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The Gibson Dam storm of 1964 and the Cherry Creek storm of 1935 are important general storm events and have been cited in several PMP studies for basins north of Palmer Divide. Figure 2 shows the transposition limits for both storms in the HMR 55A region. Mason Reservoir is located just outside the extreme southern edge of the Gibson Dam and just west of the Cherry Creek storm transposition envelopes. HMS thoroughly reviewed the meteorology and orographic effects of these storms and compared them to the Mason Reservoir site. The upslope components of the topography opposite the heaviest rainfall centers produced were quite different than the slopes defining the Mason Reservoir site. HMS agrees with the opinion given in HMR 55A that both storms are just outside the transposition limits for the Mason Reservoir PMP. However, HMS transposed these events to the Mason Reservoir Basin in order to compare their maximized and transposed precipitation values with those given in other PMP studies for high elevation sites in the State of Colorado, Figure 2 ~ransposition limits for Gibson Dam, MT storm (75) of June 6-8, 1964. __. I 13 10~~ 105 "~ r;~tL)dJ I ~1~~r:Jg~~~ l--r 45 trl I l~ y, I I, I r---+~ .------ f 'I i .-.J._ . f-+-.l "If I I L 3 -J I' I ,-__ .-1-14/ I " . 1-1; I LJ -" c-.L L~ .~.::.: . 'i]' \\ I "" ~ '~I I ~~ Si j~._ I \"... .1/, 109 105 101 101 - I 'Y I I I ... I I I I i 1- , I I '.-'.,---:- , I I I _L I 4 I '-'-. J I 4 ! ~+- I I I - I 37 _.n_.._.--, I ' I I l 33 . , i i -",,/ ), 29 . 9 5 8