High Line, Phase 2
 Information Partner  
On the Philip A. and Lisa Maria Falcone Flyover on the High Line's Phase 2 on February 18, 2012; Photo Courtesy of and ©Steven L. Cantor.Project Name: High Line, Phase 2
Year: 2011
Owner: City of New York
Location: New York, NY, USA
Building Type: Park
Type: Intensive
System: Custom
Size: 87120 sq.ft.
Slope: 1%
Access: Accessible, Open to Public
Submitted by: Greenroofs.com

Designers/Manufacturers of Record:
Landscape Architect: James Corner Field Operations
Architect: Diller Scofidio + Renfro
Planting Design: Piet Oudolf
Engineering: Buro Happold
Greenroof System: ZinCo USA
Greenroof Installation: Kelco Landscaping
General Contractor: KiSKA Construction
Construction Management: SiteWorks Landscape & Bovis Lend Lease
Aerial of the Woodland Flyover on the High Line's Phase 2 on July 4, 2011; Photo Courtesy of and ©Steven L. Cantor.Close-up on the Woodland Flyover on the High Line's Phase 2 on June 10, 2011; Photo Courtesy of and ©Steven L. Cantor.On the High Line on June 16, 2011; Photo Courtesy of and ©Steven L. Cantor.
An ambitious and highly acclaimed urban reclamation project, the High Line is noted for its innovative design, sustainability, and adaptive reuse of the Art Deco masterpiece with its layers of steel beams, rivets, and guardrails into a beloved public park. Located in the Chelsea neighborhood of Manhattan, the length of the High Line traverses 23 uninterrupted city blocks, 30 feet in the air, with expansive views of New York City and the Hudson River. At a total of 2.4 km, 1.45 miles, or 7,874.02 linear feet, the High Line is considered the "longest greenroof" in the world to date (as of 2015) with an approximate total area of 300,313 square feet or 2.79 ha. Since the width of the High Line varies from about 33 feet to 66 feet, or 10 meters to 20 meters (ZinCo, 2015), the area for each phase is estimated.

Designed by the landscape architecture firm of James Corner Field Operations (whose mantra throughout the design process was 'Keep it Simple, Keep it Wild, Keep it Slow, and Keep it Quiet) and architects Diller Scofidio + Renfro with planting design from Piet Oudolf and engineering design by Buro Happold. The High Line was created in three phases over a period of eight years with each section measuring about .5 miles: Construction started in 2006 and Phase 1 covering 9 blocks opened in 2009; Phase 2 covering 10 blocks opened in 2011; and Phase 3 started in 2012 and was opened to the public in 2014. Although the High Line is one continuous project, the profiles here are presented as a series of three since they were constructed over different time periods with distinct features. See the profiles for Phase 1 and Phase 3.

Located in New York City's Meatpacking District, the High Line was an elevated railway originally constructed in the 1930s to lift dangerous freight trains off Manhattan's expanding streets; abandoned in 1980, it was left to naturalize and fell into disuse. The non-profit group "Friends of the High Line" was founded by Joshua David and Robert Hammond in 1999 to advocate for its preservation and reuse as a public park. In 2002, Friends of the High Line finally won a lawsuit challenging the City's plans for demolishing the remaining tracks. In 2003 a design competition was launched to solicit proposals for reusing the High Line.

Today the High Line is an elevated public park owned by the City of New York and operated under the jurisdiction of the New York City Department of Parks & Recreation. The first section opened to the public in June, 2009. The second phase extended the High Line from 20th Street to 30th Street, opening in June, 2011. Phase 2 added public access points at 23rd, 28th, and 30th Streets, as well as ADA-accessible elevators at both 23rd Street and 30th Street.

Distinct features found in the High Line, Phase 2 are the Chelsea Thicket; Wildflower Field; 23rd Street Lawn; Philip A. and Lisa Maria Falcone Flyover; and the 26th Street Viewing Spur. See a map and these Park features in detail at
Friends of the High Line.

Section 2 is "narrower and straighter, bounded on both sides by an eclectic mix of historic warehouses, residential buildings and new development. The scale is much more intimate, intense, even voyeuristic, creating a feeling of being more removed from the big city and more immersed in the neighborhood," (Read the entire profile from the
ASLA, 2013).
Looking through the 26th Street Viewing Spur on the High Line on June 19, 2011; Photo Courtesy of and ©Steven L. Cantor.On the High Line on July 16, 2011; Photo Courtesy of and ©Steven L. Cantor.
"The second phase route runs parallel to Tenth Avenue, one of the principal north-south traffic arteries. The corridor is less variable in width and often narrower than in the first phase. The second phase route is also farther from the Hudson River, which forms a dramatic backdrop to some of the first phase design. About one third of the second phase is elevated about 8 feet (2.5 meters) above the planting beds below, so that pedestrians walk on a metal structure called the Philip A. and Lisa Maria Falcone Flyover. Its alignment is gracefully off center, resulting in planting beds on the east side that are about three times wider than those on the west.

