Watercolor Rendering of Cabin John Bridge Scaffolding, Washington Aqueduct. Captain M.C. Meigs, Chief Engineer; Alfred L. Rives, Assistant Engineer, Delineator. (Also called <a href="https://en.wikipedia.org/wiki/Union_Arch_Bridge" class="extiw" title="wikipedia:Union Arch Bridge">Union Arch Bridge</a>. Location: Cabin John, Maryland.) Archived by U.S. National Park Service, Historic American Engineering Record.
<a href="https://en.wikipedia.org/wiki/United_States_Army_Corps_of_Engineers" class="extiw" title="wikipedia:United States Army Corps of Engineers">U.S. Army Corps of Engineers</a>. Alfred L. Rives, Assistant Engineer, Delineator.
1859-11-30
This image  is available from the United States <a href="//commons.wikimedia.org/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a>'s <a rel="nofollow" class="external text" href="//www.loc.gov/rr/print/">Prints and Photographs division</a><br> under the digital ID <a rel="nofollow" class="external text" href="http://hdl.loc.gov/loc.pnp/hhh.md0255">hhh.md0255</a>.<br><small>This tag does not indicate the copyright status of the attached work. <span style="white-space:nowrap">A normal <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Copyright_tags" title="Special:MyLanguage/Commons:Copyright tags">copyright tag</a> is still required.</span> <span style="white-space:nowrap">See <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Licensing" title="Special:MyLanguage/Commons:Licensing">Commons:Licensing</a>.</span></small>