8% grade

I seen an 11℅ grade but never drove on it. It's usually 5-7% out there. There's a 9% somewhere in Oregon and it's a few miles long.

 

Steepest?

Erm, there is a couple 24-26%'s There is a 21% with my name on it in Vermont near the Canadian Border via Ethan Allen Furnature factory right at the border. To reach it you have to descend a 3 mile 21% straight down, to get out of it you have to climb it loaded to the max, the 350 cat in low gear will give you less than walking speed all the way to the top that takes about a hour and 10 minutes. And three to cool off.

8% is steep, enough to get your attention.

I also own a Tahoe and would not take her onto steep hills (In the Ozarks we have a few that are REALLY crooked and steep as in signed 5 mph curves that face open sky...)

You will have a lot of brake work to do in the future with that Tahoe. If you are in 4 wheel drive be very mindful that rear axle may snap if you put too much against it. It's a nice truck, but they don't make em like that anymore.

There are grades in plenty out there around the USA, probably close to 1000 interstate grades, and maybe tens of thousands more unmarked. One in particular not far from where I am is a near vertical wall of shale rock that slips. You aim the cement mixer at it in a speed designed to momentum climb that one and plop it after catching some air at the top onto the common road there. Getting down it means setting all your brakes and allowing it to literally slide down with locked wheels loaded and allowing it to roll a little bit on the run out once you reached something flat enough to make the stop prior to the designated pour area.

That was my steepest ever. And that mack did well. You have to have a little crazy to do it like that.

 

San Francisco, 31.5% - don't put your truck on it, you'll get hung up at the joint.

8%, 1/4 mile..... Lol. Funny guy.

 

Sad part would be if that guy was routed that way by the company lmao

 

And that is a short truck!

 

Whitebird summit going south out of Lewiston Idaho Hwy 95 is 7% - 8% grade seven miles long.

 

Wolf Creek Pass.
Everything else is just a road.

 

Oddly enough, I ran across a 17% grade on OH 303 just outside Richfield. That one was a pretty good climb even empty.