Replacing the concrete open spandrel arch bridge that had served as Pittsburgh’s eastern gateway for nearly a century was more challenging than the original construction.

Going forward, MDG will do business as HDR | Maintenance Design Group. The firm will continue operating its Denver office.

When drivers began using two new lanes of the Bayonne Bridge between Staten Island and New Jersey last month, they crossed not only the Kill Van Kull waterway but also a nexus between a historic engineering past and a modern engineering present.

Peter Zipf, former chief engineer of The Port Authority of New York & New Jersey and a 30-year agency veteran, joined Omaha design firm HDR on Oct. 5 as vice president and northeast region transportation director based in New York City, ENR confirms.