In about 1910, the Northern Pacific Railroad built a bascule bridge in one of its railroad trestles. In this kind of bridge, a large weight is used as a counterbalance. When the weight is pulled downwards, the span of the bridge tilts upwards so that boats can pass underneath.
<p>In this photo, scaffolding supports the large weight while the railroad bridge is being built.
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<ul><li>Subjects (LCTGM): Northern Pacific Railroad Company; Railroad bridges</li></ul>
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Webster &amp; Stevens</div>
<a rel="nofollow" class="external text" href="https://digitalcollections.lib.washington.edu/digital/collection/imlsmohai/search">Museum of History and Industry</a>