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. SOME FLOODS IN THE ROCKY MOUNTAIN REGION, 117 . The chief difference in the two floods was that the July flood was . caused by heavy rains of almost cloudburst intensity over a com- paratively small area that centered chiefly over Badwater Creek, with little inflow below Thermopolis; and the September flood was caused by general rains of less intensity over the entire drainage bil.Sin, with considerable inflow below Thermopolis, .An idea of the relative si~e of the floods of 1923 on Big Horn River at Thermopolis as compared with the maximum discharge each year for which records are available is given by the following table: Annual'marimum discharge .01 Big Horn RiVeT at Thermopolia, Wyo., 1900-1929. . Dlscb~e D"clwge y"". Date. . ('eeo Year. Date. (second- . feet). feet). 1900______._.___...__ June 8_______._.~__ 1~600 1915._.".___...._____ June3__.n____n__ 11,800 1901._n____________ May 22.___..._.__ 17,500 1916__________._____ 21n.n.__n__ 13,000 1902.________________ June 12..._.d._____ ','" 1917.________.______ 24. Zl._nu__ 19,400 1I103._n______.u.___ 19.__________ 10.100 1918______n"________ , 17._____n____ 19,200 1904..._______________ 22...__________ 1~600 1919._______________ 1nn_.n.___ 6,000 UI05._______________ 8.8.n_n_n 1~600 HnO______.~_______. 14._.._._____ 13.800 1911_n.._n__..__n. 19....._._~__ ",000 1921____~n_.__..n_ 10____nn.__ 20,800 1912______n__n____. IL..___n__n 19,500 1922_____n:.~..nn_ lL_n_....___ 12, 100 1913_~________~n.___ MBy3L___nn.___ 17,700 1923_ __~.._____nn~_ July 2Ln_~____~_ 20,800 1914___._____________ June ',___m.,... 12.800; 1923__n_______~____ Sept. 29"_____..n 23, 500 NOTZ.-M&.rlmum discharge for extreme stag9 recorded eJ:cept for 1902 and 1911-1914, when it is for tbe ~hal1r period. FLOOD ON POwDER RIVER, WYO. GENERAL FEATURES. The general rains which caused the September flood On Big Horn River covered the entire drainage basin of Powder River and extended north into Montana. The flood on Powder River was the largest that has occurred in the 40 years that white settlers have lived in the valley, The following table shows all available rainfall records at Weather Bureau stations in the Powder River b~: Rainfall in Powder River ba8in~ "o/'yo., Sept. S0-80, 19113, in inches. , Station. 28 %1 28 .. 80 TotnJ.. . 1.20 ~%1 ~13 :~o;~-.:-::::::::::::::::::::::::::::::::::::::::: ___n_.._ U7 U7 .23 1.88 1_%1 ," '75 Barnum..__ __..._.n__.....n_______.._...~_..__n.._______ ------.- ,81 1.7.5 ... ,15 .75 Ninemile Creek ._..___n____........____n_______..___.. ...~._....- .70 L23 nn:6i" uo US Buffalo____n__.____n...________n_...._..___.___n____ n____.. L<6 Ul .1' 8." Glllette__.:__~._.n_._..___-_____......_n_______________ T,_ 812 ... ... 848 Echeta____.__.___.:.____._.._______~~..l_....._.._.._______ ... .20 1-35 1.10 U. Cl.earmont ._ _____.._.._~_______..._..._.______..___._....... .------- LOO 1,00 LOO .23 ~15 Sheridan .___n_.__..._______~...._____n_____.:.___........__ -------. ... .23 ... ,94 a17 Sheridan fleld station o_.~.. ._.._nn_......_._...........____ ...._n.. ." '20 L" L51 5.89 .Verona On____....___n__........____n._..__..____...______ L20 1.50 1," L" ,28 ... Hunters station___._...._..:-n__--......-.------n---n--- ,09 L80 1.07 .00 ,70 U6 o Precipitation measured in morning for 24-hour period ending at that tim. e" . PrecIpitation recorded on Sept. 30 is accumulation for two days.. . Regular Weather Bureau stat1on; precipitation for 24-hour period ending at midnight. NOTB.-Except as otherwise indicated, observations are made late in the afternoon, noor sunset, and precipitatIon is recorded for 24-hour period ending at that time.