States with discontinuous Interstate networks

[ran4sh]

Which of the contiguous 48 states have Interstates that are discontinuous from other Interstates in the same state?

One obvious example is Nevada with I-15 (and 215, 515, 11, etc) and I-80 (and 580), which are both Interstates but do not have any Interstate connection within Nevada (you have to go to Utah or California if you want to stay on Interstates going from Las Vegas to Reno).

Another example is Georgia, most of the Interstates connect within the state but I-24 and I-59 are separate, to reach them from I-75 (and the other Georgia interstates) requires passing through Tennessee.

[jp the roadgeek]

I-684 in CT
I-70 and I-470 as a package  in WV
I-86 redux in PA (the piece near Waverly)
I-44 in TX

[hotdogPi]

I-95 in New Hampshire
I-129 in Nebraska
I-27/40 in Texas
I-72 in Missouri
I-516 in Georgia

[Bruce]

Idaho: I-90

[JayhawkCO]

I-15 in Arizona
I-2/69s in Texas
I-535 in Wisconsin
I-95/495 in DC
I-81 in West Virginia

Not too long ago:
I-520 in South Carolina
I-585 in South Carolina
I-73/74 in North Carolina

Chris

[citrus]

Mississippi - 10 doesn't connect to anything else... intersections with 59 and 55 are in Louisiana.
Missouri - 72 doesn't connect to the rest of the state's network.
Tennessee - 155, until 69 connects, if it ever does...
New York - 78 stubs into Manhattan without any connections to the rest of the system.
Maybe Kentucky? I don't think 69/24/169 connect to the Eastern KY interstates yet, but I vaguely recall some newly designated 3dis that will fill in the gap.

Honorable mention... Washington DC, where 66 doesn't intersect the x95s.

[SkyPesos]

I-275 in Indiana

[ran4sh]

I-684 in CT
I-70 and I-470 as a package  in WV
I-86 redux in PA (the piece near Waverly)
I-44 in TX

In Texas I-40/27 is also separate from the other Interstates

[JayhawkCO]

I-684 in CT
I-70 and I-470 as a package  in WV
I-86 redux in PA (the piece near Waverly)
I-44 in TX

In Texas I-40/27 is also separate from the other Interstates

See post 3.

Chris

[ran4sh]

I-95 in New Hampshire
I-129 in Nebraska
I-27/40 in Texas
I-72 in Missouri
I-516 in Georgia

I-516 doesn't count, it connects to I-16

[index]

I-585 in SC, and formerly I-520 in SC (Edited onto a post by another poster just before I posted this? Around 8:34, wasn't my intention to mention these twice)
I-69C in TX (69E and 2 were mentioned, but not 69C)
Honorable mentions:
I-75 in the Upper Peninsula, analogous situation but still in the same state
I-84 almost entering NJ

[JayhawkCO]

I-585 in SC, and formerly I-520 in SC
I-69C in TX (69E and 2 were mentioned, but not 69C)
Honorable mentions:
I-75 in the Upper Peninsula, analogous situation but still in the same state
I-84 almost entering NJ

I-585 got extended north, so now it connects with I-85.

I put I-2/69s referring to the multitude of 69s down there, but great minds! 👍

Chris

[hotdogPi]

I-95 in New Hampshire
I-129 in Nebraska
I-27/40 in Texas
I-72 in Missouri
I-516 in Georgia

I-516 doesn't count, it connects to I-16

I don't know how I missed that. For some reason, I had remembered it as an Interstate that didn't touch any others at all.

[index]

I-585 in SC, and formerly I-520 in SC
I-69C in TX (69E and 2 were mentioned, but not 69C)
Honorable mentions:
I-75 in the Upper Peninsula, analogous situation but still in the same state
I-84 almost entering NJ

I-585 got extended north, so now it connects with I-85.

I put I-2/69s referring to the multitude of 69s down there, but great minds!

Chris

Huh. Looks like it did judging by its wiki page. When I checked Wikipedia's list of highways in SC just to make sure when I posted it, it didn't reflect that:  http://prntscr.com/1062pzv

It also looks like by coincidence your post was edited right before mine was posted. You could've edited it to mention the 69s but I wouldn't have been able to see it when I posted. So now we have all the 69s. Well, sans 69W as it connects to 35. Easy to miss that one, it hardly exists and its other siblings, which both meet the criteria of this thread, are so far away.

