Sunday, August 21, 2011

Why is the Tappan Zee Bridge unnecessarily long?

You would never look at a map of the Hudson River, point to the spot where the Tappan Zee Bridge is, and say, "Put the bridge here!"

The Tappan Zee crosses one of the widest points on the Hudson — the bridge is more than three miles long. And if you go just a few miles south, the river gets much narrower. As you might expect, it would have been cheaper and easier to build the bridge across the narrower spot on the river. ...

There was an alternate proposal for a bridge at a narrower spot nearby. The proposal was put forward by top engineers at the Port Authority of New York and New Jersey.

But that proposal was killed by New York governor Thomas E. Dewey. The New York Thruway was his baby; in a 1954 speech he proclaimed that it would be "the world's greatest highway." ...

The Port Authority — the body that proposed putting the bridge further south — had a monopoly over all bridges built in a 25-mile radius around the Statue of Liberty.

If the bridge had been built just a bit south of its current location — that is, if it had been built across a narrower stretch of the river — it would have been in the territory that belonged to the Port Authority.

As a result, the Port Authority — not the State of New York — would have gotten the revenue from tolls on the bridge. And Dewey needed that toll revenue to fund the rest of the Thruway.

So Dewey was stuck with a three-mile-long bridge.

Today, the Tappan Zee is in bad shape, and the State of New York is looking into fixing or replacing it. But none of the proposals would move the bridge to a narrower spot on the river. It's too late now: Highways and towns have grown up based on the bridge's current location.

We're stuck with a long bridge at one of the widest spots in the river. The repairs are expected to cost billions of dollars.
--David Kestenbaum, NPR, on the enduring legacy of political ego and turf wars. HT: Marginal Revolution