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Show MUX DAM NEAR BOISE" AS SEEN BY AN OGDEN ENGINEER Government Has a Railroad and Town of Its Own at the Highest Dam in the World Reservoir Will Furnish Water For an Empire Description of the Plant I D- F Seerey, chief engineer of this district of the forest service, has re I turned from the Arrowrock dam of the government reclamation service near Boise, and he says that a won- I dcrful structure is being constructed I under the direct supervision of Charles H. Paul, engineer. The organization, or-ganization, he says, is perfect and many ingenlus mechanical appliances are In service. Here are some of the facts in regard re-gard to the dam as briefly noted: Government Railroad. The Arrowrock railroad runs from Barber Junction to Arrowrock. Length. 17 miles, Built in year 1911. Only standard gauge railroad In the country built and operated by the government. All materials and supplies sup-plies for the construction of the Arrowrock Ar-rowrock dam and the maintenance of the camp are brought in over this railroad. Boise Power Plant. The Boise power plant is at Boise diversion dam, three miles above Barber Bar-ber Junction on the Arrowrock railroad rail-road Operation started In May. 1912. Capacity 2500 to 3000 horsepower. Equipment, 3 alternating current gen erators, each direct connected to its turbine. Head about 30 feet. Output 3-phase. 60-cycle, alternai-fng alternai-fng current at 2300 volts which is transmitted from the station at 22-000 22-000 volts. Length of transmission lines to Arrowrock, Ar-rowrock, 15 miles These lines are in duplicate to insure uninterrupted service. This power plant is tied in with the system of the Idaho-Oregon Light &-Power &-Power company at their Barber power house and a contract has been made providing for an exchange of accommodations with that company With few exceptions, all the construction con-struction equipment at Arrowrock is run by electric power. The Boise power plant furnishes all the power for that work, and for lighting the work and the camp. . Sawmill. The saw mill is on Cottonwood creek about 17 mile6 from Arrowrock. Arrow-rock. by wagon road. Equipment consists con-sists of a Curtiss "Dixie D" mill with 40 horsepower engine Practically all lumber for camp and construction purposes Is cut at this mill. The to tal output will be more than 6,000,000 feet B. M Construction Camp. Construction camp Is at Arrowrock damsite. Fifteen bunkhouses and dormitories accommodate about 700 men. About 200 private houses and tents occupied b foremen, mechanics mechan-ics laborers, etc, with their families, not included in camp proper. Total population of community about 1000 to 1500. Mess House Seating capacity. H50. Serves 50.000 to 60,000 meals per month. Kitchen equipped with electric elec-tric vegetable peeler, vegetable masher, mash-er, vegetable slicer and dish washer, steam cooker, two steaming and carving carv-ing tables and ranges having a cooking cook-ing surface of 84 square feet Dining Din-ing rooms furnished with small tables ta-bles seating eight at a table. Warehouse Two stories, each 30 feet by 125 feet. Contains a full stock of supplies for all branches of the work as well as for the mess and the mercantile store The warehouse building contains a meat market where all meat for the mess is cut, and where the private families are supplied, a main refrigerating room with a capacity of 26,000 pounds of meat, two smaller refrigerators and a six-ton artificial plant. Mercantile Store Stocked with clothing, shoes dry goods, groceries, candy, cigars and tobacco and other miscellaneous articles to meet all needs of the men and families in the community. A soda fountain and lco cream parlor Is operated in connec tion with the store. Bath House Open day and night to any employe Equipped with six showers and two tubs. A barber shop is run In connection with the bath house. Laundry Open to all employes. Provided with set tubs, wash boards, drying racks, etc.. for the convenience conveni-ence of the men who do their own washing. Hospital Fully equipped with best modern equipment including X Ray apparatus. Doctor and two nurses on duty day and night. Office, operating op-erating room, ward containing eight beds, bath room, and three private rooms. A hospital fee of $1 per month is charged against each employe em-ploye and medical attention i6 furnished fur-nished where needed without further charge. Bunkhou6e - For laborers. Furnished Fur-nished with single bunks, each with springs and mattress, wash room and lounging room. No rental charged. Dormitories -For foremen, engineers, engi-neers, and office force, mechanics, and skilled laborers. Rooms for one to four men. each furnished with bed, table and chairs. A rental charge is made for all rooms in dormitories Clubhouse Open to all employes. Dimensions, 36 feet by 50 feet. Furnished Fur-nished with reading tables and chairs, two pool tables, a piano, a moving picture pic-ture machine, a phonograph, check ere, chess, etc. The Industrial branch of the Y. M. C. A. co-operates with the reclamation service in the maintenance and operation of this clubhouse. Entertainments are given giv-en in the clubhouse two or three times per week and a religious service serv-ice is held nearly every Sunday night. Heating Plant Furnished steam heat to all camp buildings except the cottages. Equipped with two Ke wanee 50 horse power high pressure boilers. Postoffice A postoffice has been established at Arrowrock and dally mail is received by stage from Boise. Other buildings include a bakery, n root