Interchanges over water?

[Dustin DeWinn]

I only know of one, in New Bern, NC. Do you know of any road interchanges over water? The more complex / more levels the better.

[CardInLex]

I-95 at I-395 in Baltimore is completely over water.

https://goo.gl/maps/w1npzq9prvHme75Z9

[CtrlAltDel]

Here are a few that I've come across:


The terminus of I-110 at US-90 in Biloxi MS.


I-10 at US-98 near Mobile AL.


I-395 at I-95 in Baltimore MD (as mentioned above).

[BrianP]

Part of I-81 at Front St in Harrisburg PA
https://goo.gl/maps/hgGmBb31U1CVmFYQ9

[webny99]

Part of I-81 at Front St in Harrisburg PA
https://goo.gl/maps/hgGmBb31U1CVmFYQ9

Here's another Susquehanna example just 10 miles north on US 22/322!

[Bitmapped]

Part of I-79 Exit #65 at Neville Island, PA is over the Ohio River:
https://goo.gl/maps/rzjGwLgjwbYY13uK9

[jmacswimmer]

SC 30/SC 61 in Charleston - partially over water, partially over wetlands.

[jakeroot]

Washington has a couple examples, maybe more.

I-405 at Bellevue Way is partially built over a small inlet, but the whole area is a huge swamp (Google Maps); a bunch of the braided ramps between Bellevue Way and the 405 are over this swamp (if that counts):



There used to be this thing called the "WSDOT Peninsula", which was this area in Seattle owned by WSDOT, occupied by an abandoned partially-built freeway interchange (for the unbuilt RH Thomson Expressway). It has since been removed (Google Maps):


(image from Seattle Times ($))

[jakeroot]

For British Columbia: depending on how liberal we are being, the BC-91/BC-91A Queensborough Connector interchange straddles the Annacis Channel, just off the Fraser River:

https://www.google.com/maps/@49.1752333,-122.9571551,1082m/data=!3m1!1e3

The second bridge was built in 1997. Prior to this, only the eastern span was there, built as part of Hwy 91's construction in the 1980s (see here, shortly after opening).

[TheStranger]

Part of the Metro Manila Skyway Stage 3 alignment past San Juan and Quezon City runs in the San Juan River, including an onramp onto the northbound highway near the SM City Sta. Mesa mall:

https://www.openstreetmap.org/relation/106569#map=18/14.60442/121.02022

[Bruce]

The I-405 / SR 522 interchange in Bothell straddles part of the Sammamish River

[BridgesToIdealism]

Don't forget the near-identical twin to I-95/I-395 in Baltimore, which is I-10/I-310 outside of New Orleans. Not only is this three-level stack built entirely over water, it is built entirely over swamp, and in fact that entire three-level stack connects two of Louisiana's mega swamp bridges (The LaBranche Wetlands Bridge on I-310 and the Bonnet Carre Spillway Bridge on I-10).

[hotdogPi]

You (OP) asked the same question in 2018 here.

[Dustin DeWinn]

You (OP) asked the same question in 2018 here.

Apologies for that. Not my intention to shitpost or be redundant.

[jakeroot]

On the flip side, there are several mentioned here not mentioned in the first thread. So the duplication wasn't entirely in vain

[jmacswimmer]

Here's another one not mentioned in the 2018 thread: The I-64/I-664 interchange in Hampton VA is partially over some water & wetlands.

[lepidopteran]

The I-195/I-295/NJ-29 interchange near Trenton is partially over water.  More of a swamp/wetlands actually, but part of one loop and all of a "straight ramp" is on stilts.

[Revive 755]

I-74 at I-280 in Quad Cities has two of the north side ramps extending a little bit into the Rock River.

I-255 at IL 157 has a loop ramp on structure that crosses a channel of some sort twice.

[CtrlAltDel]

I-255 at IL 157 has a loop ramp on structure that crosses a channel of some sort twice.

It's definitely not quite on the same level as some of the others here, but I always thought it was interesting that the loop ramp from Epcot Center Drive to Buena Vista Drive at Disney World used to cross a drainage channel twice. (It's gone now, though.)

[andrewkbrown]

https://www.google.com/maps/@38.794351,-77.0559013,971m/data=!3m1!1e3
Just north of me, Capital Beltway and US 1.

[ilpt4u]

https://www.google.com/maps/place/41%C2%B045'38.0%22N+89%C2%B047'01.3%22W/@41.7605603,-89.7858712,783m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d41.7605603!4d-89.7836825?hl=en-US

One of the Trumpet ramps at IL I-88's Exit 36 goes over a creek. The interchange is also near the Rock River, but the roadways do not cross the river at the exact spot of the interchange

The Tumpet interchange itself is essentially a long exit ramp to US 30 at a Wal-Mart Distribution Center, west of Sterling

[Dirt Roads]

The Fort Hill interchange on I-64 in Charleston, West Virginia (Exit 58A/US-119) has its northernmost ramps over the Kanawha River.  The next exit (Exit 58B/Virginia Street West) has its southernmost ramps starting right over the northern bank of the river.  Hop over the next exit, and the split for I-64/I-77 (which is actually Exit 101 on the I-77 numbering) occurs over the smaller Elk River.  [Sorry, I would post the link but Ducky doesn't keep the coordinates

Fort Hill Interchange (using Ducky):
https://duckduckgo.com/?q=I-64+at+US-119+wv&t=h_&ia=web&iaxm=maps&strict_bbox=0&bbox=38.00491138058485%2C-81.35686725211485%2C37.995928227743654%2C-81.33839414788517

I'm not quite sure, but I believe that the southernmost ramps for Virginia Street exit was mostly over water when they were constructed.  The small river channel for Magic Island was filled in to create a park, and it looks like this extends eastward under the Interstate.  I'm pretty sure that they also raised the elevation of Magic Island when the Corps of Engineers replaced the Winfield Locks with a bypass and raised the river elevation back in 1997.  Before all of this, Magic Island was just barely above the mean river elevation and would frequently disappear whenever water levels rose (or were held back).

[Buck87]

I-95 at I-395 in Baltimore is completely over water.

https://goo.gl/maps/w1npzq9prvHme75Z9

I can't think of this interchange without also thinking of this movie scene where the 4th verse of the Star Spangled Banner is being sung at the start of a Super Bowl that is about to get nuked

https://www.youtube.com/watch?v=WKiBrm5_fjQ

[ftballfan]

I-96 and M-6 just east of the Grand Rapids airport is partially over the Thornapple River: https://www.google.com/maps/@42.8883035,-85.489125,1158m/data=!3m1!1e3?hl=en

[Bickendan]

I-84/US30 at I-5:
https://goo.gl/maps/ffcM4Srx6c7jw2Ln7

Morrison Bridge at I-5:
https://goo.gl/maps/dsnaMyt4Aixr1Gyx7

I-5 at what would have been I-80N (and US 26) [Mt Hood Frwy] would have qualified:
https://goo.gl/maps/DBQYMEgQM14pqiPZ6

US 26 at OR 99E:
https://goo.gl/maps/ri6KUGHEuyq8Qj4A6

I-5 at SW Nyberg Rd (technical):
https://goo.gl/maps/UxXRNbZE9KykDBGX9