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Author Topic: Longest free bridge in the US  (Read 3360 times)

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Longest free bridge in the US
« on: December 31, 2013, 09:31:10 PM »

Since most very long bridges have tolls, I am wondering what the longest free bridge is.

It has to be free for cars in both directions.
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roadman65

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Re: Longest free bridge in the US
« Reply #1 on: December 31, 2013, 09:41:03 PM »

I would have to say either the Bridge to South Padre Island or the Hampton Roads Bridge Tunnel.
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Re: Longest free bridge in the US
« Reply #2 on: December 31, 2013, 09:45:24 PM »

It's the Manchac Swamp Bridge, on the the southern end of I-55 in Louisiana. In the US, only the Lake Pontchartrain Causeway is longer, and it's tolled.
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Re: Longest free bridge in the US
« Reply #3 on: December 31, 2013, 10:34:01 PM »

It's the Manchac Swamp Bridge
Yup. bridges don't always cross major rivers.
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Re: Longest free bridge in the US
« Reply #4 on: January 01, 2014, 02:05:45 AM »

I'd also say if it is a bridge only over water, the Virginia Dare memorial bridge is 5.2 mi long and connects the outer banks to the mainland.

https://en.wikipedia.org/wiki/Virginia_Dare_Bridge

Slightly longer is the I-10 twin span: https://en.wikipedia.org/wiki/I-10_Twin_Span_Bridge



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Re: Longest free bridge in the US
« Reply #5 on: January 01, 2014, 09:27:43 AM »

Technically speaking (and something we've had a thread about here in the past), one could start at the north end of the Manchac Swamp Bridge and go south on I-55, east on I-10, then south on I-310 to between US 61 and LA 48 (or vice versa) and be on bridge the entire time...a total of a little over 38 miles.
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Re: Longest free bridge in the US
« Reply #6 on: January 01, 2014, 12:22:50 PM »

I'd also say if it is a bridge only over water, the Virginia Dare memorial bridge is 5.2 mi long and connects the outer banks to the mainland.

https://en.wikipedia.org/wiki/Virginia_Dare_Bridge

Slightly longer is the I-10 twin span: https://en.wikipedia.org/wiki/I-10_Twin_Span_Bridge





There's always the 7-mile bridge in the Florida Keys...

For Virginia, both the US 17-258 James River and I-664 James River bridges are longer than the Hampton Roads Bridge-Tunnel. 

US 17-258 is longest at about 4.4 miles.

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Re: Longest free bridge in the US
« Reply #7 on: January 02, 2014, 05:08:18 PM »

Not as long as some of the others, but the Astoria–Megler Bridge is 4.1 miles long.

roadman65

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Re: Longest free bridge in the US
« Reply #8 on: January 02, 2014, 05:58:58 PM »

How could I forget about the 7 mile bridge?  I have been across it many times in my younger days.
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Re: Longest free bridge in the US
« Reply #9 on: January 02, 2014, 11:30:26 PM »


There's always the 7-mile bridge in the Florida Keys...
My first thought, indeed.
Technically speaking (and something we've had a thread about here in the past), one could start at the north end of the Manchac Swamp Bridge and go south on I-55, east on I-10, then south on I-310 to between US 61 and LA 48 (or vice versa) and be on bridge the entire time...a total of a little over 38 miles.
Since I'm an engineer, I have to be picayune - is it a "bridge" just because it's up on structure, or does it have to have a name to it as a defined set of spans? Could go either way, not sure what the thread is looking for.

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Re: Longest free bridge in the US
« Reply #10 on: January 06, 2014, 01:24:54 PM »

In Los Angeles, I-10 between I-110 and the East L.A. Interchange is on bridge rather than above-grade fill.

Just west of Sacramento, the Yolo Causeway bridges on I-80 are pretty long.
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Re: Longest free bridge in the US
« Reply #11 on: January 06, 2014, 03:04:17 PM »

In Los Angeles, I-10 between I-110 and the East L.A. Interchange is on bridge rather than above-grade fill.


similarly, the Alaskan Way viaduct in Seattle.
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