Photographs chosen by our editors from submissions to ENR.com/mountainstates/photos.

The Brent Spence Bridge carries interstates 71 and 75 across the Ohio River between Cincinnati, Ohio, and Covington, Ky.

The joint-venture of Archer Western and Traylor Bros. is being challenged by the bay's geology as they construct the 3-mile-long bridge's substructure. 

Rwanda’s capital, Kigali, is called Africa’s Singapore for its beautiful scenery that attracts international tourists.

The team replacing the FM 457  Swing Bridge over the Gulf Intercoastal Waterway faced hurdles ranging from active vessel traffic to erratic weather to limited space for heavy lifts. Daily troubleshooting helped push the $41.2-million, 27-month project forward. 

The team replacing the FM 457  Swing Bridge over the Gulf Intercoastal Waterway faced hurdles ranging from active vessel traffic to erratic weather to limited space for heavy lifts. Daily troubleshooting helped push the $41.2-million, 27-month project forward. 

The $31-million Hemphill-Lamar Connector in Fort Worth involved building a four-lane, 400-ft-long tunnel under the city’s primary east-west freeway and relocating four active rail lines near one of the country’s busiest rail intersections.

When reconstructing a three-mile segment of Glenn Highway in Eagle Creek, Alaska, engineers had to consider two types of travelers: human drivers and spawning fish.

While replacing the existing 15-ft-long concrete slab bridge for this $7.2-million project, the team faced challenges that included compressible soils and tidal conditions. Because a sealed cofferdam was not employed, all work was conducted during 8-ft tidal cycles.

Reconstructing a busy roadway is tough under any circumstances. But undertaking such a major project at Logan International Airport, where hundreds of thousands of passengers arrive and depart each week in cars and buses, presented a host of challenges.