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Two T.Y. Lin International Projects Win 2022 ACEC California Engineering Excellence Merit Awards
January 13, 2022

T.Y. Lin International's Announces Completion of Parkside Pedestrian Bridge in Washington, DC
January 11, 2022

Selected highlights from more than six decades of T.Y. Lin International Group history, including some of our most significant company milestones and groundbreaking projects.



Tung-Yen Lin, known as “T.Y.,” was born on November 14 in Fuzhou, China.


T.Y. Lin joins the faculty at UC Berkeley and he begins his innovative research in pre-stressed concrete that leads to significant advancements and the firm’s early focus.


T.Y. Lin founds T.Y. Lin Associates in Los Angeles, which later became T.Y. Lin International.


T.Y. Lin introduces the concept of constructing a bridge across the Bering Strait, known as the Intercontinental Peace Bridge. Designs the 13-story, 1800 Pacific Building in San Francisco, one of the earliest structures to use post-tensioning to control lift slab deflection.


The firm relocates to San Francisco, increasingly expands its specialty in pre-stressed concrete to broader consulting services with designs that include conventionally reinforced concrete, structural steel, masonry, and timber-framed structures.


T.Y. Lin International completes the design of the Bank of America in Managua, Nicaragua, an 18-story shear wall office building. The reinforced concrete tower was one of two structures left standing after an earthquake shook downtown Managua in 1972.


International growth begins with T.Y. Lin International offices established in Taipei and Singapore.


T.Y. Lin International completes the Rio Higuamo Bridge in the Dominican Republic, the first pre-stressed, concrete segmental long-span bridge constructed in the Western Hemisphere.


Growth increases with new offices in Kuala Lumpur. Merger with Maine-based Hunter-Bellow Associates.


T.Y. Lin International designs the Moscone Convention Center in San Francisco, which uses long-span bridge technology for the 250,000-square-foot, column-free grand exhibit hall.


T.Y. Lin receives the National Medal of Science from President Ronald Reagan.


T.Y. Lin International completes the award-winning design of the Smith Avenue High Bridge in St. Paul, Minnesota. The use of high-strength steel strands in the arch ties is one of the most innovative features of the design.


T.Y. Lin International Group is acquired by Dar Group, an international network of professional service firms, comprised of over 17,000 staff members assisting clients in over 100 countries around the world.


Period of geographic and service capabilities growth marked by significant acquisitions of California-based McDaniel Engineering, Chicago-based BASCOR, Washington’s DGES Consulting Engineering, and New York’s DRC Consultants.


Following the Loma Prieta earthquake in California, T.Y. Lin International plays a central role in the development of new and advanced techniques; practical engineering tools; and design standards for bridge assessment; seismic retrofit of existing structures; and the design of new bridges.


T.Y. Lin International Group’s presence in Asia Pacific expands with the opening of an office in Chongqing, China.


Dr. Tang becomes Chairman of the Board of T.Y. Lin International.


T.Y. Lin International begins work on the San Francisco-Oakland Bay Bridge. The single-tower, Self-Anchored Suspension (SAS) design is selected for the new Eastern Span of the San Francisco-Oakland Bay Bridge.


Growth continues with acquisitions of Miami-based H.J. Ross Associates, Inc., Northern California’s CCS Planning and Engineering, multi-location FRA Engineering and Architecture, and Medina Consultants on the East Coast, further bolstering service offerings across multiple lines of business including ITS/traffic engineering, airports, rail and transit, water resources, and more.


T.Y. Lin International begins design of the reconstruction of the Wacker Drive and Congress Parkway interchange for the City of Chicago as well as part of the Wacker Drive Viaduct.


Taiwan High Speed Rail is completed. T.Y. Lin International was responsible for the preliminary and 90% final design of 25 elevated bridges across Taiwan.


T.Y. Lin International serves as the Engineer of Record for McDonald’s in the Southeastern U.S., New York State, and Pennsylvania.


The New Benicia-Martinez Bridge opens to traffic, designed by T.Y. Lin International and constructed using the cast-in-place balanced cantilever method. The largest lightweight concrete segmental bridge in California, the superstructure has spans up to 659 feet long.


T.Y. Lin International completed engineering design and construction phase services for the $360 million South Terminal Expansion Program at Miami International Airport. The firm was also the engineer-of-record for landside roadways adjacent to the South Terminal facility.


T.Y. Lin International was selected to provide ongoing flood insurance studies and flood insurance rate maps in support of FEMA’s Map Modernization Program.


T.Y. Lin International grows its position as a global leader in the design and construction of largescale infrastructure projects around the world, including record-breaking signature bridges, major airport expansions, and new transit systems across the Americas and Asia Pacific. Acquisitions include Lindbergh & Associates in the Southeastern U.S., IDEAM S.A. in Madrid, Spain, and The Municipal Infrastructure Group Ltd. in Toronto, Ontario, Canada.


Designed by T.Y. International, the historic Hoover Dam Bypass Bridge opens to traffic.


Construction is completed on the Port Mann Bridge in Vancouver, British Columbia, Canada, which was designed by T.Y. Lin International.


California's largest public works project to date, the new San Francisco-Oakland Bay Bridge opens to traffic, with T.Y. Lin International as Engineer of Record.


The Chicago Transit Authority’s reconstructed Dan Ryan Red Line opens to riders. T.Y. Lin International served as Project Design Oversight Lead and Designer of Record on the project.


T.Y. Lin International begins environmental and engineering services for the California High-Speed Rail Bakersfield to Palmdale Section.


T.Y. Lin International acquires South Carolina-based Lindbergh & Associates, strengthening and diversifying its markets across the Southeast United States and building a strong Federal services program.


The Twin River Bridge opens in Chongqing, China, featuring an innovative, partially cable-supported girder design by T.Y. Lin International. Connected by a tunnel under the city’s Yuzhong District, both bridges carry vehicular traffic and transit rail.


T.Y. Lin International acquires majority interest in IDEAM S.A. in Madrid, Spain, a premier structural engineering consultancy specializing in major bridges and complex structures throughout Europe, Latin America, and the Middle East.


The Illinois Route 390 Tollway opens as the first all-electronic roadway on the Illinois Tollway system. T.Y. Lin International provided Overall Corridor Construction Management for the four-year project.


Significant upgrades are completed for historic Niagara Falls State Park in New York. T.Y. Lin International led the multi-year comprehensive capital rehabilitation and improvement plan.


Representing one of the most high-profile infrastructure projects in North America, the Samuel De Champlain Bridge over the St. Lawrence River in Montréal, Québec, Canada, opens to traffic. T.Y. Lin International served as Managing Partner and Lead Designer for the project.


T.Y. Lin International acquires The Municipal Infrastructure Group Ltd. in Toronto, Ontario, Canada, a civil engineering consulting practice in the water, land development, and transportation sectors, establishing its first location in Canada.


The 10-mile Bay Area Rapid Transit (BART) extension from Fremont to northern San Jose in California opens to users. T.Y. Lin International provided engineering design services for the historic project, which fulfills a decades-long plan of linking South Bay communities with BART and advancing public transportation use in the region.