Keywords: Seneca Aqueduct on Chesapeake and Ohio Canal before collapse from HABS.tif en Photo of the Seneca Aqueduct No 1 before the upstream arch collapsed HABS says 1 Historic American Buildings Survey John O Brostrup Photographer September 16 1936 11 35 A M VIEW OF AQUEDUCT FROM SOUTHEAST - Chesapeake Ohio Canal Aqueduct No 1 Riley's Lock Road Vicinity State Route 190 Seneca Montgomery County MD http //www loc gov/pictures/item/md0872 photos 082761p/ LOC-image hhh md0872 Historic American Buildings Survey 1936-09-16 MD-57-B 39 07861 -77 33944 Seneca Aqueduct |