Interstate Interchanges Built From Scratch

[Grzrd]

For NW metro Memphis, the new Long Range Transportation Plan sets forth a desired completion date of 2020 of an interchange connecting a new terrain section of I-69 to a new terrain section of I-269.  New terrain parent connecting to new terrain child.

Just north of Texarkana, TX, it is conceivable that an interchange connecting a new terrain section of I-49 to a new terrain section of I-x69 could be built in the next thirty years or so.  Connection of new terrain sections of unrelated interstates.

When was the last time each of these events occurred? Construction of a new interstate interchange connecting either (1) new terrain parent to new terrain child or (2) new terrain sections of unrelated interstates?

[NE2]

Perhaps I-75 and I-595 in the early 1990s.

[Mapmikey]

For Virginia, I'm going to go with the I-264/464 interchange which involved new terrain for I-464 and new sub-terrain for I-264, as the Downtown Tunnel was a 2-lane tunnel until the project to make I-264 an interstate through the tunnel and Berkley Bridge was completed in 1988.  I-464 was tied in shortly after in 1989.

Mapmikey

[triplemultiplex]

They're not interstates, but in the last decade, Wisconsin has constructed a couple system interchanges 'from scratch' per the requirements of the OP.

The cloverleaf between US 53 and WI 29 in Lake Hallie (Eau Claire suburb).
The directional Y at the eastern US 10/45 junction.
A trumpet interchange at the western US 10/45 junction.

The trumpet interchange under construction in Watertown between WI 26  & WI 16 east might qualify too.

One that would be a totally new interstate-interstate connection potentially is the junction of I-69 and I-530 in southern Arkansas.  That's all going to depend on the timeline of when that all comes together; whether I-530 will reach that far south by the time I-69 is under construction.

[hbelkins]

Not interstate, but West Virginia will be building an interchange between the Coalfields Expressway (US 121) and King Coal Highway (US 52).

Kentucky's newest such interchange is probably I-275 and I-471.

[Alps]

MS 304/713 - future I-69/269

[deathtopumpkins]

Closest thing I could think of in Massachusetts would maybe be the I-90/93 interchange at the southern end of the Big Dig, though it doesn't exactly meet the criteria. While I-93 already existed as the Central Artery, the road was completely rebuilt from scratch, part in a new location, and the extension of I-90 east from the interchange was from scratch.

Mass. is known more for tearing down existing interchanges now...

[Grzrd]

MS 304/713 - future I-69/269

If I were looking at this I would choose the V1-2 routing for a rail bypass and bridge, and the V1-1 routing for a new freeway bridge.

(codyg1985's quote is from "Southern Gateway Project: New Memphis Mississippi Bridge" thread on Mid-South page)

The V1-1 routing is described in the Southern Gateway Project Purpose and Need and Study Area Package (page 37/112 of pdf) as follows:

The southern section of existing I-69 extends west from I-55 just north of Hernando, MS and connects to
both the current MS-304 highway and the Old MS-304 highway approximately 12 miles west of I-55.
The roadway to the current MS-304 highway and interchange with US 61 forms a good connection point
for a new Southern Gateway corridor that would extend west ... [and] ... intersects I-40 approximately 2 miles east of the I-40/US 79 interchange.

If Cody turns out to be right and V1-1 is eventually chosen, this would create a variation where a freeway (MS 304)/interstate (I-69) interchange matures into an interstate/interstate interchange built from scratch since the MS 304 US 61-to-I-69 stub would presumably evolve into an I-x40 or I-x69.  Or, would it?  Would the evolution of the MS 304 stub into I-x40 or I-x69 necessitate modifications to the current interchange in order to become a full interchange that would disqualify it from the "interstate/interstate interchange built from scratch" category?

The I-85/I-185 interchange in Georgia seems like a similar interchange into which it could evolve.  I also believe the I-85/I-185 interchange was built from scratch.  Not entirely certain, however ...

[mightyace]

Again, not interstate to interstate, but...
West of State College, PA you have US 322 branching off from I-99/US 220 at a new interchange.

The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

[TheStranger]

The last time this actually happened in California...

Hmm, today's 80/5 junction (originally 880/5) in Sacramento's Natomas area was all new-build in the early 1970s.  Business 80/I-305 (originally I-80) and I-5 in downtown Sacramento was new-build ca. 1969

280/380 in the early 1970s in San Bruno

580/5 in Vernalis in the early 1970s

280/680 technically in the late 1970s in San Jose though that's more a seamless beltway number change that intersects US 101



605/210 in the 1960s?

805/15, I'm not sure that counts as the Wabash Boulevard freeway predates 805 (and 15 being extended through Murphy Canyon)

While 15 and 210 are new terrain routes and their interchange is only 5-6 years old, 15 predates 210 in that part of the Inland Empire by about 25-30 years

[roadman65]

Again, not interstate to interstate, but...
West of State College, PA you have US 322 branching off from I-99/US 220 at a new interchange.

The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

A.
The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

Huh? That was around years earlier.

[Revive 755]

Depending on whether the Illinois Tollway Authority decides to go for interstate numbers for the Elgin - O'Hare and O'Hare West Bypass routes, there could be a new from scratch interchange in about ten years where the two corridors connect.

[mightyace]

A.
The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

Huh? That was around years earlier.

Well, if it was completed, it wasn't open.  For many years there was a gap between 380 and 84 from the split east.

I admit however, it may have been completed earlier than I thought.

[PAHighways]

A.
The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

Huh? That was around years earlier.

