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<br />of obtaining slope-area measurements throughout the area. This eff'ort <br />in~ludes the making of .indire~t determinations of' peak dis~harge at all <br />of its re~lar gaging stations and also at numerous other 10~ations <br />throughout the affected area.. The Corps of Engineers established about <br />125 high water m!lrks along :many of the flood-affe~ted streams in order to <br />establish high water profiles. <br /> <br />b. There has not been suffi~ient time to analyze the volume of' <br />data that was~olle~ted in the post-flood effort ~ The U. S. Geologi~al <br />Survey has a spe~ia1 unit in its Helena, Montana, office that is <br />presently engaged in the analysis of' the data ~ollected in the field. <br />The results of these stuliies. are not available ex~ept for some preliminary <br />information on tributary streams. Availab;J.e data are summarized in <br />tables 2 and 3. The limited ~amparisons in these tables illustrate the <br />relative magnitude of' the 1964 event. <br /> <br />TABLE 2 <br />REPRESEN'rATIVE PROVISIONAL COMPARISONS OF JUNE 1964 FlOOD <br /> <br /> Drainage Previous Re~ord June 1964 <br /> Area Period of Stage Dis~harge StageDis~harge <br />Stream Sg .M:!.. Re~ord (Feet) ( cfs) (Feet) ( ~fs) <br />Sun R; nr. Vaughn 1854 1934- 16.38 17,900 23.4 53,500 <br />Two Medi~ine Cr nr.Browning 317 1907-24,1951- 8.6 7,950 14.0 100,000 <br />Badger Cr nr Browning 133 1951- 6.28 4,220. 10.37 49,700 <br />Cut Bank Cr at Cut Bank 1065 1905-24,1951- 11.04 10,400 14.2 16,600 <br />Dearborn R. nr Craig 325 1945- 9.58 7,960 13.5 15,400 <br />Teton R. nr Dutton 1308 1954- 5.96 1,310 19.8 71,300 <br />~ Marias R. nr Shelby '-~ 1911- 17.75 40,000 23.64 241,000 <br />Bir~h Cr nr Dupuyer 105 1907-37 NA NA NA 881,000" <br /> <br />c. It is believed that other tributarY streams in the area affe~ted <br />by the storm, parti~ularly those lying west of tJ?.e Missouri River, will <br />~ompare with past o~curren~es in a manner similar to those given in table 2. <br />In addition to the above values, preliminary estimates are available of <br />inf'low"'outflow hydrographs for Ca\'lyon Ferry, Gibson, -ana: fiber Reservoirs. <br />These hydrographs, furnished by the Bu.reau of Re~lamation, are presented <br />on plates 2, 3, and 4, respe~tively. <br /> <br />d. The record tributary discharges resulted in extremely high flows <br />on the main stem of the Missouri River in the reach fram Canyon Ferry to <br />the upper end of the Fort Pe~k Reservoir. The preliminary peak values <br />estimated for the 1964 event at several of the main stem stations are <br />shown in table 3 and ~ampared to peaks for the 1908 and 1953 floods. <br />It should be noted that the 1964 peak values at Virgelle and Zortman were <br />lowered appre~iably by the operation of Tiber Reservoir. <br /> <br />8 <br />