Bridges and Structures

Our team has the ability to provide innovative options and turn them into real solutions for you.

With more than 5,000 structures inspected and designed, our bridge department is one of the most recognized in the industry across the Country. Our team is experienced in a variety of services, BLN has the flexibility to meet the specific needs of most any project.

Services We Provide

  • Bridge Replacements
    • Long Span: steel through and deck trusses
    • Medium Span: prestressed concrete, post-tensioned beams, and steel beams/girders
    • Small Span: reinforced concrete, post-tensioned slabs, and prefabricated structures
    • Complex Structures: curved girder, post-tensioned beams, and slant leg frames
    • Other Structures: railroad and pedestrian bridges
  • Bridge Studies
    • Hydraulic analysis and floodplain modeling
    • Bridge condition reports
    • Engineering assessment reports
    • Bridge scoping reports
    • Economic life-cycle cost comparisons
  • Bridge Rehabilitations
    • Deck overlays and widening
    • Bridge deck replacements
    • Superstructure replacements
    • Timber covered bridges
    • Steel trusses and concrete arches
    • Historic bridges
  • Bridge Inspections and Inventories
    • National Bridge Inspection Standards (NBIS)

Featured Projects

Image for Madison County Bridge No. 502

Madison County Bridge No. 502

BLN coordinated the replacement of Bridge No. 502, with a new bridge consisting of a six-span, pre-stressed concrete U-Beam bridge, approximately 693 feet in length.

Image for I-70 Over SR 121

I-70 Over SR 121

This project was designed with an Accelerated Bridge Construction method using a slide-in bridge installation. This innovative BLN design minimized single-lane closure of I-70 for only eight days per superstructure slide. The new bridges were slid into place with a single-lane closure of I-70.

Image for SR 66 Over Green River Road

SR 66 Over Green River Road

This project included the replacement of the existing bridge on SR 66 over Green River Road. The existing single-span steel girder bridge was replaced with a new curved three-span post-tensioned concrete bulb-tee beam bridge. The interior supports consist of integral post-tensioned concrete straddle bents. The total bridge length is 317’. BLN also completed the design of a mechanically stabilized earth retaining wall extension. This quality project was recognized by ACEC Indiana in 2005 by awarding the project an Honor Award in the Engineering Excellence Competition. The bridge project also went on to receive a 2005 National PCI Design Award.

Image for SR 1 Over I-70

SR 1 Over I-70

Originally, this bridge was planned for a superstructure replacement by INDOT, but our bridge team recognized that the deck and steel beams of the interior spans were still in good condition and proposed an alternative two-span solution that reduced construction costs by $100,000, saving the client time and money.

Image for Newton County Bridge No. 57

Newton County Bridge No. 57

This project was for the steel deck truss rehabilitation for Newton County Bridge No. 57. BLN's work included the inspection, preparation of the TE Funds application, bridge condition report, detailed plans, and specifications, and construction inspection. Design services included the development of a bridge rail that was aesthetically similar to the original rail but incorporated modern safety features and the use of riveted connections to maintain the bridges historical appearance. Extensive environmental coordination was required.

Image for Monroe County Bridge No. 12

Monroe County Bridge No. 12

This project included the replacement of Stinesville Road over Jacks Defeat Creek bridge. It also included the replacement of the existing two-span bridge with a new two-span structure on a similar alignment. The proposed bridge consisted of a two span (89 feet – 89 feet) continuous composite prestressed concrete bulb–tee beam bridge with a concrete deck. An MSE wall was built around a precast concrete box culvert carrying the existing Pogues Run through the project. The MSE wall was used at the west abutment to reduce the bridge length and reduce project costs.