U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Travel
 [Register]
Please register to participate in our discussions with 1.5 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
Jump to a detailed profile or search
site with Google Custom Search

Search Forums  (Advanced)
Business Search - 14 Million verified businesses
Search for:  near: 
 
 
Old 03-17-2010, 05:17 AM
 
Location: San Diego, California
2,496 posts, read 5,723,235 times
Reputation: 1816

Advertisements

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?
Quick reply to this message

 
Old 03-17-2010, 05:27 AM
 
Location: Cold Frozen North
1,926 posts, read 3,225,145 times
Reputation: 1206
I've seen 7%. It was somewhere on I-80 in Wyoming. I think it was between Cheyenne and Rawlins. I don't know if there is any interstate with a grade greater than 7% - at least I haven't seen it.
Quick reply to this message
 
Old 03-17-2010, 06:41 AM
 
Location: Hernando County, FL
8,489 posts, read 11,356,826 times
Reputation: 5397
Siskiyou Pass on I-5 in Oregon is supposed to be the steepest.

I-24 in Tennessee is not as steep but runs at a 4-6% grade for a long distance.
Quick reply to this message
 
Old 03-17-2010, 07:54 AM
 
Location: The land of Chicago
860 posts, read 1,192,864 times
Reputation: 1106
I think the Interstate standard is no higher than 7 or 8%
Quick reply to this message
 
Old 03-17-2010, 08:32 AM
 
Location: Atlanta, GA
238 posts, read 333,513 times
Reputation: 153
The one on I-24 in Tennessee use to be a 9% years ago, but due to some many accidents, they rearranged the highway around Monteagle in order to bring it down to a 6%. Going up is about three miles, and coming down is four. They added an extra mile coming down so that they could cut into the deadly grade.
Quick reply to this message
 
Old 03-17-2010, 09:44 AM
 
Location: Ventura County, Ca
130 posts, read 329,353 times
Reputation: 88
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.
Quick reply to this message
 
Old 03-17-2010, 10:34 AM
 
Location: 38 38' 45" N, -90 20' 08" W
7,646 posts, read 11,510,985 times
Reputation: 6185
I've driven on quite a few Interstate highways, and two come to mind: the section of I-70 near the Vail Pass in Colorado, and I-8 west of El Centro California.
Quick reply to this message
 
Old 03-17-2010, 11:30 AM
 
Location: Salem, OR
74 posts, read 175,926 times
Reputation: 38
Can't tell you the exact location, but passing through the mountains just north of Los Angeles heading north on I-5 had a very steep prolonged decline heading towards the central valley of CA. Steepest I think I can remember on an interstate anyway.
Quick reply to this message
 
Old 03-17-2010, 10:41 PM
 
Location: pine tree monotony
2,420 posts, read 4,132,033 times
Reputation: 1422
Quote:
Originally Posted by FloridaMD View Post
Can't tell you the exact location, but passing through the mountains just north of Los Angeles heading north on I-5 had a very steep prolonged decline heading towards the central valley of CA. Steepest I think I can remember on an interstate anyway.
The "grapevine" maybe?
Quick reply to this message
 
Old 03-17-2010, 11:18 PM
rah
 
Location: San Francisco
3,102 posts, read 5,233,422 times
Reputation: 2187
^yup that would be the grapevine, which according to wikipedia is a 7% grade. it has lanes for trucks to take the hill slowly so that they don't lose control, and it's lined with runaway truck ramps for those trucks that do lose control.
Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


 
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:
Over $84,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Travel

All times are GMT -6.

2005-2014, Advameg, Inc.

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 - Top