,u4,s4 ,,department ,,of ,,the ,,interior1 ,,stewart ,l4 ,,udall1 ,secretary ,bureau of ,reclamation1 ,floyd ,e4 ,dominy1 ,commissioner ,,glen ,,canyon ,,dam ,,physical ,,data--,,glen ,,canyon ,,storage ,,unit ,,dam ,type3 ,concrete arch4 ,height above river bed ft4 #ehj ,height above lowest ft4 #gaj point in foundation ,crest length ft4 #a1ejj ,crest width ft4 #be ,base width ft4 #cdj ,concrete cu4 #d1hcj1jjj yds4 7dam7 7powerplant7 #bge1jjj ,there are #c million cu4 yds4 in ,hoover ,dam1 and #aj million in ,grand ,coulee4 ,crest elevation ft4 #c1gae ,maximum discharge sec4 ft4 #bgf1jjj through spillways ,,reservoir ,capacity4 ac4 ft4 #bh1jdj1jjj ,area acres #afb1gjj ,elevation reservoir ft4 #c1gjj water surface ,the river elevation at ,glen ,canyon is #c1adb ft4 ,length4 miles #ahf ,,powerplant ,capacity kw4 #ijj1jjj ,number of units #h ,capacity of each kw4 #aab1ejj generator4 ,capacity of each turbine hp4 #aee1ejj ,illustration3 ,,the ,,project ,,and ,,the ,,dam ,,glen ,,canyon ,,florida ,,pine ,,river ,,ext ,,navajo ,,hammond ,,la ,,barge ,,seedskadee ,,lyman ,,flaming ,,gorge ,,central ,,utah ,,emery ,,county ,,silt ,,paonia ,,smith ,,fork ,,curecanti ,the ,glen ,canyon ,dam1 ,powerplant1 and ,reservoir1 which will be known as ,lake ,powell in honor of the western explorer and geologist1 ,john ,wesley ,powell1 are the principal storage and power features of the ,upper ,colorado ,river ,storage project4 ,the dam will be on the ,colorado ,river in ,arizona1 #ac river miles below the ,utah border4 ,lake ,powell will store about #bh1jjj1jjj acre feet of water--next in size to ,lake ,mead1 downstream1 ,america's largest man-made lake--to help solve a water resource development problem in the ,colorado ,river ,basin4 ,the crux of the problem is the division of the river's water between the ,upper and ,lower ,basins of the ,colorado ,river1 as provided by an interstate compact4 ,the volume of water flowing down the ,colorado fluctuates sharply from year to year4 ,consequently1 there must be long-term holdover storage capacity in order to meet downstream needs and compact requirements--including requirements for ,mexico under an international treaty--and still permit the ,upper ,basin ,states to deplete the river for upstream use4 ,this problem will be solved by construction of a system of storage dams and reservoirs in the ,upper ,basin1 of which ,glen ,canyon1 the largest1 is one of four initial units authorized4 ,only #ae miles above the dividing line between the ,upper and ,lower ,basins1 it will store no water for use upstream or in the immediate vicinity of the dam1 but is the principal unit storing water to regulate the river and thereby fulfill compact commitments to the ,lower ,basin4 ,the sale of hydroelectric energy generated at the multipurpose dams will return practically all of the cost of the project and a large part of the cost of #aa participating irrigation projects authorized for initial ,upper ,basin development4 ,that1 in general1 is how ,glen ,canyon ,dam on the ,colorado and three other initial dams on its tributaries will aid in developing the area4 ,the participating projects just referred to1 and scattered throughout the ,upper ,basin 7#aa of them authorized for construction71 will irrigate about #acj1jjj acres in new farms and improve irrigation on about #bcj1jjj acres in old ones4 ,some #be other projects are under various phases of study4 ,farming1 in consequence1 will greatly increase4 ,water from the #d big storage reservoirs will1 as planned1 turn generators of about #a1bjj1jjj-kilowatt capacity1 and industry will use the power4 ,mineral deposits of inestimable value1 