These city scale pergolas are part of the North End Parks, the first parks built over Boston's Big Dig.

I was hired as a consultant by Crosby Schlessinger Smallridge in Boston for the landscape architecture firm Gustafson Guthrie Nichol in Seattle, to develop the constructability & details of the already established pergolas. This included studies in overall geometry, layout & density, material changes (bronze to painted steel), thinning out the structure (from tube to plate members), integrating lighting & electrical outlets, adding supports for plant growth, coordinating with the Big Dig tunnels below (removable parts, location of footings), and creating a pigeon-free environment. Through consulting with metal fabricators, I brought the project within budget. I also contributed to the design of the railing, the paving and in selecting the stone in the rest of the park.

U.N.O., the photos are by yours truly as are the drawings, though those belong to C.S.S.

Rendering by Neoscape.
Park plan by GGN.
Rendering by Neoscape.
Big Dig tunnel plan by MTA.
Rendering by Neoscape.
Big Dig electrical plan by MTA.
Rendering by GGN.
Rendering by GGN.
ABOVE & TO THE RIGHT: A very few of the construction drawings and sketches of the pergolas >>>
Pergola 1 is 128 ft long x 15-26 ft wide. Pergola 2 is 90 ft long x 30-36 ft wide. Pergola 3 is 210 ft long x 28-40 ft wide.
Due to the splayed out curvature, varying widths, ascending, descending, increasing & decreasing rhythm, every one of the 87 purlins (the upside down L's) is of a different height & length and connects at different points to the beam.
To help the metal fabricator price & build them correctly, each one is drawn out in shop-drawing fashion. It is this level of customization that affects the cost.
A view at underground Big Dig obstacles. The pergola arrays elegantly and evenly but that array was carefully achieved so that footings don’t fall on anything that cannot be touched. Part of the pergola had to be made removable for specific vault & tunnel repair access and some footings cantilever.
ABOVE & TO THE RIGHT: Stone selection and paving design >>>
Paving plan by CSS team.
ABOVE & TO THE RIGHT: Groundbreaking (Can you spot Senator Kennedy? Yes, this was a Big Deal project) & Construction >>>
(Invitation by MTA, photos by Kaki Martin except fountain reinforcement by yours truly.)
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