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Photo: Matthew Peter-Davis, CC BY 4.0 via Wikimedia Commons
Built for use by the old Lawrence mills and factories. While it is no longer used today and portions of it have become contaminated with waste, the canal itself still has historic value. In addition, the canal is home to several beautiful historic bridges that once carried access roads to the factories. The canal is immune to filling in due to its heritage.
© OpenStreetMap contributors
The bridge is an historic through truss bridge carrying South Union Street over the Merrimack River in the middle of downtown Lawrence. The bridge, built by Boston Bridge Works in 1888, is one of the oldest surviving bridges on the Merrimack, despite being rehabilitated several times. The current structure has been closed to all traffic indefinitely due to safety concerns. However, the bridge could be re-opened after another rehab project, which has been delayed for about two years due to funding concerns.