Wyoming; built 1903 and 1904; rubble masonry; length 410 ft; max. height 96 ft.; contains 14,422 cu. yd.
Total cost of dam including water rights, land, clearing, building, excavation, outlets, spillway, engineering, superintendence, general expense.........................................= $109,194.
Rubble masonry cost the contractor:
Per cu. yd. Masonry
Quarrying 9414 cu. yd. at $1.96.........
Mortar 5008 cu. yd. at $1.93...........
Laying 14422 cu. yd. at $1.11...............
Cement 8844 barrels at $3.58,.................
The dam has a base thickness of 128 ft. A cut-off trench extends 14 ft. below the general level of the foundation, or to 180 ft. below the crest of the dam. In the dam there is a drainage tunnel, 13 ft. above the foundation and 23 ft. from the upstream face.
From the bottom of this tunnel 122 3-in. drainage wells, 4 ft. to 5 ft. apart extend to a depth of 30 ft. below the foundation. A branch railroad about 19 1/2 miles long was built from D unlay on the Southern Pacific railroad over which was transported plant, cement and oil used for fuel in generating steam power. The principal items of plant were two 10-ton cableways of 1180-ft. and 1250-ft. span, four derricks with 70-ft. booms, five 1-cu. yd. Smith mixers, dumping into hoppers, seven 150-h.p. locomotive type boilers, two No. 7 1/2 D Gates crushers; sand crushing rolls compressor, 2-cu. yd. bottom dump buckets, cars and electric lights.
Limestone for concrete was quarried 1000 ft. to 2000 ft. north of the west end of the dam, and another quarry 500 ft. south of the east end furnished plums. (See page 3 7 for reference to stream diversion, and page 162 for masonry progress).
The first masonry was laid in November, 1911 and the last in December, 1912.
Fig. 57A. Section of Medina dam, Texas; built 1011 to 1913; length on crest 1580 ft., at river level about 600 ft.; max. height 166 ft.; contains 105,000
Boulder, Colorado; built 1009; cyclopean concrete; length 250 ft. on bottom, 625 ft. on crest; max. height 185 ft.; max. thickness 123 ft.; contains 140,000 cu. yd.
Above an elevation 145 ft. below the top of the dam transverse expansion joints were constructed each 48 ft. During construction the flow of the stream was passed through a 4 ft. X 6 ft. opening through the dam. Watershed 40 square miles, reservoir capacity 524,100,000, cu. ft.
(See page 32 for an account of the stream diversion works.) Plant included seven cableways, of which three were respectively 1000 ft., 1670 ft. and 2140 ft. long, and mounted parallel to the dam; the remaining four were each 670 ft. long, installed at right angles to the dam. At first coal was used for power but in 1902 a transmission line 23 miles long was built from Mechanicsville and electric power was used to run three Duplex two stage Rand air compressors.
Two of the compressors were 27 in. X 17 in. X 30 in. and one was 14 in. X 22 in. X 16 in. They furnished air at 80 lb. pressure to a system of Sin. air mains covering the work. The excavation amounted to 270,000 cu. yd. The maximum masonry progress was 8000 cu. yd. per month, and the labor cost of laying, not including mixing was said to be 60 cents per cu. yd. The total cost of the work has never been published.
Spier's Foils Dam.
(Eng.Record.March.3, 1902) Fig. 58-58A. Section of Spier's Falls dam, New York; built 1000 to 1005; length 55a ft.; max- height 150 ft.; contains 180,000 cu. yd.
Overflow dam - straight.
Contains 70,000 cu. yd. limestone rubble, contract price, $3.60 cu. yd.
(The Design and Construction of Dams.) (Water-Power, Frizell).
Fig. 59. Section of Colorado dam, Texas; built 1891 to 1892; rubble masonry; length 1115 ft.; height 66 ft.; contains 88,000 cu. yd.
Contains 18,000 cu. yd. granite facing, contract price $11 to $15 cu. yd.
The granite was quarried 80 miles from the dam. Cost $608,000. (Including power house and distribution system $1,400,000.) Failed April 7,1900, with 11.07 ft of water over crest. See paper No. 40 of Water Supply & Irrigation Papers of U. S. Geological Survey.
Overflow dam - curved on radius of 300 ft.
Rubble in Portland cement mortar contracted at $10.30 per cu. yd. which included excavation but not cement. Used 31,500 barrels of cement, cost $4.50 per barrel. Has passed 12 ft. depth of water.
Fig. 60. Section of La Grange dam, California; built 1891 to 1894; rubble masonry; length 320 ft.; height 127.5 ft.; contains 39,500 cu. yd.
Built on several tangents, reinforced by heavy buttresses at the angles.
Height above river bed 98 ft.
Waste weir 1453 ft. long, 11 ft below remainder of dam.
Fig. 61. Section of Poona dam, India; rubble masonry; length 5136 ft; height 108 ft.; contains 360,000 cu. yd.
Built heavy enough to permit being raised 17 ft. Small amount of Portland cement used, though chiefly built with hydraulic lime mortar burned at dam site.
Fig. 62. Section of Tansa dam, India; built 1886 to 1891; rubble masonry; length 8800 ft.; height 118 ft; contains 408,520 cu. yd.
Excavation in places 45 ft. deep. Principal items of work were:
251,127 cu. yd.
Loose rubble stone.......
544,700 cu. yd.
122,555 cu. yd.
408,520 cu. yd.
Proportion of mortar in rubble masonry = 36.7 per cent. Maximum progress during month of January, 1891 when 700 masons laid 26,000 cu. yd. of rubble. Built macadamized road, 8 miles from nearest railroad station. Total cost $988,000.