Pennsylvania Avenue Bridge
... that the original configuration of the Pennsylvania Avenue Bridge in Washington, D.C., used operational water mains as its principal load-bearing arches?
... that the original configuration of the <b id="mwBA8"><a href="./Pennsylvania_Avenue_Bridge" id="mwBBA" rel="mw:WikiLink" title="Pennsylvania Avenue Bridge">Pennsylvania Avenue Bridge</a></b> in Washington, D.C., used operational water mains as its principal load-bearing arches?