Tidewater Lock

The Tidewater Lock is a dam^[1] in Washington, D.C., west of the mouth of Rock Creek at the Potomac River, on the east side of Georgetown. Built to connect the Potomac and the Chesapeake and Ohio Canal, opened in 1831, it was a busy maritime intersection during several decades of the canal's heyday. C&O documents refer to it as Lock 0 or Tide Lock A. Today, the lock marks Milestone 0 of the National Park Service's Chesapeake & Ohio Canal trail.^[2]

Tidewater Lock
38.8999°N 77.0578°W / 38.8999; -77.0578
Waterway	Chesapeake and Ohio Canal
Country	USA
State	Washington, D.C.
Operation	Defunct
Length	54 m
Width	4 m

Canal documents sometimes list a "Tide Lock B" on section "I", completed in 1834 by the lockhouse at 17th and Constitution Ave NW.^[3]

Gallery

• 
  View of downstream gate pocket where the canal joins the Potomac River
• 
  Ruins of the waste weir, which adjoins the Tidewater lock
• 
  Tidewater lock, with the Watergate complex in the background

See also

• Locks on the C&O Canal