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<br />REPORT OF THE FLOOD OF JUNE'l964
<br />IN THE, UPPER, MISSOUR~, RIV~ Bi\,SI1tINMqIfTANA
<br />
<br />,,'., ,'I;" INTRbDUC~ION
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<br />1. GENERAL
<br />
<br />J. .. _'_' . " .'.
<br />During the period 7-13 .tune, 1.964, nc:irthwl:!st~rn,l<lontariE\,in~l~ing
<br />the ar~asbotheast arid west of, t)le ContinertaLDivid~ ,experienced the
<br />worst natural disast,er Jtithe' state' s:history., Heavy ,ra,int'all centered
<br />near the CG~tinental D;i.v~de coiiP-1-ed with hi~\!lp.OwmE!l~ runoff caUsed
<br />unprecedented nooding. in the, sun: and Marias ,RiVer basins along, with
<br />moderate flooding in; other areas of tlie~Upper Missouri River Basin.
<br />Loss ot' human lit'e was extensive, particularly i,n the flood plain, areas
<br />located dOWllstream t'rom two private dalDS which failed, Swift Dam on
<br />Birch Creek and ,Lower'J;'wo r.redicire,Dam on Two.r.redicine' Creek. Property
<br />, damage' was heaVy "a.Ddexceelie11,anything'experie~c,edthus 't'ar.' This
<br />report presents'the caU!le andeffect'ot'"the'i'lood and includes a
<br />description 01' theares.,avai1ab1e hydr01ogi.c...and.:hydraulic dat,a,
<br />estimates 01' areas flooded, and ~he, extent, and type of damages sustained.
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<br />2. AUTHORITY
<br />
<br />The post flood investigation and ,report were authorized by the Chief
<br />of Engineers on ,ll) June 1964.
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<br />3. PlJRPOSE
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<br />., ,---
<br />This, repott' is limitedto,a descriptionoi the antecedent flood
<br />conditi\)ns, tile' storm event . resUlt~t nooding; and o.8lDSges sustained
<br />throUghout the general area. 'Various :types', Qt, basic ds.tapertinent to
<br />'future river basin' studie's were compiled, but-anaiysis'thereot' was not
<br />made for this rePort. AccordingiY, tlfereport provi~a'pertinent data
<br />sOjU"ce for Governmeptai agencit;!s ,pl.i\;llic officiais, and local interests.
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<br />4. 'stOPE
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<br />'. ., .".: . 1
<br />The~tagathereq.-' is ,of ,suf',ficient, s90pe to dete:r!lline accurately
<br />the intensity"atrd range of ,tl!e-eausa1;ive-storm ~d,resultant: flood
<br />are-s;s, stages,' ,,'ami fl!,odet'fects; , 'Fie,lli 'survE!y'l!"-during ,arid fpllOWing
<br />, the flood -wenr' :madetoestabli'sh ,the charactEiTisti,cs'o-f the-storm, to
<br />gather additi'ons.l 'rainfall' 1lJIIOt1Irt;s'to' supp:1.ement' avsiiableU; S. Weather
<br />'Bureau"data-.-' to' record high- wa'ter'marks"as a'means for establishing
<br />flood' profiles" to determine the extent and' nature of'flocrded areas,
<br />and the' compilation of sufficient data 'in order to 'evaluate flood
<br />damages'. Slope..area sections'havebeen'established--by the' U. S.
<br />Geological Survey for computation of t'lood'uischarges Vy indirect
<br />means since discharge measurements 'could 'not 'be 'obtained 'during the
<br />flood.
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