Calgary

Committee recommends Green Line tunnel under Bow River, downtown

After several hours of consideration, a city committee recommended Wednesday tunneling the future Green Line LRT under the Bow River and downtown core.

At $1.95 billion, it's the most expensive of five options presented

The photo on left shows an artist's conception of an underground LRT station with people on the platform and a train in the background. The photo on the right shows an artist's depiction of a train at a grade-level platform.
Artist conceptions of an underground station at 10th Avenue downtown and, left, and an at-grade LRT line on 12th Avenue, right. (City of Calgary)

After several hours of consideration, a city committee recommended Wednesday tunneling the future Green Line LRT under the Bow River and downtown core.

They also agreed to take another look at tunneling under 12th Avenue S.W., an option that was earlier taken off the table.

"I'm thrilled," said CounDruh Farrell, noting she felt an elevated line would be "devastating" for Prince's Island, Eau Claire and Chinatown and "would have had a very detrimental impact on the communities adjacent."

"Cities across the world are taking elevated trains out and putting them underground, or putting them at surface," she said. 

"So it's a really important decision. And what I've been saying is 'let's not destroy the very destination that we're building this line for."

The committee's decision still has to be ratified by city council.

Coun. Evan Woolley told the Homestretch tunneling will be a "much more expensive" option, but an important one.

"When we look at the billions and billions of dollars of taxes that are derived from not only the downtown but the Beltline as well, and the billions of dollars of investment we want to see moving forward, many of the key stakeholders, from the neighbourhoods association to the Stampede to the landowners in the area, they're very keen for us to continue looking at that option," he said.

The committee was looking at five possible choices, going with "Option D," which involves a tunnel that would run all the way from 24th Avenue N., beneath the Bow River and downtown, emerging in the Beltline just south of the CP Rail line.

At $1.95 billion, it's the most expensive of the five options — others range from $1.5 to $1.8 billion — but it's also seen as the least disruptive and best long-term choice.

The full-tunnel route would see the LRT line run underground from 24th Avenue North all the way south to the Beltline in a tunnel beneath both the Bow River and downtown Calgary. (City of Calgary/Screenshot)

All those price tags are "Class 3" estimates, meaning they are believed to be accurate in a range of -30 per cent to +50 per cent.

Other options for crossing the Bow River included running the LRT line down the existing Centre Street Bridge and building a new bridge that would run over Prince's Island Park into Eau Claire.

To get through downtown, other options also included a shorter tunnel beginning at Eau Claire and an elevated LRT line that would run from Eau Claire down 2nd Street S.W., over top of +15 walkways along the way.

A consultant's report suggested the elevated platform would hurt property values along Second Street and cost the city an estimated $680 million in lost property taxes over 30 years.

Rosanne Hill Blaisdell with Harvard Developments, which owns Eau Claire Market and is planning a $1-billion, mixed-use redevelopment of the area, said the company strongly supports the full-tunnel option for the Green Line through downtown.

"An alignment above or even at grade would defame the pristine Prince's Island Park, Calgary's downtown jewel along the Bow River," she told the committee.

Running the LRT above ground would also "prohibit" 46,500 square feet of residential development Harvard is planning for Second Street S.W. , she said, and severely impact the viability of residential towers planned for the north end of the site.

Coun. Druh Farrell speaks during a meeting in council chambers at in the Calgary Municipal Building. (Kate Adach/CBC)

With files from the Homestretch