Public Opinion Split on I-710 Tunnel Plans in Southern California

The public comment period has ended on one of Southern California's most persistent planning controversies—a proposal to connect the I-710 Freeway between Pasadena and Alhambra. The current plan calls for a long underground tunnel.

2 minute read

August 25, 2015, 10:00 AM PDT

By James Brasuell @CasualBrasuell


"Caltrans has received more than 2,500 letters responding to the 710 Freeway extension project, so many that two weeks after the six-month comment period has closed, the state transportation agency is still tallying the responses," reports Steve Scauzillo.

Those in favor of digging an underground tunnel to close the 4.5-mile gap from the 10 to the 210/134 freeways live south and east of the project, while those opposed live north or within the project footprint.

Rep. Adam Schiff, D-Burbank, who recently announced his opposition to the tunnel option "is joined by Pasadena, South Pasadena, Glendale, Sierra Madre, La Cañada Flintridge, the Natural Resources Defense Council, the Los Angeles Conservancy, the National Trust for Historic Preservation, the West Pasadena Residents Association and state Sen. Carol Liu, D-Glendale in opposing the tunnel and/or calling the EIR inadequate."

In support of the project, according to Scauzillo: "Alhambra, Monterey Park, Rosemead, San Gabriel, Montebello’s Mayor Jack Hadjinian, San Marino, La Puente, West Covina, Covina, El Monte, La Verne, Pomona, Pico Rivera, South El Monte, Diamond Bar, Temple City, Huntington Park Councilman Johnny Pineada, Lynwood, South Gate, Commerce, state Sen. Bob Huff, R-Brea; state Sen. Ed Hernandez, D-West Covina; Assemblyman Ed Chau, D-Monterey Park; Assemblyman Roger Hernandez, D-West Covina; Sen. Tony Mendoza, D-Montebello; Los Angeles Community College District Board Member Mike Eng; the San Gabriel Valley Council of Governments and the Florence-Firestone/Walnut Park Chamber of Commerce. Plus, the tunnel project received letters of support from numerous local union groups, including ironworkers, pipe-fitters, electrical workers and sprinkler fitters."

Scauzillo also provides details about a "Beyond the 710" alternative, which "would turn the [south] end of the freeway into a boulevard that takes cars through to Cal State Los Angeles and connects to Alhambra Avenue and Mission Road." Under this proposal calls for the north end to "[connect] streets and as many as 1,300 new residential units from 35 'new acres' of filled-in land linking West Pasadena with Old Pasadena, a vibrant shopping district."

Monday, August 24, 2015 in San Gabriel Valley Tribune

Young Professional

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban and Environmental Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

September 23, 2026 - Zachary Whalen

Passengers board an Amtrak train under a cloudy sky.

Amtrak, CN end decades-long dispute with eight-year agreement

The new operating agreement establishes an updated framework for the companies to work together, including processes to resolve disputes.

September 18, 2026 - Mass Transit

An Airo train driving towards the camera on a track. There is a forest behind it.

Northwest rail fans eager for Sept. 30 debut of Amtrak’s Airo fleet

Get ready for that new train smell and more seats. But they won’t go faster or run more frequently on the Cascades route in Washington and Oregon.

September 22, 2026 - Washington State Standard

Four cars of the LAX SkyLink. They are white, and there is no clear front or back. They have black windows.

LAX SkyLink opening delayed again, contractor won’t commit to new deadline

The project was supposed to open its doors to the public in 2023.

September 27 - LA Times

A Caltrain train picks up a large crowd of people at a station.

Caltrain may slash over one-third of its stations

If Bay Area voters reject two transit tax measures, Caltrain, BART and AC Transit will see steep service cuts.

September 27 - Mercury News

An aerial view of Interstate 77 crossing a body of water.

A 'dangerous' precedent: North Carolina successfully pressures communities into voting for toll roads

Two mayors resigned from the Charlotte Regional Transportation Planning Organization after it voted in favor of the toll roads.

September 27 - Spectrum Local News

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.

Senior Planner

City of Thousand Oaks

Community Development Director

City of Wisconsin Rapids

Professor of Urban Planning

Harvard University Graduate School of Design