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Old 03-17-2010, 10:50 PM
 
Location: Katy-zuela
4,852 posts, read 8,989,338 times
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Quote:
Originally Posted by westcoastvp View Post
It's not an interstate, but US 101 freeway in Ventura County, Ca is a 7% grade and I read somewhere that it's the steepest in California.
The Conejo Grade? I remember going uphill on that thing is a struggle compared to going downhill.

Quote:
Originally Posted by hdwell View Post
The "grapevine" maybe?
Actually the Tejon Pass. Technically the 5 freeway is in the Tejon Pass.
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Old 03-18-2010, 04:48 AM
 
Location: The canyon (with my pistols and knife)
13,217 posts, read 17,948,587 times
Reputation: 14655
I-470 in Ohio and West Virginia (the Wheeling Bypass) has three steep grades. If you drive it eastbound, you have a moderate descent for about six miles, and then you cross the Ohio River into West Virginia and have a steep, curvy ascent for two miles, followed by a steep, straight descent for two miles before merging back onto I-70 east of Wheeling.
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Old 03-18-2010, 04:30 PM
 
Location: Seattle & Bellevue
253 posts, read 850,366 times
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The Siskiyou Pass in Oregon going south on I-5 to California is the steepest. Put the car in neutral and fly down to Redding at 100 MPH - just watch out for OHP/CHP.
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Old 03-22-2010, 04:07 AM
 
Location: Southwest Washington
2,317 posts, read 6,884,577 times
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Quote:
Originally Posted by BB_206 View Post
The Siskiyou Pass in Oregon going south on I-5 to California is the steepest. Put the car in neutral and fly down to Redding at 100 MPH - just watch out for OHP/CHP.
OSP you mean? There is no OHP...

But yep. Siskiyou Pass is easy peasy. I mean... It is the steepest, but it's not that bad. It's a freeway, after all.
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Old 03-22-2010, 08:10 AM
Status: "could've~would've~should've used 'have', not 'of'" (set 15 days ago)
 
Location: A Yankee in northeast TN
10,452 posts, read 14,303,163 times
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Mountain Grade Info
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Old 03-22-2010, 09:03 AM
 
625 posts, read 1,561,619 times
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I80 going into SLC seems long and steep.
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Old 03-22-2010, 01:40 PM
 
Location: Cleveland, Ohio
1,372 posts, read 2,792,589 times
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Highway 101 in Ventura county in California has a dangerously steep grade. While traveling the P.C.H. in 2007, I happened upon this incredibly steep decline ... I thought I was going to pass out!
It's a total "nosebleed" hill ... anybody with "vertigo" had best avoid this particular stretch of highway.
I rode my brakes the entire way down this grade.
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Old 03-22-2010, 03:46 PM
 
Location: Wherever I want to be... ;)
2,539 posts, read 8,831,010 times
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You guys are awesome! Thanks for the answers!
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Old 03-22-2010, 08:40 PM
 
Location: Seattle & Bellevue
253 posts, read 850,366 times
Reputation: 111
My bad, thanks.

Quote:
Originally Posted by backdrifter View Post
OSP you mean? There is no OHP...

But yep. Siskiyou Pass is easy peasy. I mean... It is the steepest, but it's not that bad. It's a freeway, after all.
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Old 03-22-2010, 08:45 PM
 
3,970 posts, read 11,825,661 times
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Quote:
Originally Posted by thepinksquid View Post
Does anyone happen to know? I've been searching online to try to find out but I've yet to come up with a conclusive answer.

I'm guessing I-84 in Oregon coming down/up Emigrant Hill...but I'm not sure. I think that one is at around 7% or so...which seems lower than what I'd assume the maximum would be, but IDK.

Anyone know the answer?
Technically there may be steeper Interstates, but your original guess is a good one. I-84 in Northeast Oregon (Emigrant Hill, just east of Pendleton) is one of the most magnificent stretches of 6% grade in the US. Multiple lane, multiple emergency truck escapes (westbound), is a great example of steep freeway construction in the U.S. Totally rebuilt in the 90's, this is Interstate freeway at its best. If you have a pulse, this drive will raise it, especially westbound coming down the hill.
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