Show CONSTRUCTION DATA SHOWS EXTENT OF MOON LAKE LAIE PROJECT Construction data showing the thc extent of the work and explaining explaining explaining explain explain- ing features of construction of I Ithe the Moon Lake reservoir are contained contained con con- Lathed in a very interesting article article ar ar- ar- ar tide which Mr E. E J J. J Wester- Wester house construction engineer has written to be published in the Reclamation Era Bureau of Reclamation Reclamation Reclamation Rec Rec- publication Through the courtesy of Mr we are here submitting submitting submitting sub sub- salient points from this article which should be of interest interest interest inter inter- est to the reader and which will help create a better understanding understand understand- ing of the project by those who visit it July Allotted For Project Co Construction ruction of Moon Lake project was approved by the i President of the United States I Ion on November 6 1935 The sum of was allotted to the project by the P P. W. W A. A and the E. E R. R A. A for construction costs The dam site lies lie's 35 miles north of Duchesne on the wooded south I Is s slope ope of the Uinta tints Mountains I The fill earth-fill dam was built to form above Moon Lake outlet a aI I reservoir of feet acre-feet ca ca- The dam and reservoir clearing including engineering and overhead cost As additional features the project al also also atso at- at so includes construction Uon of the storage dam and diversion diversion diversion divers divers- ion canals The The combined structures structures structures ures supplement water for acres along the Lake Fork and Uinta rivers thereby providing the irrigation farmers occupying these lands with a reliable water supply Awarded to T. T E. E Connolly The contract for the construct- construct Continued On Page 8 Construction Data Dat Shows Extent Of t Moon l Lake Project Continued From Page One Ion ton of Moon Lake was awarded to T. T E E. E Connolly of San Francisco Francisco Francisco Fran Fran- cisco California on April 3rd 1935 Contract earnings der including extra work total The cost of materials furnished the contractor by the government including all concrete concrete concrete con con- crete aggregates was The dam is of the fill earth-fill type the main body consisting of ofa ofa a L rolled embankment protected on the downstream slope by a heavy rock fill and by a layer of rip rap on the upstream slope Located d above the axis of the dam and designed to arrest percolation percolation percolation per per- is a concrete off cut wall built into the left abutment Quantities placed In the embankment embankment embankment em em- represent cubic cubic cubic cub cub- ic yards of fill earth-fill cubic yards of rock-fill rock and cubic cubic cubic cu cu- cu- cu bic yards of The dam has hasa a crest length of 1120 feet and andIs andis Is feet high above the lowest point of the foundation Design Altered The outlet works were originally originally originally origin origin- ally designed to accommodate inthe in inthe inthe the left abutment a concrete- concrete lined side channel spillway in open open open op op- op- op en excavation Under excavation the formation proved too unstable unstable unstable un un- un- un stable to hazard its construction whereupon the design was changed chang chang- ed to an open channel type lo located located located lo- lo on the right abutment The outlet tunnel which also served as a diversion tunnel during during during dur dur- ing the construction of the dam damis is circular in section having an inside diameter of 10 feet and an inch 18 thickness of concrete lining It is f fet et long Location of ot Mechanism Installation in the g gate te chamber chamber chamber cham cham- ber located 47 feet from the outlet portal of the tunnel consists consists consists con con- of operating mechanism and two 3 foot 3 inch by 3 foot 3 inch high pressure gates The outlet discharge is confined in two inch 42 diameter steel pipe pipelines pipelines lines installed in the tunnel from the thc gate connections to the needle needle ne ne- ne- ne edle valves the discharge discharge discharge dis dis- dis- dis charge at the thc lower portal of the tunnel Within the house are installed the control mechanism and the two inch 36 needle valves having a discharge capacity of second The permanent spillway with witha a rated capacity of second- second feet is located in the right abut abut- ment The channel is concrete lined having a total length of 1 feet exclusive of ped sections but including the stilling basin and spillway head- head gate structures Two foot 24 by foot 16 automatic arial anal gates Installed installed installed In in- stalled in the structure regulate the discharge of water over the spillway crest at elevation elevation eleva eleva- tion sixteen feet below the high water surface level of the reservoir |