<p>Duck Bridge under repair.  The bridge carries Union Street over the Merrimack River.  A plaque visible at right indicates the bridge was built in 1888.  It reads:
</p><p>BOSTON
BRIDGE WORKS
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BUILDERS
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1888
G.L. VOSE
</p>
CONSULTING ENGINEER
<a href="//commons.wikimedia.org/wiki/User:Emw" title="User:Emw">Emw</a>
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<span class="int-own-work" lang="en">Own work</span>