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-10- The highlight of the construction yeaf was completion of Davis Dam and Power Plant, which started in January to feed electric energy into the Hoover-Parker net. The reservoir behind Davis Dam has been filled and the project is ready to provide watbr to meet requirements at the International Boundary in accordance with provisions of the Mexican Water Treaty. Essentially all construction on the western slope in connection with the Colorado-Big Thompson Project is complete or under contract. On the Provo River Project the Duchesne Tunnel i~ expected to be holed through about December 12. On the Paonia Project, thEj Fire Mountain Canal Enlarge- ment and Diversion Works are complete. Extension of the distribution system, construction of the Minnesota Unit, and provision of storage facil- ities are dependent upon reauthorization. After a landslide crushed the main t1lllnel in the Grand Valley project, the season's water supply was saved by driving a 2200 foot tunnel relocation through solid rock in 40 days. Th~ E.den Project saw completion this year of Big Sanely Dam, and only rehabili~ation of main canals and distribution works remains to be done. In the Lower Basin more than 600 miles of transmission facilities in connection with the parker-Davis-Hoover sY'stem were installed. On the Well ton-Mohawk Division, Gila Project, the pumping plants and main canal are planned for completion by June of next year, permitting irrigation of the first 10,000 acres in Fiscal Year 1953. Under the Colorado River Front Work i and Levee System, progress has been made in flood control, drainage andisediment control between Davis Dam and the International border. Lev\les have been built near Yuma and Needles. Ten million cubic yards of sand, silt and gravel have been removed from the bed of the Colorado and placed in levees. The total cost has been about $1,064,000, including overhead. Thirteen irrigation projects constr~cted by the Bureau of Reclama- tion were in operation during the year in th:e Colorado River Basin. The total area capable of being served with wat~r from those projects was over 1,250,000 acres '. Approximately 1,0801000 ac.'res within the Basin were irri. gated in 1950, Crop returns totaled ~155,oOO,OOO. Operation highlights of the year w~re completion and initial operation of the Mancos Project and the tur~ng over of the Valley Division, Yuma Project, to the water users. The turbine blades in the Parker Power Plant were redesigned to eliminate vibratio~. Water surges in the pressure distribution system of the CoachellaValley!Project were eliminated. On the Salt River Project, Arizona~ canals in permeable ground are being lined with concrete, The Salt Rijrer Project was one of the hardest hit of all Bureau projects by the drought of the past several years. The Bureau and the Geological Survey are collaborating with other Interior Department agencies in a report on this drought, among the worst in history.