Jefferson National Expansion Memorial – Gateway Arch Grounds Renovations

St. Louis, Missouri
National Park Service
Start Date
August 2012
Completion Date
Construction Cost
$396 million

Located in the City of St. Louis, Missouri the 193-acre Jefferson National Expansion Memorial (JNEM) is situated on the west bank of the Mississippi River. The JNEM is the site of the Gateway Arch; the iconic symbol of St. Louis. In addition to the Arch, the JNEM is home to the Museum of Westward Expansion (located underground beneath the Gateway Arch) and the Old Courthouse. The JNEM is a National Historic Landmark.

The public-private partnership CityArchRiver was established to support and coordinate a multi-phased project to invigorate and expand the JNEM and to improve connections to downtown St. Louis and the Riverfront. The Project includes renovation of the Arch grounds, surrounding roadways, Mississippi Riverfront, and expansion of the Museum.

DMA’s Structural Engineers prepared plans and specifications for a 340-foot long, 11-span pedestrian bridge; and all site structures including site retaining walls, stairs, ADA accessible ramps, and utility structures.

Our Civil Engineers prepared plans and specifications for relocation and replacement of site utilities including water and gas. We were also responsible for the development of grading and excavation plans; and digital terrain modeling for the Project.

Plans and specifications were developed for multiple bid packages to accommodate phased construction and to permit the park to remain open for visitors.

This was a unique project in that numerous stakeholders were involved as a result of the public-private funding partnerships. We participated in numerous stakeholder review sessions with federal, state, and local agencies to obtain approvals for the Project. Additionally, our staff participated the development of key components of an Environmental Assessment (EA) for the Project for compliance with the National Environmental Policy Act (NEPA).