J 38 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 



into Little Klamath Lake (Oregon-California) ; thence south- 

 westward through Siskiyou, Humboldt and Del Norte coun- 

 ties, California, to the Pacific Ocean. Irrigation is here essen- 

 tial. The lands are flat, the soil fertile, sandy loam, probably 

 capable of economical irrigation. Estimated area to be brought 

 under water, 140,000 acres from Klamath River and 72,000 

 acres from additional reservoirs, besides about 100,000 acres 

 in Butte Creek Valley irrigable by pumping. About 1,104,000 

 acres have been segregated for sale, pending examination. 



John T. Whistler and H. E. Green, engineers, made pre- 

 liminary reports upon the Klamath project in 1903, justifying a 

 further investigation this season. T. H. Humphreys, assistant 

 engineer, reporting to the supervising engineer, is now in 

 charge, with headquarters at Klamath Falls, Oregon. Topo- 

 graphic surveys of the Llorse Fly and Clear Lake reservoir 

 sites are being made under direction of T. S. Chapman. Esti- 

 mated area of Clear Lake site, about 20,000 acres. 



Near Keno, Oregon, F. K. Lowry is surveying the Klamath 

 River to determine the possibilities of lowering and draining 

 Lower Klamath Lake. Existing canal systems are also under 

 survey with a view to utilization in connection with the gen- 

 eral project. Gauging stations are maintained at many points 

 and records of fluctuations, evaporation, etc., are carefully 

 taken. ]\Iuch other important work is also in hand, some 

 of Avhich will be prosecuted through the winter. 



Sacramento Valley Project. — This is the northern portion 

 (4,19H sq. mi.) of the great Central Valley of California, 

 which, with the mountainous portions, has a total area of 

 26,187 square miles. The water supply is very great. From 

 1878 to 1885 the mean annual discharge of the Sacramento, 

 at Collinsville was 25.936.000 acre-feet. The valley is very 

 fertile, but the southern portion is subject to extensive over- 

 flow (800,000 acres flooded in March, 1904). 



Comprehensive work is planned in co-operation with the 

 State of California and in harmony with the work of the 

 Topographical branch of the Survey and the Bureau of For- 

 estry of the Agricultural Department. 



The Avestern side of the drainage basin and the northern 

 portion as far as Pit River, inclusive, have been examined 

 and reservoir sites surveyed aggregating in estimated capacity 

 1,800,000 acre-feet. Eight gauging stations are now main- 

 tained under the care of J. S. Evans, hydrographer. Stream 

 measurements have been regularly taken at numerous points 

 on tributaries. Estimates of cost of constructing dams on 

 Putah Creek and at Jelly's Ferry have been prepared by H. 

 E. Green, engineer. 



