MidAmerica St. Louis Airport

Near Doubling of MidAmerica Airport Terminal Finishing in Summer


Phase three of the $34 million expansion project at MidAmerica St. Louis Airport is progressing toward completion this summer.

The existing 53,000-square-foot terminal adjacent to Scott Air Force Base in Mascoutah, Illinois will grow by 41,000 square feet to accommodate continuing passenger growth and provide a host of new amenities.

A new, standard TSA screening area, service animal relief area, new family restrooms, nursing room, expanded departure lounge and two additional boarding bridges are part of the construction project, headed by Holland Construction Services.

$31 million in funding for the expansion comes from federal and state grant dollars via the Federal Aviation Administration’s Airport Improvement Program.

“We are excited to be nearing completion of the critical infrastructure and safety improvement projects that will enhance overall operations at the airport, which has been seeing significant passenger growth and continues to operate as a joint-use airport with Scott Air Force Base,” said St. Clair County Chairman Mark Kern.

Renovation of the existing terminal is underway which will include many of the same upgrades as the terminal expansion. Final improvements to the existing terminal are anticipated to reach completion in late 2023.

A $37.7 million project to add nearly 3,100 linear feet of new Taxiway Lima pavement and a new taxiway bridge over Crooked Creek is under construction. It will service as Boeing’s new production facility that is expected to open in 2024.

Holland Construction Doubling Size of MidAmerica St. Louis Airport


Swansea-based Holland Construction Services is constructing Phase II of an ambitious expansion of MidAmerica St. Louis Airport that will nearly double its footprint to serve a large increase in travelers.

Airport figures reveal there is a 376 percent increase in MidAmerica travelers from 2015-2019. The airport’s projected volume for 2021 is more than 340,000 travelers.

Holland Senior Project Manager Steve Teipe said the $25 million construction project is adding 41,000 square feet to the 53,000-square-foot airport in Mascoutah, IL that opened in 1997. Phase I of the project took place from January to April 2020 and involved the relocation of electrical service for the terminal.

Phase II, which is currently under way, includes construction of the core and shell of the new addition including the roof, aluminum curtain wall framing, glazing, glass fiber concrete panels and the extension of the terminal’s exterior canopy.

Holland completed the formwork, waterproofing and reinforcing steel for the mat foundation slab in late June. The project team is currently putting in concrete basement foundations and forming the basement walls for the addition. Structural steel is projected to arrive in August.

Major facets of the expansion project include relocating Transportation Security Administration (TSA), adding two more gates and passenger jet bridges and building and renovating ADA-compliant restrooms. An expanded departure lounge, nursing room, additional concessions room and service animal relief area are also within the scope of the expansion.

Additional federal funding earmarked for MidAmerica St. Louis Airport will fund Phases III and IV. The project is anticipated to be completed in late 2023.

A total of $6.5 million in federal transportation grant monies were awarded in September 2020, followed by $12.6 million in May 2021 to support the project’s final phase.

HOK is the project designer.