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. ( . Animas the overflow reached First Street which wss not as severe as the 1921 flood when it was 4 feet deep at that lo- cation. Below the mouth of the Purgatoire River, the flow was estimated at about 25,000 c.f .s. . 20. FLOOD OF 1904. A storm occurrin~ during the period September 27 to October 1 caused severe flooding on the Purga- toire River at Trinidad and in the valley in both directions from that city. The storm originated mostly on the Purgatoire River watershed with heavy concentrations at and above Trinidad. The flood was the largest of record in that vicinity. Tribu- taries other than the Purgatoire River contributed to heavy flow in the Arkansas River where the peak flow st Lamar was estimated at 65,000 to 70,000 c.f.s. I ,. I. 21. FLOOD OF 1906. Heavy concentrations of storms in the Big Sandy Creek area during the period October 17-19 extended to the Purgatoire River and the Arkansas River between Las Animas and Lamar. There was no flood at Pueblo, but below the mouth of the Purgatoire River the peak flow was estimated at 80,000 c.f.s. . (" 22. FLOOD OF 1921. On June 1 a cold front passed over Colorado and by early morning on June 2 a high pressure area, centering over northern Canada, extended entirely over the state. By June 3, a weak, low-pressure area had formed over southern Arizona and northwestern Mexico. Strong anticyclonic circulation brought relatively moist, possible modified con- tinental air into Colorado. Orographic action was pronounced and heavy precipitation occurred along the fronts. Two areas of intense rainfall were observed above Pueblo. One of these was mostly north of the towns of Florence and Canon City. The other fairly well distributed on both banks of the Arkansas River between Portland and Pueblo. Precipitation in this latter area is reported to have been as much as 11 inches in 6 hours while in the other area it was reported to have been as much as 9 inches in 6 hours. The rainfall in the upper area was re- ported to have occurred first so that runoff combined with that below produced the largest flood of record at Pueblo. The main center of the storm was on Dry Creek and there were heavy rains at Pueblo and on tributary areas eaat of Pueblo. Areas in Huerfano and Purgatoire Rivers and in Timpas, Adobe, and Horse Creeks were flooded by runoff from heavy precipitation. Heavy rains occurred on the main stem of the Arkansas River from La Junta to Lamar. Four peaks were observed at Pueblo during this flood. The first occurred about 2 a.m. on June 3. The .second, and largest, occurred at midnight on June 3,and two smaller peaks were observed on June 5. The peak discharge at 2 a.m. on June 3 was about 28,000 c.Ls., and that at midnight waa 103,000 I. I . . I. 7 .