Tidewater Lock

Tidewater Lock is a canal lock in Georgetown that connects the Chesapeake and Ohio Canal with the Potomac River and regulates water between different levels. The structure is about 54 meters long and 4 meters wide and stands as an example of 19th century engineering work.

The lock was completed in 1831 as part of the system for moving goods from the Potomac Valley inland. It played a central role in the region's economy during the early phase of American industrialization.

The adjacent lockhouse shows how canal keepers lived while managing water levels and maintaining operations for many decades. Visitors can see how closely these workers were connected to the daily function of the system.

The structure sits within the Chesapeake and Ohio Canal National Historical Park and is easily reached by walking paths. Visitors should wear sturdy shoes and allow time to explore the canal system and surroundings at a relaxed pace.

The structure is known as Milestone Zero of the National Park Service trail system and contains original engineering details like gate pockets and weirs. These features show the craftsmanship of early engineers and are often overlooked by casual visitors.

Location: Washington, D.C.

Length: 54 m

Width: 4 m

Part of: Chesapeake and Ohio Canal

GPS coordinates: 38.89956,-77.05748

Latest update: December 14, 2025 11:03