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. 118 CONTRIBUTIONS TO HYDROLOGY OF UNITED STATES, 1923-1924. Roughly approximate records were also obtained at other points. B. F, Horton, who lives 472 miles northeast of Arvada, measured 872 . inches of rainfall from September 20 to 30 in a coffee can in Ills yard. William La Follett; who lives in sec. 23, T. 45 N" R. 87 W., had a water tank 3 by 8 by 272 feet deep in an exposed position. The rain began at 4 a. m, September 27, and by 4 p. m. on the 29th the tank contained 5 inches of water; two days later this had increased to 6 inches, A rancher near Savageton, in T. 45 N.; R. 76 W" stated that a 14-quart water pail with nearly vertical sides, which stood in an exposed place, was filled twice in. 48 hours, indicating an .almost unbelievable rainfall of 17 inches. At Ross, just east of the Powder -River basin, in T. 40 N., R. 75 W" no records were kept, but the postmaster stated that the raiDfall was the heaviest in years. .AJ< much of the basin is very sparsely settled, it is possible that heavy rainfall occurred at other points and was.not recorded. The available data show that the rainfall over practically the entire drainage basin was at least 4 inches and that in some small areas it was considerably greater. The Hood was severe tbroughou t the valley, and channels were changed and rechanged by it. All residents in the valley were forced to abandon their home~ temporarily, as the water was from 10 to 12 feet deep in the river bottom above the main channel. Houses were destroyed, practically all hay was washed away, and whole Hocks of sheep, as well as much other livestock, were. swept away. At Arvada the Chicago, Burlington & Quincy Railroad's 270-foot steel-girder bridge of five spans resting on large concrete piers was destroyed. The first pier began to' settle during- the afternoon of September 29, and by the next morning the entire bridge was gone, the piers having been undermined and overthrown. About 300 feet. of !Ugh railroad fill at the north end of the bridge was also washed out. PROGRESS OF FLOOD, Records of Salt Creek, taken by the Midwest Refining Co. below Salt Creek reservoir, in sec. 36, T. 41 N" R. 79 W; (drainage area 520 square miles), show that the creek rose .from 1 second-foot about 4 p. m. September 27 to 32,000 second-feet" at 2,30 a. m, September 28 and fell to 1,000 second-feet at 3 p. m. September 29. By October 8 the discharge had fallen to 10 second-feet. The crest of the Hood on Powder River occurred at Arvada at 8 p. m. Septem- - ber 29, 30 hours later than at the reservoir, and as Arvad.. is 145 miles distant by river the crest traversed this distance at an average rate of 4,8 miles an hour. Usually a flood crest flattens out as it , Slope measurement from high-water marks aDd area of ClOS8 section checked by ~mputation of flow through contracted openings.