Permanently Grounded Interstates

[Mapmikey]

Not for their inappropriate behavior...

As a converse to the recent elevated interstates thread, what is the longest interstate that crosses no bridges at all?

Virginia has I-381 (1.14 mi)

Mapmikey

[hotdogPi]

These both go under every other road:

MA 213, although it's not an interstate.
I-95 in New Hampshire goes under every route. Some non-routes don't though, and this isn't all of I-95.

This is ignoring rivers.

[getemngo]

I'm mildly disappointed to find that I-180 in Wyoming does not fit the bill. 

But yeah, "does not cross over any roads" (entirely depressed) would make for a longer discussion than "has no bridges."

[Beeper1]

I-95 in New Hampshire goes under every route. Some non-routes don't though, and this isn't all of I-95
This is ignoring rivers.

I think I-95 in NH passes over the Spaulding Turnpike/US-4, and a couple of local roads in Portsmouth.

[hotdogPi]

I thought "grounded" already meant it could pass under.

[deathtopumpkins]

In addition to a multitude of small rivers, 95 also crosses over a minor road near NH 27/101, railroad tracks a mile and a half before the Turnpike split, the northbound Spaulding Turnpike ramps, the Spaulding Turnpike approach to the Circle, Woodbury Ave, Maplewood Ave, Market St, and then more railroad tracks and industrial driveways as part of the Piscataqua Bridge. So it's out.

[hotdogPi]

I have only gone up to exit 4. I didn't realize there were lots of exceptions past that.

[vdeane]

I-878 fits the criteria perfectly.  It's also the shortest interstate and not signed.  I think these are all related

Depending on how tunnels count, I-78 in NY as well.  And I-478.  I'm seeing a pattern here.

I'm mildly disappointed to find that I-180 in Wyoming does not fit the bill. 

But yeah, "does not cross over any roads" (entirely depressed) would make for a longer discussion than "has no bridges."

I-587 does though, if you don't count the river.

[andy3175]

I'm mildly disappointed to find that I-180 in Wyoming does not fit the bill. 

But yeah, "does not cross over any roads" (entirely depressed) would make for a longer discussion than "has no bridges."

Interstate 180 in Wyoming passes over Deming Drive (just north of the Interstate 80 interchange) and the Union Pacific Railroad yard in Cheyenne.

Regards,
Andy

[31E]

I-270 Spur in Maryland is 2.1 miles long and it goes under every road.

[TEG24601]

I-375 in Detroit is entirely depressed, with M-3 and I-75 passing over it, and it ending on the surface at M-10, near the Renaissance Center.


I-705 in Tacoma I believe is surface only for its entire length, but I could be wrong.

[SteveG1988]

Except for a few creeks I-195 in NJ just has over/underpasses

Does it count if it is at a state line and has a bridge there? if not, I-95 in delaware, or I-495 in DE

Going with the state line thing, I-676 only crosses a river once, at I-76 and the suchkyll river, between there and I-95 all crossigns are overpasses with 676 being depressed

[Kacie Jane]

I-705 in Tacoma I believe is surface only for its entire length, but I could be wrong.

Very few (but not 0) roads pass underneath it -- and most of those that do are near its termini -- but it does have some elevated portions even with out those.

[Alps]

Except for a few creeks I-195 in NJ just has over/underpasses

Does it count if it is at a state line and has a bridge there? if not, I-95 in delaware, or I-495 in DE

Going with the state line thing, I-676 only crosses a river once, at I-76 and the suchkyll river, between there and I-95 all crossigns are overpasses with 676 being depressed

you clearly have not read the original question

[roadman65]

I-4 from FL 44 to US 92 (Exit 129) in Volusia County, FL is almost 11 miles without any crossings of any kind.  That is the longest I know of regionally where I live.