Our FootprintExpanding Our Reach. Staying True to Who We Are.

MacKay has expanded into new market sectors, bringing new service offerings, in new regions across the United States—and our journey tells the story. We are moving forward with meaningful projects and purposeful partnerships, strengthening our ability to serve clients wherever they are. Each MacKay branch represents a cohesive team of dedicated professionals, a network of trusted relationships, and a shared commitment to delivering the technical excellence and values-first approach that defines everything we do.

Chicago Riverwalk with pedestrians beside the river, surrounded by glass-and-steel skyscrapers and a nearby bridge

We’re Here for You.

We are building an integrated, multidisciplinary, infrastructure and environmental services firm that combines the reach and resources of a national practice with the responsiveness and local knowledge of a trusted regional partner.

Smiling man in glasses and a blazer writing at a meeting table with a glass of water

We’re Here for You.

Our Locations.

Washington: Vancouver, Pasco, Federal Way, Fife, Woodinville, Wenatchee
Oregon: Portland
Idaho: Kellogg
Montana: Butte, Helena, Bozeman, Billings, Anaconda, Libby
California: Roseville, San Diego
New Mexico: Albuquerque, Raton
Colorado: Denver, Fort Collins
Illinois: Chicago
Louisiana: Mandeville, Scott
Georgia: Atlanta

Mackay-branded modern office building surrounded by landscaped gardens at sunset

Our Locations.

Markets that Make a Difference. Services that Scale.

Through trusted relationships, specialized expertise, market sector fluency, proven project experience, and regional knowledge, we’re continuously improving and innovating to realize the goals of our clients and communities. Together, our firm is proud to deliver an expanded suite of services across more markets, more disciplines, and more geographies than ever before.

Our Market Sectors.

High-voltage transmission towers and power lines stretch across rolling golden grassland with a winding dirt road under a clear blue sky.

Our Disciplines.

MacKay surveyor in high-visibility gear reviews construction plans while operating a GNSS rover and controller at a job site.

Land Surveying

Site plan showing a sports complex with a baseball/softball diamond over a soccer field, nearby pickleball courts, parking, paths, and trees.

Land Planning & Permitting

Metal riverside viewing platform with railings extends over a calm, tree-lined river, with mossy boulders in the foreground and forest reflections on the water.

Natural Resources & Permitting

Curving paved pathway through a landscaped park with boulders, native grasses, and evergreen trees, featuring a stacked cairn labeled Story Stone and a distant snow-capped mountain under a clear blue sky.

Landscape Architecture

Aerial view of a mining site with colorful tailings ponds and a residential area along its edge

Environmental Remediation Services

Tiered stone retaining walls beside a two-lane road, with grassy slopes, evergreen trees, and mountains under a cloudy sky

Geotechnical Engineering

Geographic Information System map of industrial port and surrounding buildings and typography

Geographic Information Systems (GIS)

Utility pole with multiple transformers and overhead power lines against a clear blue sky

Electrical Engineering

Workers in high-visibility gear guide a crane lifting large switchgear at an electrical substation construction site, with wind turbines on distant hills.

Construction Management & Inspection

Riparia Environmental Resilient Ecosystems, Responsible Solutions.

Riparia Environmental builds on a strong legacy of environmental expertise. Formerly part of Olson Engineering, the team was rebranded and launched as Riparia Environmental following MacKay’s acquisition of Olson. The name is new, but the service, knowledge, and trusted expertise have been growing for decades.

As a MacKay subsidiary, Riparia extends the life of our design and engineering work by helping clients care for the systems once they’re built. Whether it’s maintaining stormwater infrastructure, monitoring restored wetlands, or managing long-term compliance, Riparia ensures that projects remain resilient, functional, and sustainable well beyond initial construction.

With decades of combined experience, Riparia’s specialists partner with business park managers, HOAs, developers, and public agencies to deliver practical, science-based solutions that protect and restore natural systems. Their approachable, hands-on style means clients get technical excellence delivered with clarity, reliability, and respect for the places we all call home.

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Where We’re Going.

More purpose. More expertise. More possibility. This is MacKay in motion. Meet our newest partners and discover the exciting potential of what comes next.

New Acquisitions Growing with Purpose

Mountain valley surrounding a calm lake, with forested slopes, rocky shoreline, and dramatic clouds reflected in the water

Where We’re Going.

More purpose. More expertise. More possibility. This is MacKay in motion. Meet our newest partners and discover the exciting potential of what comes next.

New Acquisitions Growing with Purpose