num_pages: 238
description: This study covers bridges built in the United States through 1955, up to the year of the passage of the Federal Aid Highway Act of 1956, which created the Interstate Highway System. It is intended to provide assistance with assessing the historic significance of bridge types within the context of the U.S., and can improve the significance evaluation process through providing a picture of the bridge types that are very common and those that are much less common, as well as providing an assessment of the technological and historical significance of the individual types. The study does not address one-of-a-kind and other rare historic bridges.
language: English
title: A Context for Common Historic Bridge Types
publisher: National Cooperative Highway Research Program