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SOIL conSERVATION S:rnVICE ACTIVITI3S(CONTlD.) is not as yet oompleted, cut are not advised as to when its oompletion may be expeoted. Considerable work has been done in Colorado by the Forest Servioe, Rooky Mountain Forest and Range Experiment Station, Soil Con- servation Servioe. and related agenoies, upon questions including rain- fall- infiltration - runoff relations, the results of which should be applioable to the problems of flood prevention. and seem needful in rational designs of flood oontrol work. In oertain portions of the Cherry Creek water shed, the Soil Conservation Service has oonstructed soil-erosion and water runoff ret~rdation devioes and struotures, said to oover an area of 25.000 aores. Civilian Conservation Corps is said to have oompleted the treat- ment of an additional 10,000 aores. Together these treated areas repre- sent l3-peroent of the entire Cherry Creek watershed. or 25-peroent of the area between Castlevrood Dam and Sullivan Barrier in whioh the eX"Perimental and demonstration projeots mainly are looated. Most of this work has been done on the east side of the Cherry Creek Valley, but a few small oheok d8lllS have al so been construoted to the west on the high divide between the watersheds of Cherry Creek and Plum Creek. These measures appear to be effeotive in reduoing the quantities of s oil, silt and sand oarried into the streB" ohannels, and to be of value in preserving the watershed or some portions thereof. against the destruotive effeots of sheet and gully erosion. at least to the extent that they have funotioned and been tested by rainstorms sinoe their con- struction. The ultimate effeot of suoh treatment, in reduoing sedimentation, in preserving the useful life of major, main-stream reservoirs and barriers, -7"