Transportation
UHPC Overlay Bond Strength Evaluation
The Delaware Memorial Bridge, which carries I-295 across the Delaware River between Delaware and New Jersey, is a critical transportation link for the region. As part of preservation efforts the Delaware River Bridge Authority had an ultra-high performance concrete (UHPC) deck installed on the bridge deck. To evaluate the effectiveness of the repair, BDI was…
Read MoreDrone-Assisted Bridge Inspection of I-380 Over the Delaware and Lackawanna Railroad
BDI partnered with engineers to support a routine National Highway Institute (NHI) bridge inspection of the I-380 Bridge over the Delaware and Lackawanna Railroad near Scranton, Pennsylvania. The bridge’s complex geometry and challenging access conditions made traditional bridge inspection methods less efficient, creating an ideal application for drone-based bridge inspection technology. To improve inspection coverage…
Read MoreDiagnostic Load Testing for Bridge Load Rating
Introduction Ask any bridge engineer and they will tell you that a load rating is only as good as the assumptions that it’s based upon. When evaluating bridges, load ratings performed using traditional analysis methods can sometimes be overly conservative and result in unnecessary load restrictions. Section 8 of the AASHTO Manual for Bridge Evaluation…
Read MoreBDI Awarded Colorado DOT Statewide Program-Specific Contract
Bridge Diagnostics, Inc. (BDI) is proud to announce our selection for the Colorado Department of Transportation’s (CDOT) 2025 Statewide Program-Specific Contract for Bridge Ultrasonic Testing (UT), Pin Inspections, Average Daily Traffic (ADT) Counts, Scour Evaluations, and Load Rating Engineering Services. This multi-faceted contract highlights CDOT’s continued commitment to advancing the condition assessment and safety of…
Read MoreRed Cliff Bridge LLT
Red Cliff Bridge is a cantilevered steel arch bridge located near Red Cliff, Colorado. Towering approximately 200 ft over Eagle river, it is one of Colorado’s most iconic bridges and has been listed on the National Register of Historic Places since 1985. The bridge was completed in 1941 and has required significant repair and restoration…
Read MoreThe Pearl Harbor Memorial Bridge
The Pearl Harbor Memorial Bridge (Q Bridge) is a twin extradosed structure carrying Interstate 95 over the Quinnipiac River in New Haven, Connecticut. Since its opening in 2012, inspectors have noticed cracking in several areas of the bridge, including the tops of the prestressed concrete box girders, the faces of the cable-stay towers, and near cable anchorages at…
Read MoreSitka Bridge
Sitka Harbor / John O’Connell Bridge in Sitka, AK is a historic civil engineering landmark and one of the oldest cable-stayed bridges in the US. Under Alaska DOT’s inspection program, this structure requires a special in-depth inspection every decade. As part of the inspection team, BDI conducted a comprehensive evaluation of the stay cables. Our work included:…
Read MoreRestoring a Critical Link on the Alaska Highway
When a fuel tanker accident caused extensive fire damage to the Sikanni Chief River Bridge—a prestressed concrete bridge along the Alaska Highway in northern British Columbia—swift, expert evaluation was essential to restore safe passage on this key transportation corridor. Therefore, WSP engaged BDI to support the emergency structural assessment efforts following the incident. Our role was…
Read MoreMonitoring the Sunshine Skyway Bridge
Carrying I-275 over Tampa Bay, the Bob Graham Sunshine Skyway Bridge is a cable-stayed structure that plays a vital role in Florida’s transportation network. To support long-term performance monitoring and asset management, the Florida Department of Transportation (FDOT) contracted BDI to install a structural health monitoring system focused on capturing vibration behavior of the bridge.…
Read MoreSDOT Bascules
Fremont, Ballard, and University Bridge are double-leaf bascule bridges located in Seattle, WA. All three bridges operate frequently, with Fremont in particular being one of the most frequently opened moveable drawbridges in the US. The bridges also have significant historical and aesthetic significant to Seattle, and are all listed on the National Register of Historic…
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