THE following is a brief recapitulation of four signed articles written by the supervising engineers of the various projects. Unfortunately, the original articles arc too lengthy for inclusion in the present issue. They are published in the current issue of the SCIENTIFIC AMERICAN SUPPLEMENT, together with a large number of illustrations from photographs furnished by the Redama,on Servicc.-ED. Washington Division. Charles H. Swigart Supervising Engineer. The Washington Division comprises all of the State of Washington and the extreme northern part of Idaho. The Reclamation Service has completed one project, the Okanogan, and is now constructing the Yakima project. OKANOGAN PROJECT.-The Okanogan Project, now completed, provides for the irrigation of land in the valley of the Okanogan River. Water is stored in Salmon Lake, and in Concully Reservoir, the two having a combined capacity of 15,000-acre feet. An earth dam a thousand feet long, 64 feet high, has been built aCrOSS Salmon Creek. This is the only dam constructed by the hydraulic hill method by the Reclamation Service. The irrigable land, amounting to about 8,650 acres, is of volcanic ash, sand and gravel. The building charge per acre is $65, and the annual maintenance and operation charge is $2. YAKIMA PRo.mC.-The Yakima Projcet embraces all the land in the Yakima Valley that can be watered from the Reclamation Service works, together with some lands in the Columbia Valley, near the mouth of the Yakima River. This project, for convenience, is divided into the Storage, Kittitas, Tieton, Sunnyside and Wapato Units, with the High Line, including the Benton Unit, or the Benton Unit alone, as alternative propositions. The Storage Unit includes wOlks for impounding the food waters of the Yakima and its tributaries, in five separate reservoirs, which will have a total capacity when fully developed of approximately 928,000 acre-feet. The Kittitas Unit, for which surveys have been made, embraces 62,000 acres of land on both sides of the Yakima River. The Tieton Unit, containing some 34,500 acres, lies west of the city of North Yakima, and between the Naches River and Ahtanum Creek. The Sunnyside Unit, containing 100,000 acres, receives its water from the Yakima River, just below Union Gap. The Wapato Unit consists of 114,000 acres on the right bank of the Yakima River, just below Union Gap. This land was allotted to the members of the Yakima tribe of Indians. The Banton Unit includes from 12',000 to 150,000 acres of land on both sides of the Yakima River, near its junction with the COlumbia. The High Line Canal will, if constructed, furnish water for the lands on the left bank of the Yakima River above existing canals. Northern Division. H. M. Savage Supervising Engineer. The Northern Division comprises the States of Montana, and North Dakota, and South Dakota, and northern Wyoming, and includes the Missouri River drainage basin, with the Yellowstone River in Montana and the Big Horn River in Wyoming. Within this area the construction of seven Reclamation Service irrigation projects has been authorized. Construction has progressed to the extent that at least one unit of each project has been completed, and all the large feature structures on several of the projects are now constructed. The flat grade of the Missouri River rendering th.) construction of gravity irrigation canals impossible, the construction of the NORTH DAKOTA PUMPINll PRO.ECTS was found to be dependent upon the development of power from the ample fuel supply in local lignite beds, and its transmission electrically to operate centrifugal pumps mounted on floating barges on the Missouri River. The barges are taken out of the stream at the end of the season and again launched at the beginning of the next irrigation season. THE LOWER YELLOWSTO:E PROJEcT.-The Lower Yellowstonf Project in eastern Montana and North Dakota covers 60,000 acres, and is nearly completed. It includes a. timber crib rock-filled diversion dam, which provides an overflow depth of 25 feet. The Yellowstone River at the site of this dam has a maximum flood flow of 160,000 cubic feet per second. THE SHOSHONE PROJECT in northern Wyoming will reclaim 164,000 acres of land, with a feasible extension to cover 300,000 acres. The principal features are the Shoshone Dam, the highest masonry dam in the world (328.4 feet), which regulates the discharge of the two Shoshone rivers, and whose reservoir is now filled to the spillway, and the Corbett Tunnel, three and a half miles long, with a discharge capacity of 100,000 cubic feet per second. THE HUNTLEY PROJECT on the Yellowstone River has an area of 32,000 acres, of which 28,000 acres is now settled. The success of the Huntley settlers is unprecedented. The crops on the irrigated area the second season realized a value of $25 per acre. The project has now thirteen public schools and six church organizations. THE SUN RIVER PROJECT, west of Great Falls, is the largest in the division, the available water supply being from 200,000 to 300,000 acres. It is now entering on its third season of cperation. The main features are high storage dams and a canal of 2,500 cubic feet per second capacity. THE MILK RIVER PROJECT in northern Montana depends on the waters of the St. Mary drainage basin, which discharges into Hudson Bay. It involves 200,000 acres of land, ald, fcur million dollars has recently been provided for carrying on the work. INDIAN 'ESERVATION IRRIGATION PROJECTs.