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Two vols. 4to. [1], 34 leaves mimeograph typescript in vol. I, w/ 7 large folding cyanotype blueprint maps, many w/ hand-colouring and annotations added in order to show progress of project; vol. II w/ 1 detailed typescript leaf of table of contents for the 17 cyanotype blueprint maps, some w/ annotations, all numbered, most large folding, with sizes from 8 x 10 in. up to 21 x 31.5 in. Uniformly bound in Charles H. Potter expandable half-red calf over black cloth post-binders, punch-sewn at gutter margins, first vol. w/ brass screws, 2nd vol. sewn w/ green cord, hand-lettered label on spine of vol. I, spine label on vol. II perished at head of spine(some chipping & creasing to spines, some lifting), still a VG set. These original mimeograph Reclamation Service engineering volumes detail the specifications for the construction of the Keechelus Dam and Keechelus Lake project at the beginning of the 20th century as part of six reservoirs intended originally to fertilize the verdant Yakima Valley. The Pacific Northwest private irrigation companies lacked the capital and engineering expertise to make the investment, so through the Land Reclamation Act of 1902, the Keechelus project arose. Employing over 600 engineers, surveyors, and laborers, The Keechelus Dam was completed from 1913-1917 at the head of the Yakima River, and provided about 15 percent of the water stored for the Yakima Irrigation District. By the end of the 1990s, it was determined that the dam was facing potential failure from piping and erosion, so an elevation of 2510 feet was imposed, and modifications and reconstruction were undertaken to control seepage and reduce erosion. The maps included in these volumes encompass the size of the Lake Dam, the Spillway, elevations of the Spillway, Plan and Profile of the original dam under construction, detailed record map of test pits, as well as relocation of State Roads. Swigart (1864-1928), was an Ohio-born civil engineer who had been located in Everett, WA at the time the project was first proposed, and by 1903 was located in Yakima, WA overseeing and directing the variety of reservoir projects, as well as the reports on stream-flow records previously under the direction of the Geological Survey. Many of these maps show progress reports in hand-colouring indicating areas finished, or under construction. No copies located in Worldcat.