Mill Brook originates at the Reservoir (known as the Res) on the Arlington-Lexington line. I happened to notice it, through the fence, while I was getting a propane tank filled at the Bar-B-Q Barn on Dudley St. in Arlington. Near there, it flows under Brattle St.
and behind the Mill Brook Apartments, where parked cars, it seems, have the best view of the brook.
Most of the brook doesn’t give such an impression of still being nature; much of it runs between vertical stone walls
or emerges from under pavement.
Where the outflow of the Res becomes Mill Brook, there is a backwater in which a marsh has grown up, in a low-lying area between the earthen dam of the Res and the parking lot of Drake Village (public housing for the elderly and disabled).
To me this felt the least humanly constructed of any part of Mill Brook I saw.
[for more, see Pro. Pei & the H2O #9]