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Mining raw aggregate at the Brett Gravel Pit with power shovel and conveyor system.
1938-03-16
2024-11-24 |
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At the contractor's sand classifier and dewaterer discharges the sand fraction to a conveyor belt.
1938-08-26
2024-11-24 |
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The Dorr hydro-separator installation at the contractor's sand classifier plant.
1938-08-26
2024-11-24 |
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At Consolidated Builders' sand classifier plant, the Toledo scale, with chronoflow recording attachment, weighs the quantity of sand produced. Each of the three scales is attached to a conveyor belt which carries sand of one size range.
1938-08-26
2024-11-24 |
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The contractor's main aggregate conveyor. Its capacity is rated at 2,750 tons per hour, and it is about 5,000 feet in length.
1938-09-21
2024-11-24 |
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The contractor's drain tile manufacturing plant. The 5-inch i.d. porous concrete drain tile is embedded in the "A" blocks of the dam to become a part of the extensive drainage system.
2024-11-24
2024-11-24 |
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The manufacture of 5-inch i.d. porous concrete drain tile. After the mold form is filled with compacted concrete, the core is withdrawn and within a few minutes the mold form is removed. A 5-man crew makes an average of 242 tile in an 8-hour...
2024-11-24
2024-11-24 |
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The completed construction deck for the left powerhouse erection. The lower end of the inclined concrete transfer skipway is also visible.
2024-12-24
2024-11-24 |
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The inclined double-track, concrete transfer skip for lowering concrete from the elevation 1180 construction trestle to the left power house construction deck at elevation 1015. This structure clears the downstream face of the dam, and will not be...
1938-11-22
2024-11-24 |
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Consolidated Builders' main water supply pumping station.
1938-09-16
2024-11-24 |
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The new high school building at Mason City, erected by Consolidated Builders, Inc.
1938-12-09
2024-11-24 |
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The gymnasium building, erected by Consolidated Builders, Inc. at Mead Circle Park in Mason City.
1938-12-09
2024-11-24 |
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Consolidated Builders, Inc. remodel the Mason City hotel and coffee shop.
2024-11-24
2024-11-24 |
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The 1938 flood waters top the spillway "A" blocks at elevation 975 and overflow the blockouts recesses prepared for future installation of the elevation 934 outlet works.
1938-05-28
2024-11-24 |
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The temporary fish ladder provided at block 62 for the passage of migratory fish during the 1938 season.
1938-04-11
2024-11-24 |
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The block 62 fishway, showing the derrick used for adjusting the fish ladder weirs. The weirs were adjusted as required by changes in the flow of the river.
1938-05-09
2024-11-24 |
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The upstream side of a 70-ton closure gate used for river diversion purposes. The lower enclosed section of the gate was made into water tight compartments
1938-08-04
2024-11-24 |
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The downstream side of a 70-ton closure gate, and a gate guide frame. The contractor ordered eight gates and nine frames. They were fabricated by Pacific Car & Foundry Co. and assembled on the dam.
1938-08-04
2024-11-24 |
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A 70-ton all-steel closure gate is completed and lowered to a transfer barge. It will be used to close river diversion channels while they are built up. On the dam, fabrication of another gate is in progress.
1938-09-23
2024-11-24 |
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A closure gate moves slowly into position. When rollers of the gate are placed against the roller path guide frame (the truss of which is visible); the derrick will lower the gate, thereby cutting off the river flow through this diversion channel....
2024-12-24
2024-11-24 |
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Closure gate slides into position. The truss supports the roller path guide frame down which the gate slides to its final position. The gate is lowered very slowly in order to prevent excessive fluctuations in the river surface levels below the dam.
1938-12-05
2024-11-24 |
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All-steel closure gates in place at spillway diversion channels Nos. 34, 36, and 38. The gates were placed on the upstream side of the dam only; the bottoms of the diversion channels were above the tailwater elevations, consequently gates were not...
1938-10-13
2024-11-24 |
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Foundation excavation nearing completion on the right abutment at the dam, above elevation 1024.
1938-05-26
2024-11-24 |
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Excavation is started at the pumping plant foundation. The material to be removed is located in general between el. 1170 and el. 1280. The concrete in that portion of the dam shown on the right has reached an average elevation of 1000.
1938-05-19
2024-11-24 |
