Highest and Lowest Interstate

[Voyager]

I believe that 70 in Co is the highest Interstate, but what's the lowest one?

[un1]

The highest point on the Interstate Highway System is at the Eisenhower Tunnel on Interstate 70 in the Rocky Mountains of Colorado, at the Continental Divide (elev. 11,158 ft/3,401 m).

The lowest point on land is on Interstate 8 at the New River near Seeley, California (elev. -52 ft/−16 m).

The lowest point under water is on Interstate 95 in the Fort McHenry Tunnel under the Inner Harbor in Baltimore, Maryland (elev. -107 ft/−33 m).

Source: Wikipedia

[jd2death]

Interstate 8 at the New River near Seeley, California

[ComputerGuy]

What's the Highest and Lowest Interstate in each state?

[Chris]

Highest Interstate east of the Mississippi is the I-80 in Pennsylvania, if I remember correctly.

Might the upgrading of NY-17 into I-86 cause the I-86 to be higher?

[Bryant5493]

In Georgia, the highest numbered interstate is I-985, which connects I-85 with Gainesville (GA).

The lowest numbered interstate in the aforementioned state is I-16, which connects Macon and Savannah.

Be well,

Bryant

[Voyager]

California's highest is probably Interstate 80 over the Donner pass.

[agentsteel53]

that is correct.  about 3000 feet higher than I-5 and I-15 over the San Gabriels, and I-8 near Alpine. 

now if they ever make an interstate out of US-395, then Conway Summit will be the highest.

[Bryant5493]

Oh, the question is highest in terms of elevation, not interstate highway number. My bad. 

Be well,

[Freewayjim]

Highest Interstate east of the Mississippi is the I-80 in Pennsylvania, if I remember correctly.

Might the upgrading of NY-17 into I-86 cause the I-86 to be higher?

I-80 in PA is higher than I-93 in Northern New Hampshire or I-91 in Northern Vermont?

If so I'm shocked.

[Chris]

Otherwise this sign is wrong:


edit: it's only about I-80. Perhaps other Interstates are higher...

[Duke87]

I-80 in PA is higher than I-93 in Northern New Hampshire or I-91 in Northern Vermont?

Poking around Google Earth indicates:

- I-87 getting upt to 1300 feet or so at a couple spots in the Adirondacks, but that's it.
- I-89 peaking at about 1700 feet south of Northfield, VT
- I-91 peaking at about 1900 feet north of Sheffield, VT
- I-93 peaking just shy of 2000 feet in Franconia Notch
- NY-17/I-86 peaking just above 2100 feet west of Karrdale

So that neck of the woods doesn't beat I-80.

However, I-64 gets up to about 2450 feet at the VA/WV line, so we can prove by counterexample that I-80 there is not the highest point on any interstate east of the Mississippi.

As to whether that one on I-64 is the highest... I don't know. I'm not running my mouse pointer along every interstate in the Appalcacians.

[Tarkus]

In Oregon, the high point would have to be Interstate 84 near Meacham, Oregon, if I'm not mistaken.  In Washington, it's Interstate 90 over Snoqualmie.  Though I believe Interstate 90 over Lookout Pass on the Idaho/Montana border has them all beat for the Northwest.

Lowest point is obviously on I-5 somewhere in the valleys, as evidenced by the flooding the past couple winters.

-Alex (Tarkus)

[deathtopumpkins]

I've been over that pass on I-64 several times and don't remember there being any sort of a sign saying it was the highest... Whoops... nevermind, wrong interstate. 

[Alex]

Interstate 90 eastbound at Snoqualmine Pass.



Interstate 91 in northeastern Vermont.

[algorerhythms]

I-80 in PA is higher than I-93 in Northern New Hampshire or I-91 in Northern Vermont?

Poking around Google Earth indicates:

- I-87 getting upt to 1300 feet or so at a couple spots in the Adirondacks, but that's it.
- I-89 peaking at about 1700 feet south of Northfield, VT
- I-91 peaking at about 1900 feet north of Sheffield, VT
- I-93 peaking just shy of 2000 feet in Franconia Notch
- NY-17/I-86 peaking just above 2100 feet west of Karrdale

So that neck of the woods doesn't beat I-80.

However, I-64 gets up to about 2450 feet at the VA/WV line, so we can prove by counterexample that I-80 there is not the highest point on any interstate east of the Mississippi.

As to whether that one on I-64 is the highest... I don't know. I'm not running my mouse pointer along every interstate in the Appalcacians.

I-68's highest point is around 2800 feet, at Keyser's Ridge.

[Alex]

Interstate 90 west at Lookout Pass (ID/MT border)

[agentsteel53]

is that the highest point on the 90?

[Alex]

*shrug*, you should know, considering that you've done most of it 

[agentsteel53]

all of it.  when I was doing my research for my Wisconsin trip a few months ago, I realized I had done it all in Wisconsin, as well as the Illy toll road section, and therefore I had clinched it.

so I clinched 43 while I was up there instead.

[ComputerGuy]

What's the lowest interstate in WA?

Highest: I-90 at Snoqualmie Pass

[agentsteel53]

What's the lowest interstate in WA?

Highest: I-90 at Snoqualmie Pass

Probably I-90 across across the Lake Washington Bridge.

[Voyager]

Wonder what they are in Kansas?

[agentsteel53]

Wonder what they are in Kansas?

low in the east, high in the west.  Kansas rises steadily.

I'm figuring the highest point is I-70 near the Colorado border, and the lowest is somewhere in the KC area.

[SSOWorld]

Highest point in the Nation?  I-70 (Eisenhower Tunnel in Colorado)

Lowest point in the Nation? My guess is I-8 in the Imperial Valley, California.