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Best Engineering for an Interstate Highway

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Nominations are open.

Considerations for environment, preserving scenery, as well as novel thinking into design.

Many have mentioned 1-70 from the Ike Tunnel to the Utah border as a wonder in engineering.  This highway is not unique as there are many similar designs, albeit not as long or complex.  Consider these "canyon" interstates that I have personally travelled on:

I-15 north of Helena, MT.  I remember the construction of this portion and was impressed with how it all came together.

I-84, the Columbia Gorge.  This freeway has evolved over the decades.  The railroads owned much of the land right next to the Columbia River forcing roadway builders up above the river along the cliffs.  Many sections of the original two lane Gorge Highway built along the cliffs are now closed to auto traffic and make outstanding bike and hiking trails.

I-90, the western approach to Snoqualmie Pass in WA State.  The eastbound lanes occupy the previous 2x2 US-10 along the south side of the valley.  The newer westbound lanes utilize a mile long viaduct over the avalanche prone north side of the valley.

I-90, Wallace, ID.  The town occupied the valley so the freeway was built on the hill above the town with viaducts that almost "fly over" the town.  Not to mention the portion in the same area that also was built to bypass Lake Couer 'd Alene.  The old highway along the lake is now a boulevard with little traffic and a favorite of strollers, bikers, and skaters.

I-93 through Franconia Notch, NH.  One of the few places an Interstate Freeway is reduced to "super 2" status (this may not be the case now as it was when I drove it).  Got to see the "Old Man" before it slid off the mountainside a few years back.

There are probably many other places where geography and engineering meet to create scenic and spectacular roadways.  I open it up to the forum....

I-70 through Glenwood Canyon.  some piece of work.  having to tunnel at times, and build on the side of a cliff (having WB lanes higher than EB to reduce the space used by the road.  beautiful scenery for an interstate - painted the same color as the cliff to have it blend in somewhat.  Worked at a Dam on the Colorado for two weeks installing generator equipment (as a contractor) - it was right under the interstate.

I think GDOT did a good job with the Wayne Shackelford Interchange (I-85/Veterans Parkway @ S.R. 316/University Parkway).

Also, I like the Buford Highway (U.S. 23/S.R. 13) and Pleasant Hill Road interchange.

Be well,


In Philadelphia: Interstate 676 (Vine Street Expressway) and Interstate 95 (Delaware Expressway) by Penn's Landing, both built below grade with cut and cover tunnels supporting urban parks.

hmm. I'll say the I-10/U.S. 61/S. Carrollton interchange in NOLA.

It was built over an already existing complex interchange and railroad tracks, then incorporated into the interchange and one of the streets below without removing or changing any of the existing structures.

Not sure if that counts, but I'm fascinated with the thing


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