Restoring the National Mall Turf

Restoring the National Mall Turf: Before and After
Green national turf with US Capitol in distance Dull turf and dirt in front of the US Capitol
The renovated National Mall Turf in front of the US Capitol Building. NPS
The National Mall Turf before the renovation project. NPS
Over 30 million people a year visit the National Mall. Thanks to the renovation of the National Mall turf, a beautiful green expanse will greet them and be sustained for generations to come.



Restoring America's Front Lawn


From 2010 to 2016, National Mall and Memorial Parks staff, oversaw the enormous task of renovation of the National Mall turf. The Mall continued to be one of the most popular tourist spots in the nation during this project.

The renovation of the Mall had many components to make it as sustainable as possible.
Our three "legs" of turf sustainability were infrastructure, agronomy, and use management. All of these "legs" are needed; if one fails then the turf stand will fail.
a machine digs in the dirt in front of the smithsonian castle
Improving the soils on the National Mall.

NPS Photo.

Infrastructure

The renovation of the infrastructure included engineering soils to resist compaction, choosing turf varieties that could resist foot traffic, drainage to keep the soil at optimum moisture for plant growing and avoid compaction, and an irrigation system to promote growth and help with recovery. Hardscape was widened and increased in order to give places for event setup that is not on turf.

men roll out new sod in front of US Capitol
Laying sod on the National Mall.

NPS

Agronomy

The agronomy program is a regimen of aerifying, fertilization, water management, regular mowing, and seeding. All of these are aimed at providing everything the turf stand needs- air, water, pore space, nutrients, succession, and grooming. All of these actions can produce a dense and vibrant lawn.

masses of people on the national mall from far away
Inauguration Day, 2016.

NPS

Visitor Use Management

The use management aspect was in many ways the most challenging. Landscapes are not often seen as having capacity issues and people are not use to having use limitations, so this required a great deal of outreach and education. Strategies include recognizing decline and closing for rest periods, limitations to how long stages, tents, and other structures are allowed on turf, prescribed turf protective decking, and vehicle/weight limitations.


Completed in late 2016 in time for the 2017 Inauguration, the Mall was at a very tender stage of grow in. Protective decking was installed on 16 of the 18 acres to protect the turf from Inauguration sized crowds. The Mall was able to stand up to that intense use even at the relatively young age of the finished product.

Although the Mall renovation is successful, we will continue to learn more about how to make “America’s Front Lawn” more durable and sustainable. Rest assured, our strategies will fall within one of those three legs of sustainability.

For detailed documents and plans regarding the reconstruction of the National Mall turf soil, check out its project page on our Planning, Environment & Public Comment system.