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. 120 CONTRIBUTIONS TO HYDROLOGY Oll UNITED STATES, 1923-1924. from 300 second-feet on the 27th to 15,000 second-feet at 3 p, m. on the 28th. . After that it rose rapidly to the maximum of 95,000 second-feet at 8 p. m. on the 29th. It remained at crest stage for an hour and then fell slowly to 90,000 second-feet at 6 a. m, September 30. After that the. fall was more rapid, the discharge decreasing to 60,000 second-feet at 11 a. m.October 1 and to 32,000 second-feet at 6 p. m. the same day. By noon of October 2 the river was ~arly back to normal stage. The total discharge during the flood was estim~ted at 438,000 acre-feet, which is greater than the total yearly flow for each year but one in the.9ight preceding ye_arsJor_ which records are available. . ' An idea of the unprecedented discharge of the river during the flood is given by the following table, which shows the annual maxi- mum discharge for the years during which records are available: Annual ma:cimum discharge of Powder Ri~er at Arvada, Wyo., 1916-1923. , DIsch~ D"""";E' y,",- Date. (secou- y...., Da.te. (..... - teet). leet). - 19115..._____..._____ Jnne 29_____.______ ~080 1920..._____..______. JuneUL______.____ 1~700 1917_________________ May 22-...________ ..'''' 1921___.________.___ June3___un______ 6,680 1918_____...._______ JulYl4-______'_____ . '0.800 1922.._______________ Aug.3___nu______ 6,". 1919_______________ Aug.3..h____n___ "400 1923.______.________ Sept. 29____--.____ ...... NOTJ:.-From 1916 to 1918. JDclusiv8~ the station was maintained just above the mouth ot Clear Creek, 17mllesdowIlstream. .'. ' . The flood at Arva.da is an excellent example of the type of floods to which plains streams are subject and is in sharp contrast to floods on mountain' streams having steep elopes, an example of which is shown by the flood of June 3, 1921, on Arkansas River at'Pueblo, Colo. (See fig. 11.) The maximum stages were almost equal, b_ut the Arkansas rose and fell very rapidly, and the total discharge during the portion of the flood shown by the hydrograph in Figure 11 was less than 90,000 acr!l-feet. FLOODS AT SHERIDAN, WYO~ Sheridan lies just north of the Powder River basin at the con- fluence of Goose and Little Goose creeks. The storms' that caused the flood in Powder River were very severe near Sheridan and on the eastern slope of the Big Horn Mountains, a few miles distant, Goose and Little Goose creeks rose suddenly on the night of September 27.' Sheridan was flooded, 300 basements being filled with water, and scores of citizens were driven from their homes. Much of the wooden-block street paving was scattered or carried down Goose Creek. The total damage at Sheridan was estimated at $500,000.