The Ballard Locks combine working ship locks with a fish ladder where migrating salmon can be viewed through underwater windows. It is a rare place where major engineering and animal migration are visible in the same stop.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: nws.usace.army.mil/Missions/Civil-Works/Locks-and-Dams/Chittenden-Locks/