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<br />... '-' - ~ <br /> <br />"3 <br /> <br />. <br /> <br />. <br /> <br />" <br />NORTH PLATTE <br /> <br />'''q1 <br />RIVER PROJECTS <br /> <br />WATER SUPPLY & UTILIZATION REPORT <br /> <br />BUREAU OF RECLAMATION <br /> <br /> <br />UNITED STATES <br />DEPARTMENT OF THE INTERIOR <br />BUREAU OF RECLAMATION <br />P.O. BOX 1630 <br />MILLS, WYOMING 82644-1630 <br />OFFICIAL BUSINESS <br />PENALTY FOR PRIVATE USE. $300 <br /> <br />~Check here & return for address correction <br /> <br />Pathfinder Dam, completed in 1909 <br />created the worlds largest manmade <br />reservoir at that time. The 215 foot <br />high dam is a masonry arch structure <br />constructed with granite blocks which <br />were cut from a quarry within a few <br />hundred yards of the construction <br />site. When full, Pathfinder <br />Reservoir can store 1,016,507 acre- <br />feet of water. The spillway in the <br />natural rock of the left abutment <br />provides for the overflow as shown in <br />the picture. The last spill occurred <br />from June 16 to July 26, 1986 during <br />which time the reservoir elevation <br />rose to 5851.64 feet allowing water <br />to flow at 1. 54 feet deep over the <br />spillway crest. Pathfinder Dam is on <br />the National Register of historic <br />places. <br /> <br />FIRST CLASS <br />