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Maximum Grades on Colorado Mountain Passes

Listed in descending elevation.

Name

Highway

Elevation

Maximum Grade

Independence open seasonally

SH 82

12,095’

6%

Loveland

U.S. 6

11,992’

6%

Hoosier

SH 9

11,541’

8% N

Slumgullion

SH 149

11,361’

9.4% N; 7.9% S

Fremont

SH 91

11,318’

5.7%

Berthoud

U.S. 40

11,315’

6.1% N; 6% S

Monarch

U.S. 50

11,312’

6.4%

Eisenhower Tunnels Approaches

I-70

11,158’

6% W

Red Mountain

U.S. 550

11,018’

7%+

Molas

U.S. 550

10,910’

7% +

Spring Creek

SH 149

10,901’

7.5%

Wolf Creek

U.S. 160

10,850’

6.8%

Vail

I-70

10,666’

7%

Coal Bank

U.S. 550

10,640’

6.5%

Tennessee

U.S. 24

10,424’

6%

Cameron

SH 14

10,276’

3.8% E

La Manga

SH 17

10,230’

5.2%

Lizard Head

SH 145

10,222’

4.1%

North/North Cochetopa

SH 114

10,149’

6%

Cumbres

SH 17

10,022’

6.3%

Kenosha

U.S. 285

10,001’

5.3% E

Red Hill

U.S. 285

9,993’

6%

Cucharas

SH 12

9,941’

5.9% N; 5.4% S

Squaw

SH 103

9,807’

6%

Willow Creek

SH 125

9,621’

6.3%

Gore

SH 134

9,527’

6.3%

Wilkerson

U.S. 24

9,507’

5.8%

Rabbit Ears

U.S. 40

9,426’

6.8% N

La Veta/North La Veta

U.S. 160

9,413’

6%

Trout Creek

U.S. 24/285

9,346’

5.2%

Ute

U.S. 24

9,165’

5.6% E

Poncha

U.S. 285

9,010’

3%

Dallas Divide

SH 62

8,970’

6.4% E; 5% W

Muddy

U.S. 40

8,772’

5.6%

McClure

SH 133

8,755’

8%

Douglas

SH 139

8,268’

7%

Raton

I-25

7,834’

6%

SH 5 to Mt. Evans, which reaches an elevation of 14,150’, is not considered a mountain pass. Maximum is grade 9% to Summit Lake; 15% beyond Summit Lake. This is the highest paved road in North America and is open seasonally.

Milner Pass (10,758’) and Trail Ridge High Point (12,183’) are on U.S. 34 in Rocky Mt. National Park but are not maintained by CDOT. Maximum grade on both is 5.4%. Open seasonally.