cellar, a stable, an isolation hospital, a dining hall for the office and clerical force, and a cottage for the accommodation of official visitors. visit-ors. Water Supply Taken from Deer Creek above points of settlement Brought down in a covered flume to a 35,000 gallon tank about 300 feet above the camp buildings. Distributed Distribu-ted through the camp by means ol 6-inch wood stave pipe. Water is carried to practically all camp build ings. Fire hydrants are located at convenient points throughout the camp so that at least two standard fire streams, under 150 pounds pressure, pres-sure, can be put on to any building Water from this system is also carried car-ried to the work and used for construction con-struction purposes. A high pressure pump taking water from a well near the river bank is connected with the water system and may be thrown into service in case of necessity Sewerage System A complete sewerage sew-erage system, Including 6eptic tank connects up all the camp buildings. The sewers are built of wood, with manholes at convenient points. All I sewage passes through a large septic ! tank before being discharged into the j river. Construction Plant. General Workshop Comprises a wood working shop equipped with a 12-inch Universal wood working machine, ma-chine, and an 18-inch planer; mill work, wheel wrightlng. and general bench work are handled in this shop. A machine shop equipped with a 24 inch 18 foot lathe a 24-inch shaper, I a threading machine and other stand-! ard tools sufficient for all ordinary repairs A blacksmith shop equipped with three forges, a No. S Beaudry power hammer and a full equipment 01 UiaLtttMllll.il IOUIB. Sand Cement Plant Capacity 1000 barrels per day of 24 hours Consists Con-sists of a rock crusher and sand rolls, a rotary dryer, a ball mill a mixine machine and three 5-foot by 22-foot tube mills The sand cement is mad by blending ordinary Portland cement with about an equal volume of pulverized pul-verized granite. The granite is ob tained from the spillway excavation, run through the rock crusher and sand rolls, then through the dryer and into the ball mill where It Is pulverized pul-verized to pass a 20-mesh sieve It is then mixed with Portland cement ce-ment and ground with It in the tube mills to such fineness that about 95 per cent passes a 200-mesh slee. The resulting product is as strong s the original Portland cement Two 15-ton LIdgerwood Electric Ca bleways Span, 1500 feet. Height of head towers, 60 feet. Height of tail tower, 100 feet. Hoisting speed. 300 feet per minute Traveling speed, 1200 feet per minute. These cable ways take excavated material in 4 cubic yard skips from the pit to the screening and crushing plant Orange Or-ange peel and clam shell buckets may also be operated from these cable ways. The height of the cable above the foundations of the dam Is about 375 feet. Each cableway is run by a 500 horse power motor. One 70-ton Atlantic steam shovel, equipped with a 2 cubic yard and 2 1-2 cubic yard dipper One "Stone-1 drag line excavator, with 2 1-2 cubic cu-bic yard buckets and 70 feet boom Full 10-ton "American" stiff leg der ricks with 3-drum hoists and SO-foot booms Two No. 5 Austin rock crushers. crush-ers. Three 1 cubic yard "Smith" concrete con-crete mixers. Two "Crowe" concrete placing cableways and equipment. Miscellaneous equipment Including small derricks, dinky engines, care and trackage, pile drivers, pumps, motors, mo-tors, rock drills, etc. Diversion Work. Upper Cofferdam - About 200 feet long and 36 feet high Built of timber tim-ber cribs filled with rock and gravol with fine material sluiced in. Diverts the flow of the river into the diversion diver-sion tunnel. Diversion Tunnel Thirty feet wide. 25 foot high. Length. 500 feet, driven through solid granite Bottom and sides lined with concrete. Top lined with timber. Capacity about 20,000 second feet. Will carry any ordinary flood. Lower Cofferdam About 150 feet long and 25 feet high. Construction same as upper cofferdam Protects the work from back water. These diversion works were built for the purpose of diverting th-Boise th-Boise river around the work durlnq; the construction period. After the dam is completed the portion of the diversion tunnel that comes in the dam section will be filled with con crete. Arrowrock Dam. Principal Dimensions: Feet Maximum height, about 351 Thickness of base 240 Width at top 18 Radius of curvature 662 Length of crest 106o Length of spillway 400 Depth of foundation below river bed, about 80 Area of foundation, about 1 acre Principal Quantities Cub. Yds. Excavation for dam 250.00" Concrete in dam 530,000 Excavation for spillway 300.000 Concrete In spillway 10,000 Gates and accessories 1,000 tons 1 Capacity of reservoir 230,000 acre-ft I I Length of reservoir about IS miles; i and Includes both the Main river and the South Fork This dam, when completed, will be the highest in the world The concrete con-crete In the dam. if placed in a column col-umn 10 feet square would reai h to n height of about L'7 miles. About 12500 carloads of sand cement will be used I in the construction nf the dam. The I water in the reservoir will cover to a depth of 1 foot, an ara of 360; square miles. The Arrowrock reservoir, together) with the Deer Flat reservoir, will fur nish a late season water supply for about 240,000 acres of land in the Boise valley. The water from Arrowrock reservoir reser-voir is discharged into the Boise river riv-er and dherted into the New York canal at the diversion dam. about 8 miles above the City of Boise, and about fifteen miles below Arrowrock. |
