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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />because of the high velocity flows. <br /> <br />The flood of September, 1970 atU?per Vallacito Creek was <br />caused by an extremely heavy rainfall of 4-1/2 inches in a 6-12 <br />hour period. Many vehicles, homes and trailers were damaged or <br />destroyed. The total cost of the flood loss exceeded $60,000. <br />Major flooding occurred throughout the Animas, Florida, and Los <br />Pinos valleys in October, 1911 and July, 1927. The October, 1911 <br />flood was the worst flood on record for the San Juan Drainage Basin. <br /> <br />3. Archuleta County <br /> <br /> <br />Major flooding along the San Juan River through PagosaSprings has <br /> <br />occurred during the fall of the year and is attributed to rain- <br /> <br />storms of long duration. Minor flooding in the spring, at more <br /> <br />frequent intervals, is caused by rapid snow melting during abnor~ <br /> <br />mally warm weather. Localized cloudbursts during the summer months <br /> <br />have caused periodical flooding of small streams around and in pagosa <br /> <br />Springs, and along the Rio Blanco River in the Archuleta County. <br /> <br />The October 4, 1911 flood of the San Juan River Basin is the most <br /> <br /> <br />severe on record. A steady 24 hour rainfall on already saturated <br /> <br />soils caused the San Juan River to rise to a flood stage of 17.8 <br /> <br />feet in Pagosa Springs. Damage was sever~ totaling approximately <br /> <br />$1,000,000. Two lives were lost during the flood. Both highway <br /> <br />bridges were lost as well as the power and light company and munici- <br /> <br />pal water plant. Many homes were washed from their foundations . . <br /> <br />The railroad to pagosa Junction was severely damaged with hundreds <br /> <br />of feet of track washed away. Other flooding in Archuleta County <br /> <br />-10- <br />