One of Alexandria’s most remarkable examples of in situ preservation involved the restoration of the tide lock of the Alexandria Canal in 1985. Excavated and reconstructed by industrial archaeologist Tom Hahn and Emory Kemp, the lock was featured in Savage/Fogarty Real Estate, Inc.’s design for their Trans-Potomac Canal Center development. Today, the original Tide Lock No. 4 is protected beneath an accurate reconstruction.