uranium among them1 will be mined4 ,flood control and navigation on the ,colorado will be improved1 and the nation's playgrounds will be greatly enlarged1 for some of the world's finest recreation places will lie along the shores of the reservoirs or lakes that will form behind the dams4 ,glen ,canyon ,storage ,unit will be the keystone in this whole structure4 ,the dam spans the river near its exit from the ,upper ,basin1 as if in the spout of a great funnel where it can control all of the water in the funnel's cone--the ,colorado's own flow and all that its tributaries feed into it upstream from the dam4 ,the powerplant will generate about #ge percent of the project's total power and the reservoir will contribute about #ge percent of the water storage that the ,congress authorized in #aief as initial development for the ,upper ,basin4 ,this reservoir or lake1 extending #ahf miles behind the dam1 will be flanked by remarkably beautiful scenery4 ,the ,nation's gain in new public and private wealth will be tremendous4 ,the ,federal ,government will finance the project1 but the people who use the water and power will repay about #ii percent of the cost--about two-thirds with interest4 ,,bridge ,,at ,,the ,,damsite ,illustration3 ,bridge ,bridges were among the first essentials at ,glen ,canyon damsite4 ,the vertical walls of the ,canyon rise about #gjj feet above the river4 ,the distance from rim to rim is only #a1bjj feet in a straight line1 but it is about #aij miles by road4 ,the ,glen ,canyon ,bridge1 a spectacular rim-to-rim highway1 spans the canyon immediately downstream from the dam4 ,it is the highest and second-longest steel arch bridge in the ,united ,states2 its #a1jbh foot arch stands #gjj feet above the river4 ,the deck is #a1bga feet long4 ,the roadway is #cj feet wide and is paralleled by #d-;foot sidewalks4 ,the bridge was dedicated and opened to public use on ,february #bj1 #aiei4 ,materials and equipment are transported to the canyon floor by highlines--heavy cableways stretched between towers1 two on each rim4 ,loads of #ej tons are lowered from them on pendant hooks4 ,,construction ,illustration3 ,construction in progress ,glen ,canyon ,dam1 like all large ,reclamation dams1 is being built by private construction companies that are awarded contracts by competitive bidding4 ,the prime contract1 totaling #ajg1iee1abb1 was awarded to the ,merritt-,chapman and ,scott ,corporation of ,new ,york ,city1 ,april #bi1 #aieg4 ,it provides for construction of the dam and powerhouse and is the largest single contract the ,bureau has ever awarded and probably the largest for any type of construction project4 ,by ,june #aifj1 the contractor had completed the diversion and spillway tunnels1 lined them with concrete1 built the coffer dams 7temporary earth structures diverting the river around the damsite during construction71 and excavated the foundation of the dam4 ,first placement of concrete in the foundation of the dam and powerhouse was observed by public ceremonies at the damsite on ,june #ag1 #aifj4 ,initial storage of water behind the dam is scheduled for early #aifb4 ,a #f1cib1jjj contract for the manufacture of eight #aee1ejj-;horsepower1 #aej-r4p4m41 vertical-shaft hydraulic turbines for the powerplant has been awarded to the ,baldwin-,lima ,hamilton ,corp4 ,additional contracts for generators and other adjuncts will be awarded later to equip the dam and powerplant4 ,glen ,canyon's first hydroelectric generating unit is scheduled to go on line in #aifd4 ,,recreation ,,plans ,illustration3 ,water recreation ,the ,glen ,canyon of the ,colorado ,river is an unusually placid1 #afb-mile