EECLAMATION OF ARID LANDS — BEADLE. 487 



acres, making it desirable to build a pumping plant that has been 

 regarded as a part of the general plan, and this has recently been 

 constructed. Small hydroelectric plants have been erected at drops 

 formerly provided in the project canals and the power thus de- 

 veloped is used to operate the pumping plant, which is located near 

 Omak. This lifts water from the Okanogan River to supplement 

 the supply from the Salmon. It is not necessary to run the pumps 

 every year, but they provide capacity to water about 1,000 acres 

 during seasons of lean runoff in Salmon River. 



The project lands are excellently suited to the production of fruit, 

 particularly apples. Peaches, apricots, pears, prunes, and various 

 small fruits are also grown. Hay, forage, and vegetables are pro- 

 duced on smaller areas. 



YAKIMA PROJECT, WASHINGTON. 



As described in former reports considerable work has been com- 

 pleted toward the execution of a comprehensive development of the 

 Yakima Valley, including storage reservoirs at the headwaters of 

 the Yakima River and its tributaries, and distributing systems at 

 various points lower down in the valley. Since former statements a 

 permanent dam has been built at the outlet of Kachess Lake and 

 a similar structure is under way at Lake Keechelus. Kachess Dam 

 is an earth and gravel fill 1,400 feet long and 65 feet in maximum 

 height. On the Tieton River a relatively small reservoir has been 

 formed by the construction of Clear Creek Dam (pi. 12, fig. 1) to 

 serve a novel purpose. The Tieton is fed by melting snow, causing 

 a large diurnal variation in the floAV so that the discharge at its peaks 

 could not be taken into the main canal and some of the needed 

 water was lost. The Clear Creek Dam provides the necessary reser- 

 voir capacity to correct this daily fluctuation and store a small 

 quantity of water. 



The principal distribution systems are the Sunnyside and Tieton 

 units. In 1906 the United States purchased the old Sunnyside Canal, 

 then watering 40,000 acres, and this has been extended and enlarged 

 to supply 82,000 acres, including several small tracts to which water 

 is pumped, using power developed at plants built at drops in the canal 

 s^^stem. On the Tieton water is provided for 33,000 acres by a sys- 

 tem including a main canal of difficult construction through Tieton 

 Canyon, involving several tunnels and long stretches of open canal 

 made up of concrete shapes. 



Nearly 100,000 acres are now under irrigation on these two units, 

 growing crops each jear worth three to three and a half million 

 dollars. The section has become a well-known apple producer and 

 through cooperative organizations has made great progress in de- 



