Modjeski and Masters, Inc.

Mechanicsburg, PA

One of the world's leading bridge engineering practices

Services: 24
Offices: 19
Projects: 7
Leaders: 2
Founded: 1893

Overview

Modjeski and Masters is an bridge engineering practice, providing design, analysis, inspection, and rehabilitation services for all types of fixed and movable bridges. Established in 1893, it is responsible for the design and long-term maintenance of many of the nation's most recognizable bridge structures, including arch, bascule, cable-stayed, girder, suspension, swing, truss, and vertical-lift structures. The practice also delivers engineering services for tunnels, pedestrian bridges, retaining walls, and custom bridge lighting, operating regional offices throughout the United States.

Founded: 1893

Services

Bridge Design

Comprehensive design services for new fixed, movable, and specialty bridge structures.

Fixed Bridge Design Movable Bridge Design Pedestrian Bridge Design Bridge Lighting Design

Bridge Inspection and Analysis

Inspection and structural assessment services to ensure condition, safety, and integrity.

Routine Inspections In-Depth Inspections Emergency Inspections

Bridge Rehabilitation

Work in this area is organized into supported delivery tasks.

Structural Repair Preservation Modernization To Extend The Useful Life Of Existing Bridges Work In This Area Is Organized Into Supported Delivery Tasks

Life-Cycle Maintenance

Long-term asset management, maintenance planning, and technical support across all phases of a bridge's service life.

Asset Management Research and Code Development

Pier Protection

Engineering assessments and design of protective systems for critical bridge pier structures.

Tunnel Engineering

Work in this area is organized into supported delivery tasks.

Tunnel Design Engineering Inspection Rehabilitation Services For Transit Utility Tunnel Structures Work In This Area Is Organized Into Supported Delivery Tasks

Retaining Wall Engineering

Geotechnical and structural design of retaining walls and earth-retaining structures.

Industries

Bridges Transportation Infrastructure Government Tunnels

Firm type

Structural Engineering Civil Engineering Mechanical Engineering

Projects

Hawk Falls Bridge Replacement

2026 | Northeastern, PA | Pennsylvania Turnpike Commission | Bridges

A new three-rib steel deck arch structure serving a critical corridor of the Pennsylvania Turnpike Commission's Northeast Extension.

I-74 Mississippi River Bridge Replacement

Quad Cities | Bridges

A major bridge replacement project connecting the Quad Cities across the Mississippi River.

Crescent City Connection Lighting System

New Orleans, LA | Bridges

Design of a comprehensive lighting system for the Crescent City Connection.

Huey P. Long Bridge Rehabilitation

Louisiana | Bridges

Long-term preservation and engineering services for the historic Huey P. Long Bridge, protecting critical infrastructure over a 90-year lifespan.

Florida Avenue Bridge

2006 | New Orleans, LA | Bridges

A resilient bridge structure that redefined marine traffic in New Orleans.

Harpers Ferry Bridge Replacement

2001 | Harpers Ferry | Bridges

A landmark bridge replacement project completed to modernize the crossing at Harpers Ferry.

Wurts Street Bridge Rehabilitation

Hudson Valley, NY | Bridges

Rehabilitation of a century-old suspension bridge spanning Rondout Creek in the Hudson Valley, serving as the Engineer of Record.

Credentials and affiliations

Awards

AISC Prize Bridge Award, Major Span Category - Hawk Falls Bridge Replacement (2026)

Affiliations

American Institute of Steel Construction (AISC)

Leadership

Mike Britt

President

Mike Britt serves as the President of Modjeski and Masters. He began his career with the practice as an intern, eventually advancing to his current leadership role where he guides the expansion of its bridge engineering services.

Quentin Johnson

Vice President

Quentin Johnson serves as a Vice President at Modjeski and Masters. Joining in 1986, he has nearly four decades of engineering experience, helping lead the transition from manual drafting methods to modern 3D modeling technologies.