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Denver to Salt Lake City

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And I-70 going southwest makes the most sense for Denver<->Los Angeles and Denver<->Las Vegas traffic.

I-25 to I-80 is by far the best route for Denver<->SLC. Besides, you can't guarantee a road will be open. I-80 goes at 6,000 feet across Wyoming (or higher) while I-70 has two mountain passes (Vail and Eisenhower Tunnel) at over 10,000 feet. In the winter, unless you propose a 450-mi tunnel from Denver to SLC, there is no guarantee of an open route between the two.

Besides, for the traffic it gets, US 6 does a more than adequate job from Green River to I-70.


Building a freeway through the Price and Spanish Fork Canyons would be no more a challenge than that of building an I-70 through the mountains of Colorado.  I hear you guys and if I'm ever driving from Denver to Salt Lake City, I will probably drive north to I-80. 

To put an Interstate through mountain regions means having the resources to keep it open through all but the worst of winter storms.  I would imagine that I-80 through Wyoming is only marginally better during severe winter weather as I-70 is at the Eisenhower Tunnels or Vail summits.  Again, an I-72 from Green River through Price to Spanish Fork is only my idea for a fictional freeway, but one that still holds merit and is realistic looking into the future.

How does it add anything to the system though? We've already established it would save exactly SIX miles if routed along existing US 6 (and no more than 32 if somehow  you managed to build a freeway that pretty much runs diagonally direct from Salt Lake to Denver, which is geographically impossible), which is just not worth the hundreds millions of dollars and environmental damage it would cost under any circumstance.

We can't just go building freeways that require the investment of I-70 through Glenwood Canyon all willy-nilly. That corridor was built at incredibly huge expense because it served a clear and necessary purpose. A freeway through Price Canyon will save SIX MILES. The Glenwood Canyon route saved TWO HUNDRED MILES on the Denver-Las Vegas/Los Angeles drive. There's a fairly large difference there.

On that note, there's no river basin for your proposal to follow if you decided to "hook" I-72 further east after Price Canyon to cut extra mileage off. You'd be looking at unprecedented interstate construction. I-70 worked because it was able follow a relatively wide river basin across Colorado. That doesn't exist along any Price Canyon to I-70 scenario.

Revive 755:

--- Quote from: usends ---Insert Quote
I agree with corco: I-25 to I-80 is fairly direct, at least as far as travel within the Mountain West goes.  Plus, building an interstate-quality road through Price Canyon and Spanish Fork Canyon would be a remarkably expensive project.  See my webpage on the topic, and let me know your thoughts:
--- End quote ---

What's so difficult about Berthoud Pass on US 40?  I tried to look for information on that elsewhere on your site, but I got a "site is unsafe" warning from my security program, with a detailed report indicating the presence of a virus.

The problem is that even Berthoud Pass only saves 30 miles. There's just absolutely no way to justify new interstate construction through terrain that would be so remarkably expensive to build a freeway through just to save 30 miles, especially given that you're running at higher altitudes than I-80 AND I-70, through a notably avalanche prone location, which means it is even more likely to be closed than the other two roads.

Given the speed limit difference that would have to be in place (it's pretty much 75 MPH from the US-40 exit on I-80 all the way to the E-470 beltway on I-25 via I-80/I--25), and would likely NOT possibly be able to be 75 through the mountains (try 65 at the most- it gets down to 50 in parts of Glenwood Canyon), the time difference wouldn't even exist.

532 miles at an average speed of 71 MPH would take 7.5 hours, 500 miles at an average speed of 66 MPH would take 7.5 hours. You can easily average more than 71 MPH between Salt Lake and Denver via I-80, but I highly doubt you'd be able to average more than 66 MPH down the US-40 corridor.

I'm trying really hard to see it, but I can't see any situation arising where another east-west interstate from Denver to Salt Lake City makes any amount of sense.


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