Press Release | Washington, DC | October 21, 2020

Tidal Basin Ideas Lab Exhibition Unveils Proposals to Redesign the National Mall Tidal Basin by Leading Landscape Architects DLANDstudio, GGN, Hood Design Studio, James Corner Field Operations, and Reed Hilderbrand

Initiated by the National Trust for Historic Preservation and the Trust for the National Mall together with the National Park Service alongside civic partner Skidmore, Owings & Merrill (SOM), and American Express, the proposals respond to daily flooding and crumbling infrastructure that threaten the sustainability of Washington, D.C.’s 107-acre site.

Today, the Tidal Basin Ideas Lab unveiled proposals from five leading landscape architecture firms – DLANDstudio, GGN, Hood Design Studio, James Corner Field Operations, and Reed Hilderbrand – reimagining the future of Washington D.C.’s iconic Tidal Basin and National Mall, which is home to monuments including the Thomas Jefferson Memorial, Martin Luther King Jr. Memorial, Franklin Delano Roosevelt Memorial, and 3,000 cherry trees that serve as the backdrop for the National Cherry Blossom Festival each Spring. The proposals are presented in a museum-quality online exhibition, co-curated by Donald Albrecht and Thomas Mellins, that invites the public to explore the histories and challenges of the Tidal Basin, and share feedback on ideas for the evolution of this important part of America’s landscape.

The Tidal Basin Ideas Lab is an urgent call to action to address the historic site’s pressing need for critical repairs and improvements, including a crumbling sea wall and daily flooding, taking into consideration environment, culture and visitor experience. The project marks a critical juncture for the landscape of the nation’s capital, envisioning and reshaping a deeply symbolic and beloved public space that communicates the history, values, and aspirations of the country.

A partnership between the National Trust for Historic Preservation, Trust for the National Mall, and the National Park Service, alongside civic partner Skidmore, Owings & Merrill (SOM), the project aims to present viable solutions and exciting possibilities to save and reshape one of the country’s most significant landmarks. As civic partner, SOM helped to identify and engage the design firms, and assisted in establishing the intellectual framework and organizational structure for the project.

“As part of ‘America’s front yard’, the Tidal Basin is home to some of the most iconic landmarks and traditions in the nation’s capital,” said Katherine Malone-France, Chief Preservation Officer of the National Trust for Historic Preservation. “Yet current conditions do not do justice to a landscape of such significance. With this new digital exhibition, we are excited to share and engage the public with creative thinking from five of the best landscape architecture firms in the world. These ideas explore ways to sustain this cultural landscape and its richly layered meanings for generations to come. This isn’t preservation as usual: this is preservation as innovation.”

“Collaboration and creative solutions are necessary to ensure the National Mall is restored, enriched and preserved for future generations," said Catherine Townsend, President and CEO of the Trust for the National Mall. "The Tidal Basin Ideas Lab is an innovative way to bring together designers, stakeholders, and the public to imagine a new vision for the Tidal Basin and surrounding areas. As the leading non-profit, philanthropic partner of the National Park Service, we are thrilled to be part of this exchange of ideas to help reimagine a resilient future for this iconic public landscape.”

“We appreciate the hard work of the National Trust for Historic Preservation and the Trust for the National Mall in leading this Ideas Lab and look forward to seeing the creative solutions to protect the resources of the Tidal Basin and improve the experience of our visitors,” said Jeff Reinbold, superintendent of National Mall and Memorial Parks. “The ideas presented by these five prestigious landscape architecture studios address both the very immediate concerns of the area, while also pushing our thinking about how to respond to future changes in conditions.”

Collectively, the five design teams explored diverse responses to saving the Tidal Basin by creating innovative proposals with solutions such as reconfiguring the water's edge, relocating or replanting the iconic cherry trees, creating new pathways and elevated vantage points, and embracing the dynamic and ever-evolving nature of the tidal landscape. Each proposal examines the significance of the site, explores the various histories that have shaped it implicitly and explicitly, and grapples with issues fundamental to the preservation of complex cultural landscapes. As the exhibition’s co-curator Thomas Mellins notes, “The exhibition is being presented at a moment when the nation is grappling with thorny aspects of its own story, as well as with the question of who gets to write it.”

This exhibition precedes and supplements the National Park Service’s mandated environmental review, master planning, and detailed design that will ultimately lead to funding construction and implementation. “Unlike a design competition, which typically selects a winner with a conclusive master plan,” notes the exhibition’s co-curator Donald Albrecht, “the Ideas Lab comprises myriad bold concepts and promotes exchange between designers, stakeholders, and the public.”

