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posted 04/06/10 09:41 AM | updated 04/06/10 11:44 AM
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520 Light Rail Option Proves to be Great Argument Fodder

By Michael van Baker
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Mayor McGinn

As the Seattle Times sums it up, "Lawmakers decided three years ago on a bridge configuration--two general lanes and one lane for carpool and bus traffic in each direction--and left the option of light rail to be decided in the future."

However, since it's not so easy to slap a light rail on a bridge once it's built--and this is talked about as a 75- to 100-year bridge--Mayor McGinn has been pushing for light rail on 520 on its opening day. (That collective, Peanuts-y AAUGH! you hear in the distance is from everyone who's worked on getting the project this far.)

This morning at 11 a.m., McGinn is to announce the results of his own consultant's report on the advisability of adding light rail to 520, but KING 5 jumped the gun with a sneak preview. Says KING:

The draft report from Nelson/Nygaard Consulting Associates concludes that the plan for light rail on I-90 should proceed, but "the focus of the effort on 520 should... not replace the current planning and design underway."

Untrue! says McGinn's office. Here's the full quote from the report:

"Sound Transit’s current project to construct light rail to the Eastside over I-90 should continue unabated.  The focus of effort on SR 520 should be assessing the potential to add a second cross-Lake Washington LRT corridor, not to replace the current planning and design work underway."

Not exactly earth-shattering, but it would be nice, while the state is making vague promises about adding light rail sometime later when it's convenient, to be sure that light rail is actually a possibility given the new bridge's design. UPDATE: Publicola quotes McGinn at his press conference saying, "The corridor as currently designed virtually precludes light rail in the future." But the report also says planning for light rail on 520 would take five years. Sigh.

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Lessons from the Tunnel
Didn't we learn anything from the Downtown tunnel?

When they built that, they made a big deal about making it "Light Rail" compatible. 10 years later when light rail was ready to put it, lo and behold, the tracks that were installed were not compatible with the light rail being put into place, and it needed to be completely re-done.

Tell me why this is different.
Comment by Frank
2 days ago
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RE: Lessons from the Tunnel
It's different because they could have left the tracks out, and the tunnel would still have been structurally "light rail compatible." I.e., you can fit a train in it.

As the design stands, the 520 A+ option isn't structurally compatible. Rails or not, the lane width wouldn't work for light rail, and the bridge itself may not be able to take a train's weight.

What wouldn't be different is that if this isn't addressed now, 520 may need to be completely redone for light rail to work.
Comment by Michael van Baker
2 days ago
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