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This is a list of the crossings of the Charles River from its mouth at Boston Harbor upstream to its source at Echo Lake (the four tunnels crossing the inner portion of Boston Harbor are not included). All locations are in Massachusetts.
Map of Charles River, Massachusetts, USA
Source: Echo Lake 42.193012°N 71.5119°W / 42.193012; -71.5119 (Echo Lake (river source))
References
List of crossings of the Charles River Wikipedia(Text) CC BY-SA