"Except for some tree species, such as magnolias, amelanchier and sassafras still becoming established, visitors look down on the vegetation rather than see it at eye level. As the vegetation has grown, the effect is of walking through the upper story of a young forest, and descending back to the "forest floor" as either end of the skyway meets the existing elevation of the trestle," (Cantor, 2013).

ZinCo USA provided the technical basis for all the green roof design concepts in terms of plants, walkways, and leisure areas. Floradrain® drainage elements were installed on the sealed concrete surface. These profiled elements have troughs on the upper side for retaining precipitation. Excess water is safely drawn off through the channel system on the underside. The Floradrain® elements were installed across the entire area, filled with the ZinCoblend M growing medium, and then covered with a filter sheet, followed by the vegetation layer. The existing water and electricity supply lines were integrated into the build-up.

"With the help of ZinCo USA green roof technology, the High Line now invites the public to stroll above 10th Avenue on its 1-mile-and-a-half boardwalk among natural plantings, benches, lighting and a host of special features. The ZinCo USA drainage system enabled the High Line's diverse array of design and construction experts to seamlessly integrate plantings with hardscapes. The components of the ZinCo USA system allow stormwater and irrigation runoff to drain properly while simultaneously retaining water to keep the vegetation vital and healthy. We feel the project epitomizes how green roof technology can transform urban space into beautiful recreational parks and gardens," (ZinCo USA, 2011).

The High Line has won many awards including the
2013 Honor Award for General Design for The High Line, Section 2 from the American Society of Landscape Architects (ASLA); 2011 Awards of Excellence from Green Roofs for Healthy Cities in the Intensive Institutional category; other awards on the long list include the 2010 International EGHN Award from the European Garden Heritage Network and the 2010 Honor Award for General Design for The High Line, Section 1 from the ASLA. Also in 2010, Friends of the High Line received the International Green Roof Association Green Roof Leadership Award 2010, presented to Dr. John H. Alschuler, Jr., and Robert Hammond and Joshua David, founders of Friends of the High Line, were awarded the "Jane Jacobs Medal" by the Rockefeller Foundation; the organization itself was given the "Doris C. Freedman Award."

According to
NYCEDC, the total estimated cost of all three phases is about $187.3 million. One of the most expensive parks ever constructed, the High Line is also one of Manhattan's most popular destinations and receives 5 million visitors per year. From an overgrown abandoned railroad trestle to a delightful changing panorama of self-seeded landscape and re-introduced indigenous vegetation, original and restored rails, and contemporary artwork to a wide variety places for relaxation and enjoyment, the iconic High Line and is dearly loved as a remarkable landscaped city park in the air.

Additional thumbnail photos:

Taking in the public art (Sarah Sze’s Still Life with Landscape – Model for a Habitat) on the High Line on June 16, 2011; Photo Courtesy of and ©Steven L. Cantor.One of the iconic benches on June 16, 2011; Photo Courtesy of and ©Steven L. Cantor.Walking through the 23rd Street Lawn on June 16, 2011; Photo Courtesy of and ©Steven L. Cantor.Close up of Foxtail lily, Eremurus stenophyllus, with Rudbeckia sp in foreground on June 12, 2011; Photo Courtesy of and ©Steven L. Cantor.On High Line's Phase 2 on May 23, 2015; Photo Courtesy of and ©ZinCo.
Friends of the High Line works in partnership with the City of New York to preserve and maintain the structure as an elevated public park. Visit the official High Line website; and specifically their About and Sustainable Practices pages. Watch the 3:25 High Line - Project of the Week 10/5/15 video from Greenroofs.com on the greenroofsTV channel on YouTube. Greenroofs.com Project of the Week video photo credits: All courtesy of ©Steven L. Cantor, Landscape Architect, New York and ©ZinCo except: The High Line in Manhattan, New York City at West 20th Street, looking downtown (south)" by Attribution-Share Alike 2.0 Generic license Beyond My Ken licensed under the Creative Commons Attribution-Share Alike Attribution-Share Alike 2.0 Generic license; the High Line route map by OpenStreetMap contributors, licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license; "Western Electric complex NYC 1936" by Unknown" under Public Domain; and the High Line Route Map from James Corner Field Operations via the ASLA, 2013.

Watch the excellent 56:49 video covering up to Phase 2 of the High Line
Great Museums: Elevated Thinking: The High Line in New York City by Great Museums, narrated by Susan Sarandon, published on June 18, 2014 on YouTube and the 5:09 video High Line Section 2 Construction Tour uploaded to YouTube on December 20, 2010 by Friends of the High Line. Read the project profile on Wikipedia and see Greenroofs.com Landscape Editor Steven L. Cantor's 14-part series A Comparison of the Three Phases of the High Line, New York City: A Landscape Architect and Photographer’s Perspective from 2013 - 2015.

Read the June 17, 2011 press release/case study from
ZinCo USA.

Learn about
ZinCo USA and ZinCo International in The Greenroof & Greenwall Directory.
 
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