The Hills Governors Island: West 8's 70-Foot Rubble Engineering & Harbor Horizons

1. Introduction: Sculpting the Flat Horizon

For centuries, Governors Island was defined by a low, table-flat topography. The northern 69 acres represented the island's natural colonial footprint—a gentle drumlin of glacial till crowned by Fort Jay and Castle Williams. The southern 103 acres, however, were entirely artificial: a pancake-flat expanse of landfill created between 1901 and 1912 using 4.7 million cubic yards of earth and rock excavated during the construction of the Lexington Avenue subway line.

When the federal government transferred the island to New York in 2003, this southern sector was a windswept wasteland of abandoned military barracks, parking lots, and cracked asphalt runways. In 2016, that blank slate was radically transformed with the completion of The Hills—a ten-acre public park featuring four sculpted green mounds that rise up to 70 feet above sea level.

Conceived by renowned Rotterdam-based landscape architecture firm West 8, The Hills represent one of the most audacious feats of 21st-century civil and landscape engineering in New York Harbor. By introducing dramatic verticality to a flat marine landscape, the project created unforgettable public vantage points while providing vital structural defense against climate change and coastal storm surges.

2. West 8 & The Topographic Vision of Adriaan Geuze

In 2006, the Trust for Governors Island launched an international design competition to master-plan the island's open spaces. The winning entry by West 8, led by visionary Dutch landscape architect Adriaan Geuze, proposed a radical intervention: rather than honoring the island's flat industrial grade, the park should construct artificial topography inspired by the dramatic natural terrain of ancient Manhattan.

Geuze recognized that human beings naturally seek elevation to orient themselves within a vast maritime territory. By raising the grade by 70 feet, visitors would be lifted above the canopy of surrounding trees, bringing New York Harbor, the Statue of Liberty, Brooklyn Heights, and the Financial District skyscraper skyline into breathtaking theatrical alignment.

Furthermore, Geuze designed the slopes with sinuous, organic contours that guide pedestrians through carefully curated spatial sequences: intimate winding forest paths suddenly open into dramatic cantilevered viewing overlooks that frame passing container ships and tugboats.

3. Geotechnical Earthworks: 290,000 Cubic Yards of Recycled Debris

Constructing 70-foot-high earthen hills over unconsolidated 20th-century marine landfill presents profound geotechnical challenges. If solid dense soil had been piled directly onto the existing grade, the massive surcharge load would have triggered severe subsoil settlement, lateral spread, and slope failures into the East River and Buttermilk Channel.

Working in partnership with structural and civil engineering firm Magnusson Klemencic Associates (MKA), West 8 devised a brilliantly sustainable circular engineering solution:

• Recycled Concrete Cores: Over thirty obsolete Coast Guard residential apartment buildings and parking lots on the island were systematically demolished. Instead of barging the debris to distant landfills, workers crushed 290,000 cubic yards of concrete, brick, and masonry on-site, using it as the core fill material for the hills.
• Lightweight Pumice Aggregate: To minimize downward bearing pressure on soft underlying estuarine silts, engineers blended lightweight volcanic pumice aggregate into the upper structural fill layers, slashing the embankment's dead weight by nearly 40%.
• Geotextile Geogrid Stabilization: High-tensile polymeric geogrids were laid in horizontal tiers every two to three feet throughout the slope profiles, locking the granular fill into a cohesive, earthquake- and wind-resistant reinforced soil mass.
• Living Topsoil Mantle: The slopes were capped with an engineered topsoil mix (sand, compost, expanded shale) planted with over 860 trees and 41,000 coastal shrubs whose deep root matrices permanently bind the surface against erosion.

4. The Anatomy of the Four Hills

The park comprises four distinct peaks, each calibrated for specific recreational, sensory, and communal programs:

5. Outlook Hill Granite Scramble & Harbor Panoramas

Ascending to the summit of Outlook Hill is the defining ritual of visiting Governors Island. While gentle ADA-accessible switchback pathways allow strollers and wheelchairs to reach the peak, adventurous visitors can climb the dramatic Granite Scramble.

Constructed from massive blocks of quarried Maine granite salvaged during the reconstruction of the island’s historic seawall, the scramble forms an enormous naturalistic stone staircase. Scaling the boulders requires active balance and engagement, rewarding climbers at the 70-foot apex with an awe-inspiring visual revelation:

• The Statue of Liberty: Positioned directly across Upper New York Bay, providing the most dramatic, unobstructed eye-level vantage point of Lady Liberty anywhere in the city.
• Lower Manhattan Financial Core: Soaring views across the harbor toward 33 Thomas Street, 8 Spruce Street, and the East River skyline.
• New York Harbor Convergence: Watch ocean container vessels glide past Staten Island, tugboats navigate Buttermilk Channel, and NYC Ferries trace white wakes across deep blue water.

6. Sea-Level Rise Defense & Storm Surge Attenuation

Beyond its aesthetic and recreational triumph, The Hills operate as a vital piece of resilient green infrastructure. When Superstorm Sandy struck in October 2012, salt-water storm surge submerged the southern tip of Governors Island, demonstrating that flat topography was acutely vulnerable to catastrophic flooding.

West 8 elevated the primary grade of the park well above the 100-year and 500-year flood levels established by FEMA. The sculpted earthen embankments function as a protective physical buffer, dissipating the kinetic energy of Atlantic storm waves before they can breach interior park facilities or historic military structures.

Salt-tolerant botanical species—such as black tupelo, honey locust, and pitch pine—were specifically chosen to withstand coastal wind shear and brackish aerosol. The Hills stand as an international model for how coastal cities can convert post-industrial waste into resilient urban topography that protects communities while elevating civic life.

7. Geotechnical Monitoring & Rachel Whiteread's Cabin

Because The Hills rest on an unengineered 20th-century dredge-fill foundation, geotechnical engineers installed an extensive subterranean telemetry array during construction. Over forty vibrating wire piezometers, settlement monitoring plates, and vertical inclinometer casings were driven into the underlying stratigraphy to measure pore water pressure and lateral soil displacement in real time as the 290,000 cubic yards of fill were deposited.

Engineers utilized a phased surcharge protocol: large temporary mounds of excess fill were staged atop Outlook Hill for nine months, accelerating primary consolidation settlement of the saturated estuarine clays before final grading and path construction commenced. This preventive surcharge technique prevented post-construction differential settlement that could have cracked pedestrian switchbacks or damaged drainage conduits.

Nestled within the dense forested canopy of Discovery Hill sits Rachel Whiteread's haunting permanent sculpture, Cabin. To install this massive concrete monument—cast from the interior volume of an authentic wooden shed—engineers drove dedicated steel micro-piles through the fill matrix into stable bearing strata. Surrounded by bronze casts of discarded refuse (bottles, tin cans) scattered among the undergrowth, the installation serves as an evocative poetic meditation on memory, shelter, and post-military renewal.