Newest System Interchange in Each State

[triplemultiplex]

For fun I've begun compiling a map of each state's "newest system interchange."  Fills, corrections and discussion welcome.  Naturally, this is just a first draft and I'll make updates as time goes on.



Tough to say for sure what year something opened in many cases since there are many interchanges where part of it opens one year, and the rest later.

I'll comment about Rhode Island right at the top.  Since that interchange was so dramatically relocated, I consider it "new" rather than just another rebuild.
And yes, I know I'm getting ahead of the game on I-295.  Hell, I'm not even sure that's the right answer for the Tar Heel State.

[Beltway]

I-264 and VA-164 MLK Freeway, Portsmouth, in 2016.

[jeffandnicole]

For fun I've begun compiling a map of each state's "newest system interchange."  Fills, corrections and discussion welcome.  Naturally, this is just a first draft and I'll make updates as time goes on.



Tough to say for sure what year something opened in many cases since there are many interchanges where part of it opens one year, and the rest later.

I'll comment about Rhode Island right at the top.  Since that interchange was so dramatically relocated, I consider it "new" rather than just another rebuild.
And yes, I know I'm getting ahead of the game on I-295.  Hell, I'm not even sure that's the right answer for the Tar Heel State.

For PA, it's 95/276, not 95/476.

[Roadsguy]

I suppose DE's current newest before the new 301's opening would be DE 1 and the Puncheon Run Connector, technically a distinct freeway. Otherwise, it would be whichever junction between I-95 and 495 was built later.

[sparker]

If the definition of a "system connector" is exclusive to full limited-access freeways, then the border-hugging CA 905/125/11 interchange cited earlier would certainly be CA's most recent -- and likely to be the last completely new one deployed until such time as the CA 58/Westside freeway connects to I-5.  However, if the term could be extended to controlled-access facilities, such as expressways with local grade crossings but periodic interchanges, such as the CA 111/78/86 corridor from I-8 north to I-10 in Imperial and Riverside counties, things might be changing close to home (San Jose), thanks to the continuation of the gas tax increase.  I've gone into detail about this in another thread, but there may be two system interchanges as part of the same project -- the upgrade of CA 25 to an expressway (with periodic interchanges) from Hollister north to its US 101 terminus, which will be rebuilt as a free-flowing facility -- but as a bonus (if funds allow) a 2nd interchange with a rerouted CA 152 extending east from CA 25 to the present 152/156 "split" may be at least partially constructed as part of the overall CA 25 project.  The 101/25 interchange will likely be a large-radius trumpet, while a 25/152 divergence will probably, because of the proximity of the CA 156 connector from just north of Hollister to EB 152, be a directional wye.  If deployed in this fashion, the section from US 101 to the 25/152 split would be co-signed with both route numbers; CA 152 would then multiplex north with US 101 to access its Hecker Pass extension west to Watsonville.  The present accident-prone 2-lane segment of CA 152 from Gilroy to CA 156, where its expressway segment over Pacheco Pass begins, will be relinquished to Santa Clara County.   

[jakeroot]

Need another local to confirm, but 99% sure WA is I-90/I-5 (1990), assuming "system interchange" only applies to freeway-to-freeway interchanges that have free-flow ramps.

If freeway-to-freeway is the only requirement, free-flow-be-damned, it would be WA-509/I-705 (1995).

[Scott5114]

Oklahoma's will change in the next few years to be the interchanges at either end of the Eastern Oklahoma County Turnpike, or Kilpatrick Turnpike/SH-152.

[abefroman329]

GA is I-85/GA-400 (1993).

[kphoger]

If freeway-to-freeway is the only requirement, free-flow-be-damned, it would be WA-509/I-705 (1995).

I wouldn't necessarily require a "system" here to be a full freeway, but WA-509 pushes the definition of a freeway, considering there's an at-grade intersection and a level railroad crossing less than 5 miles east of I-705.

[vdeane]

For fun I've begun compiling a map of each state's "newest system interchange."  Fills, corrections and discussion welcome.  Naturally, this is just a first draft and I'll make updates as time goes on.