-The Reclamation Service is constructin! works on the Flathead, Black Feet and Fort Peck Indian reservations, each of which has an area of about 150,000 acres of irrigable land. Most of this has been allotted to the Indians in severalty, and the receipts from the sale of excess lands will . return the cost of the irrigation works. The ultimate development of the FI.ATIIEA' PROJECT involves the construction of fifteen storage reservoirs, and the construction and operation of a hydro-electric pumping plant. Idaho District. }'. E. Weymouth Supervising Engineer. The Idaho District embraces that portion of the Snake River Basin from its headwaters in the Y'llowstone National Park in Wyoming to its confluence with and including the Salmon River, a total area of about 90,000 square miles. It embraces the Boise, Minidoka and Snake River Storage projects. BOIS], PROJECT.—This embraces 243,000 acres of land on the south side of the Boise River between its confluence with the Snake River and the city of Boise. The principal engineering features are: First, a storage dam, 1,025 feet on the crest and 340 feet high, which wil! be the loftiest dam in the world. It will impound 207,000 acre-feet of water for use in the low water period, on lands in the upper portion of the project. The lower portion will be supplied from the Deer Flat Reservo:r, which is filled by water diverted from the Boise River, and will have a capacity of 170,000 acre-feet. The main south-side canal for carrying the water has a capacity of 3,500 feet per second, and is forty miles in length, six of which are lined with concrete. MINIDOKA PROJECT.-The principal engineering feature. of this project, which embraces an area of about 132,000 acres on both sides of the Snake River in central southern Idaho, are the Minidoka Dam, head-works, power plant, and pumping stations. The dam, 736 feet long and 86 feet high, is of the rock-filled type. It is flanked by the power plants and north side head-works on the north and a solid concrete” spillway 2,400 feet long, and the south side headworks:on the south side. The power plant includes five .urblgenerators of 1,500-kilowatt capacity, which, during the irrigation scason, pump watpr to 47,000 ayres of high land, and also serve to furnish the towns .on tha project with light, power and heat. Nearly all of the business houses and many of the private houSes in the thriving towns of Rupert, Heyburn and Borley use electrical energy for heat. The three pumping stations on the south side lift the water in three stages to a total height of 90 feet. By means of reinforced concrete piers, the water of the reservoir can be raise: five feet. thus increasing the storage capacity and the available head on the turbines. SNAKE RIVER STORAGE. -This contemplates the storage of flood water of the rivers in reservoirs, so as to regu:ate its flow to conform to the needs of irrigation and power. Jackson Lake Reservoir, just south of the Yellowstone National Park, is completed. A reinforced concrete dam and an earth dike form a reservoir of 380,000 acre-feet capacity. Intermountain District. R. F. Walter Supervising Engineer. The work of the Intermountain, sometimes known as the Central District of the Reclamation Service, covers a territory in which irrigation has been employed as a means of distributing moisture to grow crops since the earliest settlement by the pioneers, who turned their attention from the search for golrt to the work of diverting the waters from the streams onto the barren land. They were so successful that agriculture quickly overshadowed the mining industry. Some one suggested the storage of the flood waters in reservoirs, for use after the streams had been reduced in flow. This work began about 1890, since which time thousands of storage basins have [Continued on Page no 156.) (Continued from vaue 149.) been built, so that now, on many streams, no water escapes whatever, and the lower roaches of the river bed have been grown over with trees and vegetation. Tlt0 reclamation work in this district is scattered over the States of Colorado, Kansas, Nebraska, South Dakota, Oklahoma, and southern Wyoming. In the valleys the rainfall varies from 6 to 16 inches; in the mountains above the project, it reaches as high as 30 and 40 inches. The value of the irrigated lands ranges from $75 to $100 per acre in the northerI y projects, to $100 to $1,000 in the southern projects, much of this land having sold for $3 to $10 per acre before the projects were inaugurated. UXCOMPAHGRE PROJECT, COLORADo.-In the Uncompahgre Valley is a body of fine land of 150,000 acres, but the run-off of the Uneompahgre River is limited, and after settlement a succession of crop failures followed. It was found that the run-off of the Gunnison River in the adjoining valley was very large; hence arose the suggestion to tunnel the intervening mountain, and divert the Gunnison River into the Uncompahgre Valley. An attempt was made to do this, bnt the cost was too great. The Reclamation Service took hold of the ,ork, and completed the tunnel, SIX mIles Il length, whIch has been I. I use now durl. llg tho past two seasons. One hundred an(l forty thousand acres :n the Uncompahbre Valley have now an assured water Slpply, which is to be augmented by bUl. ldllg a reservoir on Taylor RiveT, a tributary of the Gunnison. GRAND VALLEY PROJECT, COLORA])O.-This project in :1esa County, western Colorado, is designed to irrigate the higher Mesa lands, which include th.) 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