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7253 '~Y.o (,.$" '1.-0....t. is'-^'t-~ "'-1:, UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY MAP OF FLOOD-PRONE AREAS RALSTON BUTTES QUADRANGLE COLORADO-JEFFERSON CO 7.5 MINUTE SERIES (TOPOGRAPHIC) I 5"15' 39"52'30" " ~' \~\'v'v I;;~ ,=,.J ."'0\ ,yO 105"2230" 39"5230" '71 '78 '\ 18......, "- ".l ...........~ ,~' Roc k y '-. +;-'->;; ........, '" ...... F I a t 5 17 , ~ "'lj " o~ "> 8:: o~ " _0 >~ -. 0' 18 (. ;.J- 0. . ~~ ~ 740000 rEfT uti "11 " ;.- "II "II ./ , \ , ! " '.... "10 "10 . I ~ ; " , I, I, ~ ~v<<... MUl.eY ) 32 50 4409 T Z S. T 35 4408 \ \ J< "01 700000 '} FEET; . ~ \ , I 31/ ~S 469 2~~FEEl lO~n?'~(Y :\ Approximate boundaries of flood-prone areas are shown on this map. There is, on the r,':J average, about 1 chance in 100 that the designated areas will be inundated in any year. ~ q:~J This information is important to public agencies and private citizens concerned with future ,l " land developments. ~O.qo:'J The flood-prone areas have been delineated through use of readily available informa- \ tion on past floods rather than from detailed field surveys and inspections. In general, the delineated areas are for natural conditions and do not take into consideration the pos- sible effects of existing or proposed flood control structures except where those effects could be evaluated. Flood areas have been identified for: (1) urban. areas where the up- stream drainage basin exceeds 25 square miles, (2) rural areas in humid regions where the upstream drainage basin exceeds 100 square miles, (3) rural areas in se'miarid regions where the upstream drainage basin exceeds 250 square miles, and (4) smaller drainage basins, depending on topography and potential use of the flood plains. The 89th Congress, in House Document 465, recommended the preparation of flood.prone area maps to assist in minimizing flood losses by Quickly identifying t'he areas of potential flood hazards. More detailed flood information may be required for other purposes such as structural designs, economic studies, or formulation of land-use regulations. Such de- tailed information may be obtained from the U.S. Geological Survey, other Federal agencies, or State, local, and private agencies. "00 I ~ I 1 SCALE 1124000 o 39"45' GEO..OG'C;;..... .VIII"!'> "".......t~;T:~, DT~ COLO /19 05015' IDAHO SPRINGS /8 MI I 1 MILf EXPLANATION <;. ,-~O1:> 6''''... -?.... , "'0 -t.",--~ 1000 0 1000 2000 3000 4000 ~1:0;:1.. . I 5 0 ~ 0.---< ~ ~T-"'-=- 5000 6000 7000 FEEl , Flood boundaries were estimated from: Regional stage-frequency relations. 1 l'ilLOMETER CONTOUR INTERVAL 40 fEET DATUM 15 MEAN SEA UV[l Prepared by the U.S. Departme':lt of the Interior, Geological Survey, in cooperation with the U.S. Department of Housing and Urban Development, Federal Insurance Administration. G QUADRANGLE lOCA.TlON RALSTON BUTTES, COLO, N3945-W10515j75 Base by U.S. Geological Survey 1965 1973