The Ballard Locks near Seattle, when they were drained for maintenance…
maintenance
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The Ballard Locks (a.k.a. the Hiram M. Chittenden Locks) are used to allow ships to travel between Lake Washington and Puget Sound. They are needed because the water level of the lake is higher than Puget Sound – about 26 feet higher at low tide. Maintenance work was being done on the smaller of the two locks so I took the opportunity to get some pictures.