Well, if it was completed, it wasn't open.  For many years there was a gap between 380 and 84 from the split east.

I admit however, it may have been completed earlier than I thought.

Construction began on the 84/380 directional-Y in 1975 and opened in 1978 as the last piece of the Interstate.

[TheStranger]

What really makes it hard to find California examples - so many of the freeways there were started pre-Interstate (or not built as Interstates at all), with few exceptions to that rule.

Based on what I've listed above ( https://www.aaroads.com/forum/index.php?topic=5978.msg131385#msg131385 )...

- San Diego only has four Interstate highways, of which I-8 and much of I-5 were originally US 80 and US 101 respectively, and parts of future I-15 were originally the municipal Wabash Boulevard freeway.  (I-15 north of Route 163 is ex-US 395)

- Los Angeles's scratchbuilt Interstates that were not signed something else beforehand:

10/Santa Monica Freeway (of the Interstates it intersects with, 405 in that area was Route 7, 110 was of course US 6/Route 11)

5/Golden State Freeway ONLY along the current concurrency with I-10 (north of there, was built as US 99 or US 99/I-5)

210/Foothill Freeway (I-15 and I-605 are the only from-scratch Interstates it connects to)

I-105/Century Freeway (I-605 is the only Interstate it intersects that was not another number previously)

I-605

- Bay Area:
280
380
the now-demolished 480, save for Doyle Drive which never was signed as such (only junction to an Interstate was I-80/then-US 40 and 50; was supposed to have a from-scratch interchange with post-1968 I-280)
580 southeast of 205 only
the short segment of 680 south of Route 262 (north of there, was an upgraded Route 21) to US 101
780 (both ends are at freeways that existed pre-Interstate: I-80/former US 40 and I-680/former Route 21)
980 (580/Macarthur Freeway was built as US 50)

One could argue that the new Cypress Freeway between 80 and 980 on 880 is new-build but 980's ramps connect to a segment of the Nimitz that was built as Route 17.

- Sacramento:

80 between West Sacramento and Foothill Farms, the former 880
Business 80 between (former) Route 275 in West Sacramento and E Street in midtown Sacramento, current unsigned 305/US 50/99/Business 80...and former I-80 (and US 99E between US 50 and E Street)
5

[mightyace]

A.
The I-84/I-380 interchange east of Scranton, PA wasn't completed until the 1980s, IIRC.

Huh? That was around years earlier.

Well, if it was completed, it wasn't open.  For many years there was a gap between 380 and 84 from the split east.

I admit however, it may have been completed earlier than I thought.

Construction began on the 84/380 directional-Y in 1975 and opened in 1978 as the last piece of the Interstate.

Thanks, for the correct info.  That's what I get for not doing my research before commenting.  Or is it just that I'm getting old?

[NE2]

Perhaps you're thinking of the reconstruction of the I-81/84/380 interchange to add US 6?

[cpzilliacus]

When was the last time each of these events occurred? Construction of a new interstate interchange connecting either (1) new terrain parent to new terrain child or (2) new terrain sections of unrelated interstates?

Not Interstate, but Maryland has recently completed (most of) the Md. 200 (ICC) interchange with I-95 in Prince George's County. 

[mightyace]

Perhaps you're thinking of the reconstruction of the I-81/84/380 interchange to add US 6?

No, I was thinking of the original construction of the I-84/380 junction.  I was just 7-8 years off in my recollection.

[national highway 1]

What really makes it hard to find California examples - so many of the freeways there were started pre-Interstate (or not built as Interstates at all), with few exceptions to that rule.

I-105/Century Freeway (I-605 is the only Interstate it intersects that was not another number previously)

I-605

Wasn't I-605 built as part of the pre-1964 CA 35?

[TheStranger]

What really makes it hard to find California examples - so many of the freeways there were started pre-Interstate (or not built as Interstates at all), with few exceptions to that rule.

I-105/Century Freeway (I-605 is the only Interstate it intersects that was not another number previously)

I-605

Wasn't I-605 built as part of the pre-1964 CA 35?

No:

http://www.kurumi.com/roads/3di/i605.html#605ca

Construction started in 1964, at which point the Route 35 designation had been moved to former  state Route 5 in the Bay Area (Skyline Boulevard in the Peninsula).

[KEVIN_224]

Does the work connecting I-95 and the Pennsylvania Turnpike north of Philadelphia count? I know it's supposed to complete I-95 from Maine to Florida once and for all.

[TheStranger]

Does the work connecting I-95 and the Pennsylvania Turnpike north of Philadelphia count? I know it's supposed to complete I-95 from Maine to Florida once and for all.

I think the criteria involves not only the interchange, but the roads themselves being built "from scratch" - the Pennsylvania Turnpike predates the Interstate system by some years.

[Stephane Dumas]

In the "close but no cigar" category.

I think the new interchange of A-30 and A-530 currently in construction at Salaberry-of-Valleyfield, SW of Montreal, seem to be the last freeway-to-freeway interchange built from scratch.

[mgk920]

The 'built from scratch' interstate-interstate interchanges in Wisconsin are:

-I-39/90/94 'Badger' interchange (Madison)
-I-43/94/794 'Marquette' interchange (Milwaukee)
-I-43/94/894 'Mitchell' interchange (Milwaukee)
-I-43/894 'Hale' interchange (Greenfield/suburban Milwaukee)
-I-90/94 'Tomah' interchange (Tomah)
-I-94/894 'Zoo' interchange (Milwaukee)

Mike