A Resilient Solution for the National Mall

The National Mall Underground is a novel approach to urban resilience through intense collaboration and innovative thinking. Addressing multiple needs of and threats to the heart of the nation’s capital, the Underground is the first major step towards a 3rd Century Mall that promotes resilience, improves access, and expands public use.


Flood Resiliency for the National Mall Event: As part of Architecture Month 2020: Civic Spirit, please join us for a webinar on June 3, 2020 to learn about the existential threat of flooding on the National Mall, view designs for a comprehensive solution, and contribute your ideas. Click here to learn more.


The Army Corps of Engineers completed in September 2018 its Technical Review of the National Mall Underground. Read the report here.


Watch the National Mall Coalition's May 2017 presentation to the D.C. Council and Council's unanimous resolution requesting the Army Corp' review.

“6 Transportation Projects that Could Change Washington,” Washingtonian, April 2015

“A panacea for parking shortages, bus traffic, fossil-fuel burning, and flooding tucked beneath the Mall? That’s what a proposed parking garage—buried under the grassy expanse between the National Museum of Natural History and the Smithsonian “Castle”—purports to be. The multilevel space could accommodate 900 cars and 200 buses, in addition to a central visitor center and public restrooms. A 34-million-gallon overflow reservoir would prevent a repeat of the flooding that swamped Federal Triangle in 2006. And, rain or shine, more than 1,000 geothermal walls beneath the garage would harvest energy to heat and cool nearby museums and government buildings. It might sound too good to be true, but acclaimed Washington architect Arthur Cotton Moore is spearheading the initiative, lending significant credibility to it."