[US 89]

I-585 got extended north, so now it connects with I-85.

Do you have a source for that? I was just up there and I definitely got the sense that 585 did not make it all the way to 85. It connects through Business 85 for sure but there's definitely one at-grade intersection with a stoplight between the US 176 diamond interchange at I-85 and the I-585 freeway. In addition, the exit from 85 is currently signed "US 176 to I-585".

If 585 does connect all the way through to 85, that would make it a very rare example of an interstate with a signalized at-grade intersection.

[JayhawkCO]

I-585 got extended north, so now it connects with I-85.

Do you have a source for that? I was just up there and I definitely got the sense that 585 did not make it all the way to 85. It connects through Business 85 for sure but there's definitely one at-grade intersection with a stoplight between the US 176 diamond interchange at I-85 and the I-585 freeway. In addition, the exit from 85 is currently signed "US 176 to I-585".

If 585 does connect all the way through to 85, that would make it a very rare example of an interstate with a signalized at-grade intersection.

I've heard this website is good.. 

Chris

[Ryctor2018]

Mississippi - 10 doesn't connect to anything else... intersections with 59 and 55 are in Louisiana.
Missouri - 72 doesn't connect to the rest of the state's network.
Tennessee - 155, until 69 connects, if it ever does...
New York - 78 stubs into Manhattan without any connections to the rest of the system.
Maybe Kentucky? I don't think 69/24/169 connect to the Eastern KY interstates yet, but I vaguely recall some newly designated 3dis that will fill in the gap.

Honorable mention... Washington DC, where 66 doesn't intersect the x95s.

I-569 was signed into law last year. So, on paper the WKPY is now an interstate between I-69 & I-65. No telling how long it will take KY to make the necessary upgrades to sign it in the field.

[I-55]

Mississippi - 10 doesn't connect to anything else... intersections with 59 and 55 are in Louisiana.
Missouri - 72 doesn't connect to the rest of the state's network.
Tennessee - 155, until 69 connects, if it ever does...
New York - 78 stubs into Manhattan without any connections to the rest of the system.
Maybe Kentucky? I don't think 69/24/169 connect to the Eastern KY interstates yet, but I vaguely recall some newly designated 3dis that will fill in the gap.

Honorable mention... Washington DC, where 66 doesn't intersect the x95s.

I-569 was signed into law last year. So, on paper the WKPY is now an interstate between I-69 & I-65. No telling how long it will take KY to make the necessary upgrades to sign it in the field.

I remember it being designated up to I-165 but not past that. Did that change? Either way it would still connect to the rest of the state, just a little more crooked.

[Avalanchez71]

I-155 in Tennessee.

[NWI_Irish96]

I-535 in Wisconsin

[Flint1979]

Considering that the Mackinac Bridge isn't an Interstate or up to Interstate standards could I-75 in the U.P. be considered discontinuous even though the same highway exists in the Lower Peninsula. That's the only example of Michigan I could think of.

[GaryV]

Mackinac Bridge is still I-75, even though it isn't a freeway.

[sprjus4]

Future I-785 in Virginia

I-95 in North Carolina used to be until I-40 was constructed and connected to the route in the 1990s.

[bassoon1986]

Mississippi - 10 doesn't connect to anything else... intersections with 59 and 55 are in Louisiana.
Missouri - 72 doesn't connect to the rest of the state's network.
Tennessee - 155, until 69 connects, if it ever does...
New York - 78 stubs into Manhattan without any connections to the rest of the system.
Maybe Kentucky? I don't think 69/24/169 connect to the Eastern KY interstates yet, but I vaguely recall some newly designated 3dis that will fill in the gap.

Honorable mention... Washington DC, where 66 doesn't intersect the x95s.

I-569 was signed into law last year. So, on paper the WKPY is now an interstate between I-69 & I-65. No telling how long it will take KY to make the necessary upgrades to sign it in the field.

I remember it being designated up to I-165 but not past that. Did that change? Either way it would still connect to the rest of the state, just a little more crooked.

I-169 will be the Pennyrile Pkwy and I-165 will be the Natcher Pkwy.


iPhone

[hbelkins]

I-24 in Kentucky probably would have counted up until the time that I-69 was created. Even then, though, both legs of I-69 off I-24 end without a link to another interstate connection.