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…
Read MoreSterling C. Robertson Dam impounds the Navasota River forming Lake Limestone, which serves primarily as a water supply reservoir. The dam, completed in 1978, features an approximately 250-foot-wide concrete service spillway which has been slated for significant rehabilitation. As part of the rehabilitation effort, BDI was engaged by Stantec to locate and measure the extent…
Read MoreCarrying 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.…
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Tiger Creek Afterbay Dam, originally constructed in 1931, stands approximately 120 feet tall and 400 feet wide. It features ten spillways equipped with steel Tainter gates and is owned and operated by Pacific Gas and Electric (PG&E). BDI had previously performed pin friction testing on these gates in 2015, and returned in 2024 to reassess…
Read MoreBDI has partnered with the St. Paul District of the U.S. Army Corps of Engineers (USACE) to support ongoing maintenance operations at Lock & Dam sites along the Upper Mississippi River. In the winter, during the off-season for river traffic, these sites are dewatered on a scheduled cycle to allow for inspection and maintenance of key structural components,…
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During routine maintenance at Waterbury Dam, the U.S. Army Corps of Engineers (USACE) identified operational behaviors suggesting potential excess resistance in the gates’ trunnion pins. that raised concerns about the performance of the dam’s spillway gates. Given the critical role these gates play in flood control, ensuring reliability of the dam’s spillway gates was essential.…
Read MoreDuring a major construction project adjacent to the Oxford House at Vanderbilt University Medical Center (VUMC), excavation activities raised concerns about potential impacts on the structural integrity of the building. To proactively address these concerns, construction contractor Robins & Morton engaged BDI to implement a real-time monitoring program designed to ensure the safety of the facility and its occupants throughout…
Read MoreWhen 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…
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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:…
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he 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…
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