reach from ,hite1 ,utah1 to ,lees ,ferry1 ,arizona4 ,major ,john ,wesley ,powell1 who headed the first expedition down the river in #ahfi1 named it ,glen ,canyon because of the occasional oak glens along its banks and at its junctions with tributaries4 ,the #ahf-mile-long ,glen ,canyon ,reservoir 7,lake ,powell7 will extend upstream into ,cataract ,canyon4 ,the lake and adjoining lands have been established as the ,glen ,canyon ,national ,recreation ,area under the ,national ,park ,service of the ,department of the ,interior4 ,this is the status of ,lake ,mead and its environs behind ,hoover ,dam4 ,the ,park ,service will soon undertake construction of recreational facilities for public use as ,lake ,powell begins to fill in #aifb4 ,the ,glen ,canyon ,recreation ,area promises to become one of the ,nation's outstanding tourist attractions4 ,illustration3 ,lake ,powell1 behind ,glen ,canyon ,dam1 will be flanked by varied and beautiful scenery4 ,illustration3 ,the first placement of concrete--,june #ag1 #aifj4 ,illustration3 ,aerial view of dam and town ,,highways ,,to ,,glen ,,canyon ,,dam4--,excellent1 new1 paved highways have been built to the ,glen ,canyon damsite4 ,a #gf-mile highway through the highly scenic area has been built from ,kanab1 ,utah1 to the damsite4 ,a new #be-mile highway extends northward from ,bitter ,springs to the damsite4 ,both of these highway links connect with the ,glen ,canyon ,bridge to form a new link in ,u4,s4 ,highway #hi4 ,the ,glen ,canyon ,bridge was completed in ,february #aiei4 ,,distances ,,to ,,glen ,,canyon ,,from3 ,kanab1 ,utah #gf miles ,flagstaff1 ,arizona #ace miles 7,flagstaff and ,marysvale1 ,utah1 #aij miles from the damsite1 are nearest railheads47 ,cedar ,city1 ,utah #afa miles ,phoenix1 ,arizona #cjj miles ,salt ,lake ,city1 ,utah #chd miles ,national ,parks3 ,zion #ajj miles ,bryce #ach miles ,grand ,canyon1 ,north ,rim #abd miles ,grand ,canyon1 ,south ,rim #adb miles ,two #af mm4 color1 sound films1 ,canyon ,conquest and ,key to the ,future1 are available upon request for showing to school and civic groups1 clubs1 and other public gatherings4 ,both films show men and machines at work on this challenging ,reclamation project4 ,send your requests to3 ,u4,s4 ,department of the ,interior1 ,bureau of ,reclamation1 ,p4,o4 ,box #cfj1 ,salt ,lake ,city #aj1 ,utah4 ,eastern area residents may write to the ,u4,s4 ,department of the ,interior1 ,bureau of ,reclamation1 ,washington #be1 ,d4,c4 #aifa--,,revised ,u4,s4 ,,government ,,printing ,,office3 #aifj ,,of--#egdegg ,,questions ,,and ,,answers ,,glen ,,canyon ,,dam ,u4 ,s4 ,,department ,,of ,,the ,,interior1 ,,stuart ,l4 ,,udall1 ,,secretary ,,bureau ,,of ,,reclamation1 ,,floyd ,e4 ,,dominy1 ,,commissioner ,,the ,,dam ,,history ,q4 ,when was ,glen ,canyon investigated as a potential damsite8 ,a4 ,first in #aiba1 then again in #aidf and in subsequent years4 ,q4 ,when was ,glen ,canyon ,dam authorized for construction8 ,a4 ,april #aa1 #aief1 as part of the ,colorado ,river ,storage ,project4 ,q4 ,when did work actually begin8 ,a4 ,the first blast was detonated on ,october #ae1 #aief4 ,,completion ,,schedules ,q4 ,when is the dam scheduled to be finished8 ,a4 ,construction of the dam and powerplant is scheduled for completion in ,march #aifd4 ,q4 ,when is the first power scheduled to be generated8 ,a4 ,the first power should go on the line in the spring of #aifd4 ,,excavation ,,coffer ,,dams ,q4 ,what are the coffer dams8 ,a4 ,large1 temporary earth dams across the floor of the canyon and located upstream and downstream from the foundation and keyway areas which mark the axis of the dam4 ,q4 ,why are coffer