CHAPTER XVII

.--METHODS AND COST OF CONSTRUCTING ARCH

AND GIRDER BRIDGES 363

Introduction--Centers--Mixing and Transporting Concrete; Cableway Plants; Car Plant for 4-Span Arch Bridge; Hoist and Car Plant for 21-Span Arch Viaduct; Traveling Derrick Plant for 4-Span Arch Bridge--Concrete Highway Bridges Green County, Iowa--Highway Girder Bridges--Molding Slabs for Girder Bridges--Connecticut Ave. Bridge, Washington, D. C--Arch Bridges, Elkhart, Ind.--Arch Bridge, Plainwell, Mich.--Five Span Arch Bridge--Arch Bridge, Grand Rapids, Mich.

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