Tough to say for sure what year something opened in many cases since there are many interchanges where part of it opens one year, and the rest later.

I'll comment about Rhode Island right at the top.  Since that interchange was so dramatically relocated, I consider it "new" rather than just another rebuild.
And yes, I know I'm getting ahead of the game on I-295.  Hell, I'm not even sure that's the right answer for the Tar Heel State.

As mentioned, for NY it's I-81/I-781 (2012).

[bzakharin]

In NJ, If we're talking about a free-flowing interchange between two freeways, The exit from the Atlantic City Expressway East to the Garden State Parkway South has just been rebuilt to be taken without slowing below 65 MPH, and having 2 lanes throughout. The other movements still don't have this, however.

[jakeroot]

If freeway-to-freeway is the only requirement, free-flow-be-damned, it would be WA-509/I-705 (1995).

I wouldn't necessarily require a "system" here to be a full freeway, but WA-509 pushes the definition of a freeway, considering there's an at-grade intersection and a level railroad crossing less than 5 miles east of I-705.

Yeah, I suppose comparing the 509 to something like an Interstate, it's rather unimpressive. Some of WSDOT's newer non-Interstate freeways haven't been too impressive in terms of shoulder and lane width, interchange geometry, etc.

I usually go off two things when considering something as freeway: at least 55 speed limit, and designated as freeway on state maps. 509 is 60 MPH, and is a freeway on WSDOT's online map.

All that in mind, I would really appreciate triplemultiplex coming in and saying exactly what the requirements are, since I'm still unsure. Freeway-to-freeway with free-flow interchange? free-flow interchange between any two roads? Freeway-to-freeway with some signalized movements?

[Eth]

I usually go off two things when considering something as freeway: at least 55 speed limit, and designated as freeway on state maps. 509 is 60 MPH, and is a freeway on WSDOT's online map.

By that standard, much of I-20 in Atlanta wouldn't be a freeway, nor would most of Hawaii's Interstates.

[jakeroot]

I usually go off two things when considering something as freeway: at least 55 speed limit, and designated as freeway on state maps. 509 is 60 MPH, and is a freeway on WSDOT's online map.

By that standard, much of I-20 in Atlanta wouldn't be a freeway, nor would most of Hawaii's Interstates.

Should have added "*or is an interstate" and "*in WA"...I know that a lot of eastern states post less than 55 on freeways, which is pretty rare out west.

[hbelkins]

West Virginia's is probably the I-77/I-64 interchange at Beckley. If a new interchange had been built at I-68 and the Mon-Fayette Expressway, it would count, but it doesn't. They simply modified the existing CR 857 interchange and tied the four-lane WV 43 into it.

[triplemultiplex]

Perhaps this map of what I consider to be "system interchanges" in Wisconsin will help.




And an updated national map


Some of the dates for states like the Dakotas and Montana are going to be original interstate construction; perhaps even from the 60's.

[J N Winkler]

I would not consider "KS 10/32nd St" (presumably K-10/23rd Street is meant) to be a system interchange in general, let alone to the specific criteria outlined in the OP that seem to be aimed at excluding phased construction.  It is a three-level wye and all movements are free-flowing, but it does not connect two freeways.  The SLT to the west is a simple extension of the older K-10 freeway and 23rd Street is a surface arterial.

[froggie]

^^ 3MX, did you miss my comment on the first page (regarding Vermont)?

[roadfro]

For Nevada, it will depend on how picky you are with the definition...

I-15 & I-215/CC-215: Opened 1996
This was a completely new interchange built with the construction of the then-new Las Vegas Beltway.

I-215 & I-515/US 93/US 95 & SR 564: Opened 2006
When the Las Vegas Beltway was originally constructed in this area circa 1999, it was built on top of what was then SR 146/Lake Mead Drive. But I-215 and the freeway standards ended just west of Gibson Road (about a mile west of the current system interchange), so 215 beltway traffic accessed I-515/US 93/US 95 via SR 146/Lake Mead Drive (a surface arterial) at the then-existing signalized diamond interchange. NDOT completed the construction of the I-215 freeway mainline and the all the free-flow interchange ramps in 2006. So while there has been an interchange at this location since the early 1990s, everything about the current interchange and ramp configurations dates to 2006 (except for the existing I-515 mainline & 215/564 undercrossing).

