. The Street railway journal . elow. The temporary dam will be 140ft. long at the base and 250 ft. at the crest, 50 ft. high and 160ft. in width at the base, thus giving it a factor of safety ofover 3. The slope of the up-stream side will be 3 to will be divided into seven cribs in the direction of thestream, and the foundation logs used for starting the cribs areremarkable for their size, being 140 ft. in length, thus reaching 738 STREET RAILWAY JOURNAL. [Vol. XXIV. No. 17. from bank to bank. The logs are all cut on the companysown property within half a mile of the site of the dam, andw
. The Street railway journal . elow. The temporary dam will be 140ft. long at the base and 250 ft. at the crest, 50 ft. high and 160ft. in width at the base, thus giving it a factor of safety ofover 3. The slope of the up-stream side will be 3 to will be divided into seven cribs in the direction of thestream, and the foundation logs used for starting the cribs areremarkable for their size, being 140 ft. in length, thus reaching 738 STREET RAILWAY JOURNAL. [Vol. XXIV. No. 17. from bank to bank. The logs are all cut on the companysown property within half a mile of the site of the dam, andwere hauled to the river and into the stream by wire cables anddonkey engines. The cribs of the dam will be filled with rockfrom the adjacent banks, most of which can literally be rolleddown hill directly into the cribs, thus making the cost a mini-mum. The contents of the dam will be about 35,000 cu. life of the log structure is estimated at twenty years, butafter it is completed the work will be begun on the permanent. FIG. 24.—FOUNDATION CRIBS OF CAZADERO LOG DAM masonry dam. Fig. 24 shows the foundation crib of the logdam. A lake or reservoir about 7 miles long will be created by thedam, and the water will be diverted at the south bank into theditch or open canal leading to the fore-bay reservoir. Thiscanal will be 28 ft. wide on the bottom and 12 ft. deep, andwill be built on a grade sufficient to give a velocity of about6 ft. per second. Its construction will be permanent, and no mentioned later. Fig. 25 illustrates the companys Lodge,which has been erected on one corner of the plateau for the useof the officers and engineers. Across the river through thetrees may be seen the station buildings at Cazadero. The power house will be located on the edge of the Clacka-mas River below the lower end of the reservoir, where a sheerbank 125 ft. in height will be utilized for the development ofwater by means of turbines. The initial installation will con-sist of three 2500
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
