Steep Grades - CO
Hwy 160 in Colorado - Steep grades from South Fork, CO to Bayfield, CO
Thanks to Tommy Deese for submitting this route
Route 550 in Colorado - from Ridgeway, CO to Durango, CO - steep grades both ways
Hwy 149, Colorado between Lake City, CO and Creede, CO - steep grades
I-70 in Colorado between Denver and Downieville, CO - 6 miles of 5 to 7 % grades
Submitted by: Roger Gallagher
Windy and steep hills on the U.S. 40 in Colorado west of Denver
Absolutely no vehicles over 35 feet in length
(this includes a vehicle and trailer that, together, exceed 35 feet)
may use the Pass at any time.
The Trail Ridge Road is the highest paved through road
in Colorado and it is also the highest paved road in
Colorado that crosses the continental divide
Cottonwood Pass - The road is fully paved on both sides
It is also the highest pass with an improved road in the state
The twisty road is considered to be especially
treacherous during the winter months. A steep,
steady 6.7% grade, along with numerous hairpin turns
on either side, make it difficult to snowplow the road regularly
Hoosier Pass - The road over the pass has a smooth approach
on the south side but has several switchbacks on the north side
with a grade of 8%.
Fremont Pass - Despite being one of the highest mountain
passes in the state, the only steep part is the switchback
on the final ascent toward the Climax mine
on the south side. The rest of the pass is gentle.
This stretch through the gorge is challenging
and potentially hazardous to drive; it is characterized
by steep cliffs, narrow lanes, and a lack of guardrails
Grand Mesa - On the north side, the road climbs
the steep terrain near the Powderhorn Resort ski area.
La Manga Pass
McClure Pass - A scenic drive indeed, the road travels
right next to the famed Crystal River, known for thrilling
whitewater river running.