Show BUILDING MANY BRIDGES on ton pacific to erect thirty on wyoming division salt lake feb S according to a report froma wyoming the engineering department of the union pacific is presently to be engaged in the work of bome thirty new steel bridged on the wyoming division of the road most of the new bridges will replace old frame structures two 01 the structures are unusually large one ts feet long spanning the platte river near lasaile south of cheyenne the other ie a foot bridge over the green river near the town of that name in the construction of the green river bridge there will be some interesting engineering work the present bridge has four oot spans while the new bridge a double track bacel structure will have nine 75 foot fithel girders this new bridge Is to be con ted in precisely the aadne place as the present structure without interfering with traffic over the road this will be accomplished by constructing a false tresie work under the present bridge and grau dally building up the foundations of the new structure then one of the present spans will be removed and the new span quickly in exerted so perfectly will these be baade to nt that this operation the tearing out of one great bridge and the putting in of another will not require over an hours time |