The EGE
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The small building along the riverbank - the Fens Gate-house - is still there today. It was built in 1909 when the Charles River Dam was constructed, which changed the Charles River Basin from saltwater to freshwater. A new conduit was built along the riverbank to carry (most of) the often-polluted Stony Brook flow to below the dam, with the gatehouse as the connection point. Construction of separate storm drains in the early 21st century vastly reduced the amount of polluted runoff in the Stony Brook, so the portion that flows into the Charles isn't an issue.