The five design teams worked to create the comprehensive proposals that present the bold and holistic solutions at the core of the exhibition. Each firm reimagined the public space to meet the demands of a changing landscape, the public, and modern safety and accessibility needs, to create a bold, ambitious and integrated vision for the Tidal Basin. These design concepts include:

  • DLANDstudio proposes new physical and visual connections that will reorient the flow of visitors and create new pathways through the basin, including building a land bridge between the Jefferson Memorial and the White House; forming a jetty in the Potomac River off the Lincoln Memorial housing the relocated memorial to Martin Luther King, Jr.; and cultivating sponge park wetlands, a reflective weir and green security wall to protect upland monuments, landscapes, and museums.
  • GGN envisions a dynamic series of incremental changes that will adapt the site to the environmental challenges of the future and give rise to a new cultural aesthetic. Achieved over three stages between today and 2090, this adaptive plan will accommodate forecasted sea level rise and will integrate regional ecologies to bring an overdue, ecological point of view. Monuments will be adapted, protected, or relocated to ensure the national importance of this collective space.
  • James Corner Field Operations offers three potential ways to handle and mitigate rising water levels: (1) preserve the site with an escalated regimen of maintenance and engineering; (2) allow the site to flood, creating a landscape in which entropy is on display; or (3) balance preservation with the acceptance of future instability and climate change by treating the memorials as islands within the Tidal Basin.
  • Hood Design Studio proposes three “anthems”: “Tell the Truth!” seeks to replace romantic and baroque design with stories of perseverance and resiliency; “Let the Waters Be Free” restores narratives of how the wetlands were valued by indigenous and enslaved peoples; and “Invention: Making New Things” asks if the Tidal Basin can trigger a national ethic that centers on rebuilding our urban ecologies.
  • Reed Hilderbrand focuses on the influential 1902 McMillan Plan for the development of the Washington D.C. parks system and its monumental core, guided by the idea of creating a “Washington Commons” -- a vast complex of recreational facilities. Encouraging a variety of experiences, the plan features three pathways: an uplands Cherry Walk, where the cherished trees will be relocated, a Memorial Walk, and a Marsh Walk. A new land form, Independence Rise, accommodates rising water levels, while a pedestrian bridge connects back to the city.

“The caliber of the thinking and quality of the ideas presented is a testament to the creativity and commitment of these world-class firms” said Keith O'Connor, Director of Urban Design and Planning at SOM. "As a collective body of work, these provocations provide the National Park Service with an extraordinary resource upon which to mount an effective campaign to not only save the Tidal Basin, but to reshape a bright and hopeful future for this irreplaceable cultural landscape."

The online exhibition is designed to add a narrative perspective to the proposals, bringing to life the various histories of the Tidal Basin, both told and untold, since its completion in 1887. Albrecht and Mellins explore how this 19th century hydrological achievement has been, and continues to be, more than a place of memorialization and recreation through research and essays that explore the history of its construction, years as segregated space, the role of women in its cultivation, decades of protest and demonstrations, and as a locus of contested monuments. These stories are interwoven with the landscape architecture firms’ concepts so that visitors can delve into the material in various ways, connecting each proposal to the past by linking to the history that informed the ideas within.

The Tidal Basin’s Ideas Lab exhibition includes films and digital animations, concise audio/visual presentations of each landscape architect’s proposal, interviews with the architects, and digital opportunities for the general public to get involved, as well as photographs from the National Archive documenting the Tidal Basin’s histories.

“The Tidal Basin Ideas Lab is bringing about innovative solutions to restore one of the country’s most iconic spaces,” said Richard Brown, Vice President of Philanthropy for American Express. “American Express has a rich history of backing efforts to preserve and protect culturally important places and landmarks, and we are proud to support this initiative in collaboration with the National Trust and its partners.”

The exhibition, which is presented by American Express, can be viewed at The public is being invited to show their support for a renewed Tidal Basin by signing a pledge at

High resolution images of the Tidal Basin are available upon request and can be used with proper attribution. Follow the National Treasure launch events and campaign developments at #SavetheTidalBasin on Twitter, Facebook, and Instagram.


About the Tidal Basin Ideas Lab
In 2019 the National Trust for Historic Preservation added the Tidal Basin to its portfolio of National Treasures and initiated, together with the Trust for the National Mall, the National Park Service, and American Express, the Tidal Basin Ideas Lab.

About the National Trust for Historic Preservation
The National Trust for Historic Preservation is a privately funded nonprofit organization that works to save America’s historic places. National Treasures, the National Trust’s signature program, are a revolving portfolio of cherished and nationally significant historic places for which the organization deploys the full range of its preservation, advocacy, and public engagement resources to secure long-term sustainability. For more information, visit: | @savingplaces

About the Trust for the National Mall
As the leading nonprofit, nonpartisan philanthropic partner of the National Park Service dedicated to restoring, enriching and preserving the National Mall, the Trust brings expertise, private funding and in-kind support to time-sensitive restoration and sustainability projects, mobilizes volunteers and provides educational opportunities to ensure that the National Mall endures and evolves as a vibrant space for all. With over 36 million visits annually to the National Mall, combined with aging infrastructure and the need for better visitor amenities throughout the park, the Trust is helping the National Park Service tackle the more than $800 million needed for critical repairs and improvements. To learn more and to support our mission visit | | @thenationalmall

About Skidmore, Owings & Merrill
Skidmore, Owings & Merrill (SOM) is an influential collective of architects, designers, engineers and planners, responsible for some of the world’s most technically and environmentally advanced buildings, and significant public spaces. From a strategic regional plan to a single piece of furniture, SOM's designs anticipate change in the way we live, work and communicate, and have brought lasting value to communities around the world. The firm's approach is highly collaborative, and its interdisciplinary team is engaged on a wide range of international projects, with creative studios based across the globe. To learn more, visit | @skidmoreowingsmerrill

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The National Trust for Historic Preservation, a privately funded nonprofit organization, works to save America’s historic places. | @savingplaces

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