The Canterbury Brook emerges from an old tunnel under Harvard Street on the former State Hospital property. Seth Daniel photo

Mattapan’s Canterbury Brook might as well be the Loch Ness Monster. Few have actually seen it, no one is quite sure if it’s real, and it disappears right after it appears.

Officially owned by the state Department of Capital Assets Maintenance and Management (DCAMM), the Brook has seen better days, but its meandering underground and above-ground channel could become a critical piece in efforts to setup stormwater mitigation for a large portion of Mattapan.

That is why the Charles River Watershed Association (CRWA) has set its spotlight on the Brook in a push to restore the waterway and maybe end some of the flooding woes area residents have identified.

“The Cante

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