EXPENDITURES. The expenditures to June 30, 1907, are summarized in the following tables: Expenditures, according to physical features, on Strawberry Valley project to June 30, 1907. Total expenditures, according to purpose and nature, on Strawberry Valley The proposed Bear Lake project involves the entire Bear River drainage, and possibly areas in Wyoming and Idaho. In view of the importance attached to the possible development, the hydrographic inquiry has been continued and somewhat extended during the last year, but no detailed surveys have been made. The general conditions are fully described in the Third Annual Report of the Reclamation Service, second edition. The net expenditures to June 30, 1907, are $18,761.28. PROPOSED UTAH LAKE PROJECT. The proposed Utah Lake project is fully described in the Third Annual Report, second edition. This project is not considered feasible at present, and all active work has been discontinued. The net expenditures to June 30, 1907, are $34,040.05. WASHINGTON. OKANOGAN PROJECT. GENERAL STATEMENT. The general features of the Okanogan project are summarized below: Summary of principal data relating to Okanogan project. County: Okanogan. Township: 33 and 34 north, ranges 25 to 27 east. Latitude: 48° 30'. Longitude: 119° 40'. Average elevation: 1,000 feet. Nearest railroad: Great Northern. Nearest station: Oroville, 50 miles. Principal market: Local. Irrigable area: 8,000 acres. Character of soil: Volcanic ash, sand, and gravel. Range of temperature: Maximum, 105°; minimum, 10°. Farm unit: 40 acres. Value of irrigated land: $200 to $500 per acre. Principal products: Fruit, hay, nuts, vegetables, and grain. Duty of water: 3 acre-feet per acre per annum (diverted). Watershed area: 140 square miles. Average rainfall: Drainage area, 17 inches. Average annual discharge: 30,000 acre-feet. Capacity of reservoir: 15,000 acre-feet. Reservoir area: 650 acres (450 in Conconully reservoir, 200 in Salmon Lake reservoir). Type of dam: Earth embankment. Height of dam: 60 feet. Lenth of dam: 1,000 feet. Diversion dam: Concrete, 50 feet long, 4 feet high. Length of main canal and main laterals: 20 miles, 100 to 30 second-feet. The Okanogan project will provide water for the irrigation of about 10,000 acres, of which 1,350 acres have old water rights, leaving 8,650 acres to pay for the project. The water supply is obtained from Salmon River, a stream which drains about 152 square miles in the eastern foothills of the Cascade Mountains. Investigation of the project by the Reclamation Service was commenced in 1903 and continued in 1904. In April, 1905, a board of engineers visited the project and recommended that the investigations be continued and completed, which recommendation was approved. In October, 1905, another board recommended that it be authorized for construction. This recommendation was approved by the Secretary of the Interior December 2, 1905. RESERVOIRS. To utilize the entire flow of Salmon River in years of low run-off a total storage capacity of 13,000 acre-feet is necessary. This storage is obtained in Salmon Lake reservoir and Conconully reservoir. 224 Salmon Lake reservoir, a natural lake about 3 miles long, immediately east of the town of Conconully, is on a small branch of the North Fork of Salmon River. It has an available capacity of 2,000 acre-feet, the low-water elevation being 2,285 feet and the highwater 2,295 feet above sea level. The inlet canal has a capacity of 13 second-feet and is lined with paving. The outlet is through a simple concrete structure. No dam is used for this reservoir. Conconully reservoir, immediately south of the town of Conconully, will be created by building an earthen dam across Salmon River below the junction of the North and West forks. The capacity of the reservoir will be 13,000 acre-feet. The dam will have a maximum height of 60 feet and a length of 1,000 feet. The high-water elevation is 2,287 feet above sea level, and the maximum draft is 52 feet. The outlet will be through a concrete-lined tunnel and will be controlled by two 36-inch cast-iron gates. In April, 1907, construction by force account was commenced at dam site No. 1, but on opening the cut-off trenches it was found that previous exploration by borings had not revealed the true nature of the material below the surface, which was found unsuitable for dam foundation. A board of engineers, after examining the work on May 22, 1907, recommended that this site be abandoned and that operations be transferred to dam site No. 2. This recommendation was approved and construction work at the latter site is now in progress by force account. CANALS AND DISTRIBUTION SYSTEM. After passing the Conconully reservoir the water will follow the natural bed of Salmon River for about 12 miles to the point of diversion, which is at an elevation of 1,371 feet. The diversion is accomplished by a concrete weir 50 feet long and 4 feet high. The main canal has a capacity of 100 second-feet. Irrigation commences about 1 mile below the diversion weir. There will be about 20 miles of main canals and main laterals, varying in capacity from 100 to 30 second-feet, and about 30 miles of small laterals with a capacity of less than 30 second-feet. About one-half mile of canal will be lined with concrete. The structures in the distribution system will all be of wood, except two drops in the main canals, which will be of con crete. The canals and distribution system are now being constructed almost entirely by small contracts, some special work being done by force account. H. Doc. 63, 60-1-15 IRRIGABLE LANDS. The distribution of irrigable lands is shown by the following table: Irrigable lands in Okanogan project, Washington, in acres. The irrigable lands have an elevation of 850 to 1,350 feet above sea level, and lie in a series of benches sloping toward Okanogan River. The soil is mainly sand, light loam, and volcanic ash. Irrigated lands in alfalfa yield a profit on a valuation of $100 per acre, and lands in fruits or nuts, for which the soil is specially adapted, yield profits on a much higher valuation. Without irrigation the lands are practically worthless. WATER USERS' ASSOCIATION. The Okanogan Water Users' Association was organized in October, 1905, and through this organization all required private lands have been committed to the project. PURCHASE OF LANDS AND RIGHT OF WAY. All the lands necessary for the storage works have been purchased at a total cost of about $30,000. The lands necessary for right of way for the canals were all patented subsequent to 1888; consequently it has not been necessary to acquire right of way by purchase. MATERIAL AND EQUIPMENT. Cement to the amount of 2,520 barrels has been purchased from the Pacific Portland Cement Company. Gates and necessary construction equipment are either en route or already on the ground. EXPENDITURES. The expenditures to June 30, 1907, are summarized in the following tables: Expenditures, according to physical features, on the Okanogan project to June 30, 1907. Total expenditures, according to purpose and nature, on Okanogan project to A detailed statement of the scope and important features of the Yakima district projects appeared in the fifth annual report and need be only briefly reviewed here. This district comprises the entire Yakima Valley, extending from the eastern slope of the Cascades to Columbia River. It has been divided into five distinct units or subprojects, as follows: Kittitas, Tieton, Wapato, Sunnyside, and Benton. These will be treated independently, this general statement concerning itself only with features and operations affecting the subprojects as a whole. Investigations in this district were begun in 1905, and have passed from preliminary studies of all subprojects to actual construction of two. Yakima River and its tributaries are the sources of water |