<page_title> Locks on the Chesapeake and Ohio Canal </page_title> <section_title> Guard locks </section_title> <table> <cell> 7 <col_header> Lock </col_header> </cell> <cell> 164 <col_header> Miles </col_header> </cell> <cell> Not built <col_header> Name </col_header> </cell> </table>
The guard lock #7 around mile 164 was never built.