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~ ~ water supply resulted in slight reV1s~ons in power operntion studies. Suoh revised studies were pbrtially completed. Chunges in hydrolocic studies nnd powor studies noted above were incorporated into the substQntiating report. Considerable pro- gress '''''-6 ",:.de in preparf\tion of report '2,pper,dices. Cross iJount:tin Unit. Colorado Tho ~nit0-Yllmpll Diversion topogr&phy maps were prepared. Revi sions were made to modified hi stori onl flow computnti OIlS and to esti~ted ultimute flow. Minor revisions to power studies were m~de due to changes in estimated water supply. Glen Canyoll Unit, 'Arizon!1-Utah The estimated virgin runoff of the Colorado River at Lees Ferry was revised to conform with comments by the Chief, Hydrology Division. Corresponding revisions were also made to modified historical flow ccmputations and to ultimate flows previously computed. Revisions to power studies m~de necessary by revi- sions to computed water supply were c"lcul(lted. h.yout schedules for the 'Glen Canyon Unit in conjuncti on wi th othar upper bc,sin ~ower sites were computed. Coloredo River Above Grund Juncticn, Color"do All work under Engineering Plan, Designs and Estimotes progressed uniformly during tire month. Work on the !louring Fork Hiver wos not on schedule dUG to the injection of ~dditionol problems of wuter supply und requirements for industriul uses. Extensive areus south of the Color~do River betweetl GlenvlOod Springs und DeBeque h9ve bean inoludo;! und m"y be affecte;! by the Roaring Fork studies. Smith Fork Project, Colorado The processing of field date on the Smith Fork Feeder and Aspen cutl(ds Wo.$ continued and studies of !llternlltivc routes oOl'lplcted on the first four miles of the Aspen C"m<l', by the area office. Prdininc.ry designs end estilMtes are 15 perCEJ/lt complete on each canal. Pr~limin"ry designs and estimntes on Gruwford Dum Ure being prepured by the Regional Offie,e. Advunce discharge racords on Iron Creek ('nd Smith "ark River were received during the month l'\uking it possible to continue .."ter supply studies at a more r~pid rote. Consumptive use. water requirement, and operation studies were Hlso advanced. Economic studies were somewhat ret~rded during the month becaus~ of delays in the hydrologic sUldies. Work was continued on studies of the present and anticipdted economy on the project. A rough dr~ft of the Land Resources Appendix hes boen prepared. ~ u> o Gunnison River Project, Colorado ReconnaissQnce geological inspection w~s made of tho Ridgeway Damsite on the Uncompahgre River by the Regional Geologist. Le.nd classification 2