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710 Tunnel Technical Study Information
ABOUT THE STUDY
The Long Beach Freeway (SR-710) serves as a major north-south link in the Los Angeles County transportation network. It is heavily traveled and congestion is increasing within the corridor. Additional congestion is created on surface streets by a 4.5 mile gap that begins where the SR-710 ends on Valley Boulevard near the Los Angeles/Alhambra border. Motorists who wish to continue traveling north must drive on local streets through the cities of Alhambra, Los Angeles, South Pasadena, and Pasadena. The SR-710 resumes at Del Mar Boulevard in the City of Pasadena and continues 0.6 miles north where it meets the Foothill Freeway (I-210).
Since the 1960s, various conceptual plans have been proposed to close the SR-710 gap; however, none were acceptable to the nearby communities and environmental interests.
In 2006, the Los Angeles County Metropolitan Transportation Authority (Metro) commissioned a Tunnel Feasibility Assessment Study, which concluded that constructing an underground tunnel to connect the SR-710 is feasible. Because a tunnel connection would relieve regional and local congestion, and improve air quality, it gained the support of Metro, the California Department of Transportation (Caltrans), the Federal Highway Administration (FHWA) and the Southern California Association of Governments (SCAG).
Building upon the Metro Assessment Study, the SR-710 Tunnel Technical Study structure and resources provide Caltrans and Metro input from governmental jurisdictions and planning agencies within the study area and region. As shown in the diagram below, two committees, comprised of appointees from each jurisdiction and agency, have been established to review the technical findings of the study. The Steering Committee and Technical Advisory Committee receive input and information from the public through the Community Education and Outreach Program. A team of Tunnel Technical Advisors who are leading experts in tunneling technology serve as resources for the committees and community.