dams built8 ,a4 ,to divert the ,colorado ,river around the damsite through huge diversion tunnels and to keep water out of the work areas during construction of the dam and powerplant4 ,the deepest excavation to bedrock in the dam foundation is #acg feet below the former river level4 ,,diversion ,,tunnels ,length 7,west7 #b1gdi feet ,length 7,east7 #c1jaa feet ,diameter 7lined7 of both tunnels #da feet ,q4 ,why does the west diversion tunnel carry the most water8 ,a4 ,because the intake of the west tunnel is #cd feet lower than the intake of the east tunnel4 ,,spillways ,q4 ,where are the spillway intakes located8 ,a4 ,they are just upstream from the keyways1 one on each rim of the canyon4 ,q4 ,where will the spillways discharge8 ,a4 ,steep1 inclined tunnels will extend from the spillway intakes to intersect with the diversion tunnels far below4 ,thus1 water going through the spillways will emerge from the diversion tunnels as the river water now does4 ,q4 ,what is the maximum combined capacity of the two spillways8 ,a4 #bgf1jjj cubic feet per second4 ,,powerplant ,q4 ,where will the powerplant be located8 ,a4 ,on the upstream side of the ,glen ,canyon ,bridge just below the dam4 ,the powerhouse will extend across the canyon floor parallel to the bridge4 ,q4 ,how large will the powerplant be8 ,a4 ,the powerhouse structure will be about #ffe feet long and about #afj feet1 or #af stories high1 above the downstream river level4 ,eight generating units will be installed4 ,the rated capacity will be #ijj1jjj kw for the powerplant4 ,q4 ,what are the square columns between the dam and the powerplant8 ,a4 ,these huge concrete piers will support the #ae-;foot diameter penstock pipes which will carry water from the reservoir through the dam and into the turbines in the powerplant4 ,,general ,q4 ,what are the numerous black spots above the tunnel portals and elsewhere8 ,a4 ,these are #h-;inch square metal plates on the ends of anchor bolts4 ,the anchor bolts extend into the rock to support the relatively thin outer layers of rock4 ,q4 ,what are the white markings on the canyon walls8 ,a4 ,survey control or reference points which have been painted on the rock4 ,q4 ,why was the small suspension footbridge built8 ,a4 ,more than #b years was required to build the ,glen ,canyon ,bridge--the highest steel-arch bridge in the world4 ,therefore1 the footbridge was built so workers could cross the #abjj-;foot wide canyon2 otherwise1 it was #bjj miles around by road4 ,,concrete ,,placement ,,general ,q4 ,how much concrete will the dam contain8 ,a4 ,there will be more than #e1jjj1jjj cubic yards of mass concrete in the dam1 and about #djj1jjj additional cubic yards in the powerhouse1 tunnels1 and other structures at the damsite4 ,,aggregate 7,sand and gravel for the concrete7 ,q4 ,where does the aggregate used to make concrete come from8 ,a4 ,from the streambed of ,wahweap ,creek1 #f miles from the damsite4 ,q4 ,is there a conveyor belt from the aggregate plant to the damsite8 ,a4 ,no4 ,the aggregate is hauled in large bottom-dump trucks4 ,,cement ,q4 ,how much cement will be needed8 ,a4 ,approximately #c million barrels1 or #ab1jjj1jjj sacks4 ,q4 ,where does the cement come from8 ,a4 ,from a new cement plant constructed by the ,american ,cement ,corporation near ,clarkdale1 ,arizona1 #ahh miles south of the damsite4 ,,pozzolan ,q4 ,what is pozzolan8 ,a4 ,pozzolan is a cement-like material which occurs in natural deposits4 ,q4 ,why is pozzolan used8 ,a4 ,pozzolan is cheaper than cement2 it reduces shrinkage in concrete and develops less heat in concrete during the curing period4 ,q4 ,where is it obtained8 ,a4 ,near ,flagstaff1 ,arizona1 about #aae miles from the damsite4 ,about #bbj1jjj tons will be used along with #efd1jjj tons 7#c1jjj1jjj barrels7 of cement4 ,,concrete ,,mixing ,,plant ,q4 ,what is capacity of the mixing plant8 ,a4 ,the maximum capacity is #dhj cubic yards per hour1 which is mixed in six1 #d-;cubic yard concrete mixers4 ,q4 ,how large is the mixing plant8 ,a4 ,it is #bag feet1 or more than #bj stories1 in height4 ,,highline ,,cableways ,q4 ,what will the highlines do8 ,a4 ,their main function is to carry the buckets of concrete from the batch plant to points of placement in the dam and powerplant4 ,q4 ,what is the size and weight of the concrete buckets8 ,a4 #ab cubic yards4 ,when filled1 the buckets weigh #ca tons1 #bd tons of which is the concrete carried in the buckets4 ,q4 ,how large are the highlines8 ,a4 ,the higher towers are #aij feet tall2 the main cable is #d inches in diameter and about #b1jjj feet long4 ,,refrigeration ,,plant ,q4 ,why is the refrigeration plant necessary8 ,a4 ,a large amount of heat is produced by the chemical action of cement during the setting of the concrete4 ,the heat must be removed to prevent expansion and cracking of the concrete4 ,the refrigeration plant supplies the slush ice and cold water necessary to reduce this heat4 ,q4 ,how is the heat controlled8 ,a4 ,first1 the aggregate is sprayed with ice water before going into the mixers4 ,second1 slush ice1 along with water1 is used in mixing the concrete4 ,third1 cold water is pumped through pipes embedded in the concrete to carry away the heat generated4 ,q4 ,how long will cold water have to be pumped through the cooling tubes in the dam8 ,a4 ,approximately #ab days immediately following placement of the concrete to prevent uncontrolled cracking4 ,then for about #eb days in the second stage1 which may be many months later and which is for the purpose of assuring uniform shrinking of the huge concrete blocks4 ,,concrete ,,blocks ,q4 ,how large are the blocks of concrete placed in the dam8 ,a4 ,they vary in size4 ,the largest are #gj feet by #ahj feet in area2 all blocks will be #g feet thick4 ,q4 ,why are blocks used rather than building the dam as one solid piece8 ,a4 ,primarily1 block placement facilitates cooling of the concrete and controls cracking due to contraction of the concrete4 ,after the blocks have set and cooled1 a mixture of cement and water 7called grout7 is pumped under high pressure into cracks between the blocks to form one solid mass of concrete4 ,,page1 ,,arizona ,,general ,q4 ,after whom was the town of ,page named8 ,a4 ,the late ,john ,c4 ,page1 who served as ,commissioner1 ,bureau of ,reclamation1 from #aicg to #aidc4 ,q4 ,was there a community on the site of ,page prior to #aieg8 ,a4 ,no1 nothing but raw desert land like that now surrounding the community4 ,,climate ,q4 ,what is the elevation of ,page8 ,a4 #dcjj feet1 or about #ejj feet higher than the rim of the canyon4 ,q4 ,what are the extremes of temperature in ,page8 ,a4 #aje degrees in summer2 #aj degrees in winter4 ,,accommodations ,q4 ,does ,page have overnight accommodations8 ,a4 ,yes1 two modern motels are open year around4 ,q4 ,are there any restaurants8 ,a4 ,yes1 there are now four restaurants in ,page4 ,in addition1 the contractor's mess hall is open to the public4 ,,dps1 ,utah ,general ,depot1 #e-fa1 #ajj,m ,transcriber's ,notes --,silently corrected a few typos4 --,retained publication information from the printed edition3 this e,book is public-domain in the country of publication4 --,in the text versions only1 text in italics is delimited by underscores4 --,transcribed or tabulated some text within illustrations4