[Stephane Dumas]

If we add the ones above 48 states.

Quebec, a new Turcot interchange will replace the current one where A-20 meet A-720 and A-15.

A-30 with A-530, A-440 with A-25 when the missing gap of A-25 was finally completed.

Ontario, the newest ones are Hwy-401/412, Hwy-407/412 and soon Hwy-401/418 and Hwy-407/418.

[hbelkins]

I wouldn't consider US 23/OH 823 to be a "system interchange," given that this is a freeway that connects two surface routes at either end. There are at-grades on US 23 within close proximity to the end of the Portsmouth bypass.

[vdeane]

If we add the ones above 48 states.

Quebec, a new Turcot interchange will replace the current one where A-20 meet A-720 and A-15.

A-30 with A-530, A-440 with A-25 when the missing gap of A-25 was finally completed.

Ontario, the newest ones are Hwy-401/412, Hwy-407/412 and soon Hwy-401/418 and Hwy-407/418.

Given that the old Turcot was already freeway-freeway, that one doesn't meet the thread criteria.  Of the other Québec ones, the A-30 one is newer.  I don't recall if I-30 opened in phases or not - if not, A-730, A-15, and A-930 are also contenders; of those, A-30/A-15 is the most major (albeit a partial replacement for A-930/A-15, since A-930 is former A-30, along with A-730 and A-530).

Technically ON 407/ON 418 is already "open", though I'd hardly count it in its current state, since it's acting as the through lanes of ON 407 to its temporary terminus right now.

NB - NB 11/NB 15 (2018?)
NS - ???
PEI - no freeways, but there is an interchange between TCH 1 and PE 1A
NL - ???
MB - no freeways, but MB 101/MB 59 (2018) fulfills the spirit of this thread
SK - ??? (the Regina Bypass will have one eventually)
AB - ???
BC - may have been mentioned upthread
YT/NT/NU - N/A

[SSOWorld]

Perhaps this map of what I consider to be "system interchanges" in Wisconsin will help.




And an updated national map


Some of the dates for states like the Dakotas and Montana are going to be original interstate construction; perhaps even from the 60's.

Technically I-41/WIS-29 is Incorrect.  WIS-29 leaves the freeway at Packerland Drive prior to the Interchange and continues under into town while WIS-32 continues on the freeway.  So WIS-32 is the intersecting route.  WIS 29 is still justifiably marked on I-41 due to the long distance and dominant pathing.

[thenetwork]

For Ohio, I believe it is probably the two interchanges of US-23 and US-30 near Upper Sandusky, at either end of their concurrency.

What year did those get built?  the latest ones I thought of in Ohio were I-77 at the Ohio Turnpike/I-80 in the late 90s or I-80 and SR-711 in Youngstown in 2006.  Both were already opened partial intersections, but in the case of I-77/I-80 they extended the turnpike ramp from SR-21 to I-77.

[triplemultiplex]

See I don't think the intersecting highways need be full freeways for it to be a system interchange.  For me, it's more of a description of the interchange itself, regardless of what feeds it.  So I guess that means I would consider a full cloverleaf interchange between a freeway and an arterial suburban street to be "system".  So a rural expressway like US 23 is certainly major enough.

Technically I-41/WIS-29 is Incorrect.  WIS-29 leaves the freeway at Packerland Drive prior to the Interchange and continues under into town while WIS-32 continues on the freeway.  So WIS-32 is the intersecting route.  WIS 29 is still justifiably marked on I-41 due to the long distance and dominant pathing.

Yes, yes.  But no one thinks of it as WI 32.
I also personally dislike the endlessly multiplexing route of WI 32, so I definitely think of that junction as I-41/WI 29.
Side note about WI 32; ever since they jumped on the connection to some old civil war regiment based solely on the happenstance of both having the number 32, now it feels like it would be 'sacrilegious' to break that highway up into the 3 routes it should be. I have a nagging thought of hearing, "Oh you're going to break up WI 32? Why do you hate the troops!?"