Three international TY Lin projects win 2021 project of the year award from the ASCE section of Los Angeles

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SAN FRANCISCO – (COMMERCIAL THREAD) – TY Lin International (TYLI), a globally recognized full-service infrastructure consulting firm, announces that three TYLI projects have won the 2021 Project of the Year award from the Los Angeles Chapter of the American Society of Civil Engineers (ASCE) in California. First, the North Atwater Non-Motorized Multimodal Bridge in Los Angeles was named Bridge Project of the Year 2021. Second, the I-5 High Occupancy Vehicle (HOV) Improvement Project in Santa Ana won. the 2021 Construction Project of the Year Award. Finally, the Oso Parkway Bridge on State Route 241 in Orange County was named the 2021 Road and Freeway Project of the Year.

For the North Atwater Bridge, TYLI provided construction engineering services and significant design support throughout construction under an on-call contract with the City of Los Angeles Department of Public Works. , Bureau of Engineering. The new 325-foot-long bridge accommodates pedestrians, cyclists and horse riders and is possibly the world’s first cable-stayed equestrian bridge.

TYLI was the lead design consultant for the final design phase of the I-5 HOV Improvement Project, working closely with the Orange County Transportation Authority (OCTA), California Department of Transportation (Caltrans) District 12 and the city ​​of Santa Ana. The project provides a significant benefit to the traveling public by reallocating the existing width of the I-5 motorway and adding a second HOV lane in each direction between SR 55 and SR 57.

For the Oso Parkway Bridge project, TYLI provided final design services to the project owner, transportation corridor agencies, and worked closely with Caltrans and Orange County. The new bridge provides automobile traffic with a direct connection between Los Patrones Parkway and SR 241, improving safety and traffic flow on Oso Parkway and under the bridge.

About the North Atwater Non-Motorized Multimodal Bridge (Bridge Project of the Year 2021):

Under an on-call contract with the City of Los Angeles Department of Public Works, Bureau of Engineering, TYLI provided construction engineering services and extensive design support throughout the construction of the North Atwater multimodal non-motorized bridge in Los Angeles, California. Perhaps the world’s first cable-stayed equestrian bridge, the new 325-foot-long crossing is the first of three bridges to be completed in the Glendale Narrows section of the Los Angeles River.

Featuring a spectacular 125-foot-tall mast and steel suspension cables, the North Atwater Bridge is located between the growing community of Atwater Village and Griffith Park, one of the largest city parks in the United States. The signature structure provides users with a safe and more efficient connection to the Los Angeles River Bike Trail and the Los Angeles River Greenway Trail that run along both sides of the river.

The bridge deck is divided into two separate 12-foot-wide lanes to accommodate pedestrians, cyclists and horse riders. While the pedestrian / bike path uses a hardwood deck and stainless steel lattice railings, the equestrian side is topped with horse-friendly rubber pavers and a less transparent wood railing system.

The dynamic behavior of the bridge was an important design consideration due to the thin and light deck and the relatively heavy equestrian live loads. A system of tuned mass dampers has been designed to mitigate the potential for resonant vibrations as groups of riders cross the bridge.

About HOV Improvement Project I-5 (Construction Project of the Year 2021):

Working closely with OCTA, Caltrans District 12, and the City of Santa Ana, TYLI served as the Senior Design Consultant for the final design phase of the I-5 HOV Improvement Project in Santa Ana, California. .

The project provides a significant benefit to the traveling public by reallocating the existing width of the I-5 motorway and adding a second HOV lane in each direction between SR 55 and SR 57. In total, the project added nearly six miles of HOV lanes to a congested portion of I-5, which will be traveled by 400,000 vehicles each day by 2035.

Project challenges included replacing the northbound and southbound single lane HOV lanes with two southbound HOV lanes while realigning two northbound HOV lanes in an area previously used for northbound multi-use lanes. The innovative solutions included the construction of a retaining wall under the abutment of an existing railway bridge to create the space needed to accommodate the northbound multi-use tracks. Using creative geometric designs to “thread” the four HOV lanes under bridges eliminated the need to widen southbound.

TYLI excelled at proactively identifying potential issues and risks, allowing ample time to develop resolutions and partner with stakeholders to reach consensus on final decisions. In addition, by anticipating problems, the company generated cost savings while meeting budget and schedule requirements.

About Oso Parkway Bridge on State Route 241 Project (Road and Freeway Project of the Year 2021):

TYLI provided final design services to the project owner, Transportation Corridor Agencies, and worked closely with Caltrans and Orange County for the Oso Parkway Bridge Project on SR 241 in Orange County, in California.

Completed on a highly accelerated schedule, the Oso Parkway Bridge provides automobile traffic with a direct connection between Los Patrones Parkway and SR 241, improving safety, connectivity and traffic flow. Prior to this project, drivers were required to access SR 241 or Los Patrones Parkway by exiting through an exit ramp, waiting at a traffic light intersection, and using an access ramp to access either or the other of the roads.

The Oso Parkway Bridge offers three lanes in each direction and dedicated bicycle lanes and pedestrian sidewalks to improve user safety. A new sidewalk was also built on the south side of Oso Promenade for students to access Tesoro High School.

The design of the bridge involved improvements to the local pavement, including an asphalt pavement, storm drain, curb and gutter, sidewalks, Americans with Disabilities Act (ADA) improvements, service relocations public areas, signage, markings, drainage improvements and traffic light modifications.

Project challenges included significant utility relocations due to the demands of bridge construction and right-of-way treatment. In addition, the drainage design had to meet Orange County and Caltrans standards based on various owners and rights-of-way within the project boundaries.

TYLI also provided design support services during construction to the county as required. The staged construction included pedestrian detours to maintain a travel path for students from the adjacent Tesoro High School at each stage of construction.

About TY Lin International:

Founded in 1954, TY Lin International is a globally recognized full service infrastructure consultancy company committed to providing innovative, cost effective and buildable designs for the global infrastructure market. With 3,200 employees working in 65 offices across the Americas, Asia and Europe, the company provides support on projects of varying size and complexity. TY Lin International is a member of Dar Group, a global private professional services group, and its industry-leading family of global infrastructure companies. For more information about the company, please visit www.tylin.com.


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