. Concrete bridges and culverts, for both railroads and highways . 2 Portals:—Concrete 88 yds. ^ $$7U4 Barrel per Un ft. Steel 240 lbs. @ .04= _9^ $ Length for 20 ft. Baiik=32 feet. Area = 161 sq. ft. Cost = $2570. the thickness of the culvert top. Culverts similar tothis have been used by the Illinois Central RaihvayCompany. Figure 51 is a concrete box culvert with rod rein-forcement similar to Figure 58, excepting that init offset footings and cobble stone pavement areused instead of a reinforced concrete pavement slab. 222 COXCRETE BRIDGES AXD CCLJERTS.

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