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Through Truss
bridges are common, and easy to see because the traffic load, (that's you), is carried on the bottom chord with truss sections on each side. They come in a variety of sizes, from short pony trusses to spans exceeding 100 feet; and they can usually be prefabricated and assembled at the site. Several trusses in New Mexico have been moved, after years of service, to new locations.
 | One of the earliest examples of an "engineered" bridge, the Pratt Through Truss was often reused for new applications. It is lightweight, easy to erect, and seldom collapses. Look for a diagonal in-between the uprights. |
| The Parker Through Truss is a variation of Pratt. The polygonal top chord allows for better stress and bending distribution than the standard Pratt type. Look for a diagonal in-between the uprights, and an angled top chord. |
| Warren Through Truss bridges are sturdy and versatile. Diagonal members can be used in either compression or tension, and uprights can be added to strengthen the truss. Look for the big "W" |
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