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The elevation 1024 trestle, used by the M.W.A.K. Company, is dismantled. the structural steel was incorporated in the new construction trestle erected to elevation 1180.
1938-05-19
2024-11-24 |
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The elevation 1024 construction trestle, used by the M.W.A.K. Company, was dismantled by the new contractor.
1938-05-10
2024-11-24 |
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One of the large steel plate girders used in the construction of the elevation 1180 trestle. This girder, consisting of 18" cover plates and 100" web plate, weighs 38 ton, and is about 100 feet long.
1938-07-29
2024-11-24 |
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Steel erection on the right abutment for the new construction trestle, with deck at el. 1180. At the bottom are a few remaining timbers of the trestle at el. 1024, which was used during the MWAK Co. contract.
1938-06-28
2024-11-24 |
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Erection in progress on the el. 1180 construction trestle. The tugboat and barge in the foreground have just been brought from the downstream side of the dam through the diversion channel.
2024-08-24
2024-11-24 |
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The construction trestle, with deck at el. 1180, approaches the spillway section of the dam. The Bethlehem Steel Co. under subcontract from Consolidated Builders, furnished the structural steel, and erected the trestle.
1938-08-02
2024-11-24 |
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Erected from the east and west shores, the elevation 1180 construction trestle is joined together over the spillway section of the dam. A total of 8,900 tons of structural steel was used in this trestle.
1938-09-10
2024-11-24 |
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Erection in progress on a large Colby hammerhead crane, as well as on the elevation 1180 construction trestle. When completed, this crane will measure 356 feet from tip to tip of the boom, and will weigh 268 tons.
1938-07-25
2024-11-24 |
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Erection in progress on a Colby hammerhead or double-cantilever gantry crane. This picture shows the completed framework of one crane, and erection started on a second unit.
1938-08-19
2024-11-24 |
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Trestle cranes Nos. 1 to 4, inclusive. Altogether, there are ten cranes on the 1180 elevation construction trestle.
1938-08-22
2024-11-24 |
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Consolidated Builders, Inc. installed one-man controls on the concrete trains. In addition to hook tender duties, the workman operates the train from any one of six control stations on the bridge deck of the bucket car.
2024-12-24
2024-11-24 |
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A monorail hoist and concrete transfer chute used for pouring concrete inside a supporting tower of the elevation 1180 construction trestle.
1938-11-21
2024-11-24 |
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Consolidated Builders' railroad car transfer-skip. Built on the left abutment of the dam, this inclined skipway lowers or raises railroad cars between the U.S. Construction Railroad at elevation 1310 and the trestle deck at elevation 1180.
1938-11-18
2024-11-24 |
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Building the foundations for the new mixing plant location at el. 1180, downstream from the right abutment of the dam.
1938-05-23
2024-11-24 |
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Building the foundations for the new mixing plant setup at el. 1180. The old MWAK Co. Eastmix plant at el. 1024 is on the right, and in the background the dismantling and removal of the el. 1024 construction trestle is in progress.
1938-05-26
2024-11-24 |
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Erection of the mixing plants at the new location on the east side of the dam. In the right foreground is the old Eastmix used by Mason-Walsh-Atkinson-Kier Company.
1938-06-28
2024-11-24 |
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The twin mix plant was erected downstream from the right abutment of the dam at the el. 1180 level.
1938-07-09
2024-11-24 |
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Steel erection in progress for the new mixing plants showing the twin set-up at the 1180 level.
1938-07-25
2024-11-24 |
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Construction in progress on the el. 1180 mix plant, the incline aggregate conveyors, and the el. 1180 construction trestle. The workmen in the foreground are pouring footing piers for a warehouse and shop building.
1938-07-26
2024-11-24 |
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The completed concrete mixing plant at the east end of the elevation 1180 construction trestle. The inclined truss structure supports the cement delivery pipeline which extends to the unloading and blending plant on the far side of the Columbia...
2024-11-24
2024-11-24 |
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Automatic aggregate weighing batchers at the concrete mixing plants. After the aggregate is weighed, it is dumped into the mixers which are one the floor directly below.
1938-12-28
2024-11-24 |
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The large Fuller Kinyon cement unloading machine. Bulk cement is received in box cars, and is rapidly unloaded to the cement storage silos by means of this machine.
1938-12-30
2024-11-24 |
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The Brett Gravel Pit, and the gravel processing plant. The huge sand pile, estimated at 4,000,000 cubic yards, is the surplus sand which has been wasted here after the gravel and cobbles were removed. In the foreground is the Mason City Airport.
1938-04-25
2024-11-24 |
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The elevation 1650 level of the Brett Gravel Pit is opened up for the mining of raw aggregate.
1938-05-24
2024-11-24 |
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Caterpillar tractor and 16-wheeled buggy haul raw aggregate at the Brett Gravel Pit. This method of aggregate transportation was used prior to installation of conveyor system.
1938-10-07
2024-11-24 |
