. St. Nicholas [serial]. rintendents, a mess-housewith seating capacity of 650, warehouses, stores,bath-house, hospital, club-house, heating plant,post-office, telephone and fire departments, water,sewer, and light systems, sawmill, cement walks,— in short, all the essentials for modern goodliving. The splendid system of sanitation, so-ciality, and welfare of Panama was duplicatedon a smaller scale at Arrowrock. The dam, as finished, is 348 feet high, 240 feet thick at the base, tapering to 16 feet at the top,where there is a fine driveway, lighted at nightwith artistic electric lamps. The len
. St. Nicholas [serial]. rintendents, a mess-housewith seating capacity of 650, warehouses, stores,bath-house, hospital, club-house, heating plant,post-office, telephone and fire departments, water,sewer, and light systems, sawmill, cement walks,— in short, all the essentials for modern goodliving. The splendid system of sanitation, so-ciality, and welfare of Panama was duplicatedon a smaller scale at Arrowrock. The dam, as finished, is 348 feet high, 240 feet thick at the base, tapering to 16 feet at the top,where there is a fine driveway, lighted at nightwith artistic electric lamps. The length of thedam is 1060 feet, curving gracefully up-streamwith a radius of 662 feet. In its construction530,000 cubic yards of cement were used, suffi-cient to make a column ten feet square andtwenty-seven miles high. In addition to beinganchored to the granite on the bottom, the Ar-rowrock Dam is driven far into the stupendousmountains on each side —a concrete unit with themighty hills, which rear themselves above At the side of the dam is the spillway for thesurplus water. This has a length of 402 feet,and in the excavation of it 300,000 yards of rockand earth were removed. An unusual feature of this dam and one whichhas required especial foresight and design, is theprovision for bringing down logs, for the BoiseRiver is the drainage outlet for the greatest for-ests of yellow-pine and fir in the true Inter-mountain Region. It is the main driveway forlogs for the greatest sawmill in the world, whichoperates more than fifty miles of private railroadto bring its logs to the Boise River or direct toits gigantic mill. Before the next spring drive a protectivebreastwork just above the dam will be con-structed against those logs, and if the units ofthe drives are very large, provision is made todivide them up just before they reach the dam,and take each division over the dam separately. 366 NATURE AND SCIENCE FOR YOUNG FOLKS [Feb., At the left bank a boom will convey the logs
Size: 1752px × 1427px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordodgemar, bookcentury1800, bookdecade1870, bookyear1873
