Black Rock Dam

Black Rock Dam - Credit: Wikimedia Commons

The Black Rock Dam is a low head dam in the Schuylkill River. Originally constructed as a stone filled, timber crib dam in the early 19th century by the Schuylkill Navigation Company, the dam was one of dozens built to create a slack water pools for the Schuylkill Navigation System. The dam is a contributing property of the "Schuylkill Navigation Canal, Oakes Reach Section" registered historic district. The dam is located between Phoenixville and Mont Clare in southeastern Pennsylvania, USA. Read more on Wikipedia

type: dam
date from: 1825

Source: en.wikipedia.org