IRRIGATION AND HYDRO-ELECTRIC DEVELOPMENTS 

 interception of inflow, some of the marsh lands 

 around Tule and Lower Klamath lakes. The growth 

 of Klamath Falls, stimulated by the improved use 

 of the lands in the surrounding country, speaks 

 for itself. 



Klamath Falls, population about 3000. 



Sources of water: Upper Klamath Lake and 

 Clear Lake. Upper Klamath Lake, area 60,000 acres, 

 storage about 200,000 acre feet. Clear Lake, area 

 25,000 acres, capacity 462,000 acre feet. The dam 

 at Clear Lake has a height of 33 feet, is 790 feet 

 long and is built of earth and rock aggregating 

 46,600 cubic yards in volume. A notable structure 

 is the diversion dam on Lost River. It is con- 

 structed hollow of reinforced concrete. Its maxi- 

 mum height is 40 feet. The length of masonry is 

 290 feet, the length of earth fill 385 feet. It con- 

 tains 5550 cubic yards of concrete and 13,100 cubic 

 yards of earth fill. The tunnel through which 

 water is drawn from Upper Klamath Lake is 3300 

 feet long. 



The irrigable area of the first unit of the pro- 

 ject is 30,000 acres; the reclamation of Tule Lake 

 will add 35,000, and the entire project area is 72,000 

 acres. The irrigable lands opened exceed 30,000 

 acres, nearly all in private ownership. Upwards 

 of $2,000,000 have been expended on this project. 



The Yakima Project and the Okanogan Project, 

 Washington. In Washington the United States 

 Reclamation Service has invested in the Yakima 

 project about $6,000,000, and in the Okanogan, 

 about $600,000. Space will not permit inclusion of 

 a description of these works nor of others on the 

 Pacific Slope. Nevertheless, they will repay a visit. 



SAN JOAQUIN VALLEY IRRIGATION DEVELOPMENTS: 

 The irrigation development on the Kern and the Kings 

 rivers, typical of that on other streams in the 

 southern San Joaquin Valley, California, is a spe- 

 cial credit to the engineers who directed the early 

 enterprises. Here irrigation commenced half a 

 century ago, at a time when the products of the 

 soil were not as valuable as at present and when 

 to make a success of irrigation the cost had to be 

 kept down. Massive masonry structures were out 

 of the question. Weirs and dams were constructed 

 of brush, cobbles, and wood, and though of only 

 limited life, admirably served their purpose and 

 the foundation was laid for prosperous develop- 

 ment under irrigation, which has gradually ex- 

 tended from the region of least rain northerly 

 until now all east-side streams of the San Joaquin 

 Valley are under draft for irrigation water. The 



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