The Annisquam River is a tidal, salt-water estuary in the Annisquam neighborhood of Gloucester, Massachusetts, connecting Annisquam Harbor on the north to on the south. The segment between Gloucester Harbor and the Newburyport/Rockport Line bridge is also known as the Blynman Canal. There are only three fixed crossings of the river: Massachusetts Route 128, the Rockport Branch of the MBTA Newburyport/Rockport Line, and Western Avenue (Massachusetts Route 127). There are strong tidal currents in the river, and unusually the current flows in opposite directions at the two ends.