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Maximum grades on Colorado mountain passes

This is the list, in descending elevation, of the steepest mountain passes of Colorado.

 Name Highway Elevation Maximum Grade
Mt.EvansSH 514,150’9%-15% 
IndependenceSH 82 12,095’6% 
Trail Ridge High Point U.S. 34 12,183’ 5.4% 
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% 
Milner U.S. 34 10,758’ 5.4% 
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. 249,507’5.8%
Rabbit EarsU.S. 409,426’ 6.8% N
La Veta/North La VetaU.S. 1609,413’6%
Trout Creek U.S. 24/2859,346’ 5.2%
Ute U.S. 249,165’5.6% E
PonchaU.S. 2859,010’ 3%
Dallas DivideSH 628,970’6.4% E; 5% W
Muddy U.S. 408,772’5.6%
McClureSH 1338,755’8%
DouglasSH 1398,268’7%
RatonI-257,834’6%
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