areal:! are shown on this map. There is, on the
<br />average, about 1 chance in 100 that the designated areas will be inundated in any year.
<br />This information is important to public a~encies and private citizens concerned with future
<br />lana dew'lopments.
<br />The flood-prone areas ha\-e heen delineate<l through use of readily available informa-
<br />tion on past floods rather than from detailed field surveys and inspections. In general,
<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 structures except \',-ht're those effects
<br />could be evaluated_ Flood areas have been identified for: (1) urban areas where the up-
<br />st.rpam drainage basin exceeds 25 RQuare milt.s, (2) rural areas in humid regions where the
<br />upstream drainage basin exceeds 100 square miles, (3) rural areas in semiarid reg-ions where
<br />the upstream drainagt' basin exceeds 250 square miles. and (4) smaller drainage hasin...;;,
<br />depending on topography and potential use of the flood plains_
<br />The 89th Congress. in House Document 46.'), recommended the preparation of flood-prone
<br />art'a maps to assiRt in minimizing flood losses by quickly identifying the areas of potential
<br />flood hazards. l\lore detailed flood information may be required for other purposes such
<br />as ~tru('tural designs, economic studiefl, or formulation of land-use reguJationB. Such de*
<br />tailed information may be obtained from the U.S. Geological Surv('y, other Federal ag~mcies,
<br />or State. local, and private agencies_
<br />
<br />""
<br /><
<br />..s-%."'",
<br />':::-~L.
<br />~1.-;'<t:~
<br />~
<br />
<br />SCALE 124000
<br />
<br />! 0
<br />-
<br />
<br />1 MilE
<br />-------~
<br />
<br />EXPLANATION
<br />
<br />I
<br />~-
<br />
<br />Flood boundarielol were estimated from:
<br />Regional stage-frequency relationI'!.
<br />
<br />1 ()(X) 0 10Cl0 2000' 3000 4000 5000 6000
<br />~ ...
<br />
<br />7000 FEET
<br />,
<br />
<br />1 5 0
<br />~........... 0-----0......................
<br />
<br />1 KILOMETER
<br />
<br />EJ
<br />
<br />CONTOUR INTERVAL 10 FEET
<br />DATUM IS 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 />JOHNSTOWN, COLO.
<br />N4015-Wl0452.5/7.5
<br />Base by U.S. Geological Survey
<br />1950
<br />PHOTOR,EVISED 1?69
<br />
<br />QUADRANGLE LoCATION
<br />
<br />1974
<br />
<br />7277
<br />
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<br />.
<br />
<br />.
<br />
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