an attractive first unit could be worked out with Owyhee River as a source of supply. The summer flow of Owyhee River having been fully appropriated, examination was made of the Owyhee watershed for practicable storage reservoirs. At Duncans Ferry a favorable site was found for the construction of a dam, which if 100 feet high, would store 190,000 acre-feet, and if 150 feet high would store 480,000 acre-feet. A less favorable storage reservoir was located at Red Butte Valley. Diamond drill borings were made at both locations to determine position of bed rock at dam sites. Preliminary plans and estimates were made on the basis of irrigating 63,000 acres 27,000 acres north of the Owyhee as far as Arcadia and 36,000 acres south of the river, principally south of Sucker Creek, and consequently in the State of Idaho. Storage of 150,000 acre-feet with a 90-foot dam at Duncans Ferry was deemed sufficient in connection with available river flow during a portion of the irrigation season and was made the basis of estimates. A suitable point of diversion was located 4 miles upstream from Mitchell Butte. The final results indicated an acre cost even higher than that of the Malheur division, for which reason work on the entire project has been indefinitely deferred. All lands withdrawn, except for reservoir sites, have been restored to entry. The expenditures are summarized in the following table: Expenditures, according to purpose and nature, on proposed Malheur project to June 30, 1906. PROPOSED CENTRAL OREGON PROJECTS. Silver Creek, Chewaucan, Ana River, Silver Lake, Odell Lake, and Crescent Lake projects in central Oregon have been described in the Third Annual Report, second edition, pages 471 to 486. No further detailed investigations have been made in this region but stream measurement work has been continued in order to obtain information in regard to the available water supply in case it should be advisable to take up these projects in the future. The expenditures are summarized in the following table: Expenditures, according to purpose and nature, on proposed central Oregon projects to June 30, 1906. [Total, $22,629.23.] OREGON-CALIFORNIA. KLAMATH PROJECT. GENERAL STATEMENT. The principal data relating to the Klamath project are summarized below. Summary of principal data relating to Klamath project. Counties: Klameth, Oreg.; Siskiyou and Modoc, Cal. Latitude: 42°. Longitude: 121°. Townships: 33-41 south, 6-14 east, W. M., 46-48 north, 1-8 east M. D. M. Irrigable area: 236,000 acres. Average rainfall: 15 inches. Estimated run-off: 3,000 second-feet. Range of temperature: Maximum, 105°; minimum, -26°. Average elevation: 4,100 feet. Principal products: Alfalfa, wheat, vegetables, and fruits. Nearest railroad: Klamath Lake Railroad. Nearest station: Pokegama, 36 miles. Principal markets: San Francisco, Cal., 451 miles; Portland, Oreg., 443 miles. Reservoir area: Clear Lake, 25,193 acres; Horsefly reservoir, 4,534 acres. Capacity of reservoirs: Clear Lake, 462,356 acre-feet; Horsefly reservoir, 157,865 acre-feet. Duty of water: 1 second-foot for 100 acres. Height of dams: Clear Lake, 30; Horsefly, 70 feet. Length of dams: Clear Lake, 850 feet; Horsefly, 480 feet. Type of dams: Rock filled. Length of canals: 174 miles. Length of laterals: 255 miles. Power developed: 2,000 horsepower. Tunnels: 3,300 feet. Per cent public land: 23. Character of soil: Rich lake bottom, decomposed basalt. The Klamath project (Pl. LXXIX) is situated Oreg., and Modoc and Siskiyou counties, Cal. Upper Klamath Lake in Oregon, Clear Lake in and Lower Klamath Lakes in California and and LXXXI). in Klamath County, Within its area are California, and Tule Oregon (Pĺs. LXXX The two principal valleys included in the project are those of Lost River and the upper portion of Klamath River. Lost River drains the watershed tributary to Clear Lake, the latter acting as a natural reservoir for the partial control of the flow of that stream. Klamath River takes its water supply from Upper Klamath Lake, and its flow is also regulated by the natural storage afforded by this lake. Lost River from its source at Clear Lake in California makes a broad detour through Oregon and finally discharges its waters into Tule Lake near the Oregon-California boundary. The waters which reach this point are lost by evaporation from the surface of Tule Lake. Klamath River flows in a general southwesterly course and discharges its waters into the Pacific Ocean. The sources of water supply for the project are Clear Lake and Upper Klamath Lake, both of which are admirable natural reservoir sites. Horsefly Reservoir site on Miller Creek, a tributary of Lost River, has also been considered as an auxiliary supply in case it should be necessary. Clear Lake requires but a low dam on Lost River to give it the necessary capacity, while Upper Klamath Lake requires only the construction of regulating works. For convenience, the project is considered in two parts-an upper and a lower division. The upper division includes the portion of the project that takes its water supply from Lost River, while the lower division obtains water from Upper Klamath Lake. The lands of the upper division include Langells, Yonna, and the upper portion of Poe valleys. The lower division includes the Klamath Valley and the lower portion of Poe Valley, lands now in part under cultivation, and a portion of Tule and Lower Klamath lakes, which it is proposed to reclaim. The reclamation of Tule Lake will be accomplished by storing a part of the run-off into the lake for irrigation on the upper division and by diverting a part to Klamath River, thus allowing the lake area to shrink by evaporation. The reclamation of portions of Lower Klamath Lake and the adjacent marsh lands will be accomplished by drainage. The work so far undertaken is all within the lower division, the lands to be watered by the first unit being in the upper portion of Klamath Valley and in the lower portion of Poe Valley. In the following table are listed the contracts entered into for work on the Klamath project. This list includes contracts for excavation, embankment, masonry, and erection of structures, but does not include materials, such as cement, steel, timbers, etc. Contracts for building work on Klamath project to June 30, 1906. Bids for divisions 1, 2, and 3 of the main canal were opened December 29, 1905. This work involves the excavation of the main canal (Pls. LXXXII-LXXXVI) and the building of the headworks, turnouts, and bridges from the intake at the head of Link River to the first main division point near Olene, a distance of about 9 miles. Of this distance 3,300 feet is tunnel and 2,700 feet cement-lined canal. The remainder is open cut in earth. The canal is designed to have a maximum capacity of 1,500 second-feet. The contract for the first three schedules, which include all except the highway bridges, was awarded to Mason, Davis & Co., of Portland, Oreg. The contract for the 6 highway bridges was awraded to the International Contract Company, of Seattle, Wash. Work was begun by the contractors during the latter part of March, 1906. Progress at first was much delayed by bad weather and by inability to obtain supplies and equipment by reason of the bad condition of the roads from the railway terminus to Klamath Falls. |