Time for a bridge to mainland?
Idea not likely to stay afloat, experts say
Katherine Dedyna, Times Colonist
Published: Friday, July 25, 2008
When ferry fees go up, so do calls for a fixed link between Vancouver Island and the mainland.
"Start pouring the foundations for the bridge today," Chris Prestly posted on the Times Colonist website in the wake of this week's hike to $61.40 for car and driver come Aug. 1. "I've got no problem paying a toll vs. these insane ferry surcharges."
But does the idea hold water? Maybe not, experts say. Here's why.
YOU CAN'T GET THERE FROM HERE
A fixed link would definitely not run between Victoria and Vancouver. It would likely be located somewhere between Nanaimo and Duncan and Delta. That's because the route would need to cover the shortest distance across the Strait of Georgia, says chief engineer Dirk Nyland of the Ministry of Transportation.
For Victorians, that would mean time-consuming, gas-guzzling trips over the Malahat, and traverses on Galiano and Saltspring islands.
AND IT WOULDN'T BE CHEAP
According to a 2002 report posted on the B.C. Ministry of Transportation's website, fares to cross such a bridge would range between $260 to $800. And that's only one way.
Why so much?
Costly fares are almost inevitable for such structures, because they are so expensive to build. The province could not bear the cost alone, and a private-sector partner would require a return on its investment of between 12 and 20 per cent, according to the ministry.
Even six years ago, the province projected the link would cost between $8 billion and $12 billion.
University of Victoria economist Daniel Rondeau says he wouldn't be surprised if the real costs rose "at least 50 per cent," given inflation and increased costs in labour, concrete and steel.
"It's one in a thousand that a cost-benefit analysis would ever turn up something like 'It's an economically viable project,' " he says.
The annual operating budget for the three major ferry routes a fixed link would replace is $253.5 million.
Issues? Start counting
There are "extreme" waves of up to seven metres, tides of six metres, earthquake threats and wind gusts up to 180 kilometres per hour.
Other traffic is also an issue. There is the risk of a tanker running into a bridge -- about 45,000 vessels use the strait annually. A contractor would need to dredge two channels at least 200 metres wide and 65 metres deep to accommodate those vessels.
Underwater landslides are possible because of potential instabilities on the mainland marine slope.
DEEP WATER
The Strait of Georgia is 10 times deeper than the water crossed by Prince Edward Island's Confederation Bridge to New Brunswick.
The ocean there is 35 metres deep over a rock bottom, versus 365 metres of water and just as many of mud in the Strait of Georgia, says Sharlie Huffman, bridge seismic engineer with the Ministry of Transportation.
A bridge over the Strait of Georgia would run 24 to 26 kilometres, nearly 10 times as long as the $1.8 billion Rion Antirion Bridge in Greece, which is also in a seismic zone with deep sediment. But the Greek bridge is in water only 65 metres deep.
A fixed link is possible in theory, Nyland says, but "in practice, while the technology seems to be there, it's never been used that way before."
So what about a floating bridge?
"There are no fixed bridges in existence today that would meet the conditions present in Georgia Strait," the 2002 government report says.
Floating bridges have only been used on short distances, Nyland says, giving as an example the 2.3-kilometre bridge that runs from Seattle to Mercer Island in Washington state.
High winds and heavy shipping on 25 kilometres of open water are big problems. Anchor cable hundreds of metres deep could affect whales and fishing, Nyland adds.
Even if financing were in place today, a bridge would take at least five years of planning and six to 10 years to build.
"No one is going to build such a thing," says Guy Dauncey, president of the B.C. Sustainable Energy Association.
There might also be resistance to a fixed link that would connect Vancouver Island to the rest of the province. After all, it raises the spectre of regular commuters from the mainland who might make Island communities suburbs of Vancouver.
kdedyna@tc.canwest.com