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Charting project reveals Charles River’s depths

A new chart of the Charles River basin created by MIT and the Charles River Alliance of Boaters. MIT Sea Grant College / Charles River Alliance of Boaters

The Charles River Basin — at least, the one we recognize — was born on Oct. 20, 1908.

Before then, much of the waterway between Boston and Cambridge was an estuary, with expansive, foul-smelling mud flats emerging at low tide. But on that Tuesday more than a century ago, workers on the first dam at the mouth of the Charles lowered 84 massive timber gates into the water, creating the placid, lake-like river so familiar today.

Now, for the first time since it was submerged, the riverbed is coming back into view, this time in vivid digital detail. A Massachusetts Institute of Technology engineer and a longtime sailor and scientist have collaborated to create the most thorough, accurate chart of the lower Charles yet. It promises to become a foundational tool of multiple efforts to study, navigate, and manage the increasingly crowded Charles.

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