Oso Tunnel | Oso Tunnel | Archuleta | 8268 | Chromo |
Twin Lakes Reservoir Tunnel Number 2 | Twin Lakes Reservoir Tunnel Number 2 | Pitkin | 12168 | New York Peak |
Aurora Rampart Tunnel Number 1 | Aurora Rampart Tunnel Number 1 | Douglas | 6079 | Platte Canyon |
Duffy Tunnel | Duffy Tunnel | Moffat | 6256 | Horse Gulch |
Beavertail Mountain Tunnel | Beavertail Mountain Tunnel | Mesa | 5075 | Cameo |
Leon Tunnel | Leon Tunnel | Mesa | 10502 | Leon Peak |
Harold D Roberts Tunnel | Harold D Roberts Tunnel | Summit | 12346 | Montezuma |
Laramie Poudre Tunnel | Laramie Poudre Tunnel | Larimer | 9449 | Boston Peak |
Dille Tunnel | Dille Tunnel | Larimer | 6066 | Masonville |
Rams Horn Tunnel | Rams Horn Tunnel | Larimer | 9157 | Longs Peak |
Prospect Mountain Tunnel | Prospect Mountain Tunnel | Larimer | 8842 | Longs Peak |
Bald Mountain Tunnel | Bald Mountain Tunnel | Larimer | 6726 | Pinewood Lake |
Rattlesnake Tunnel | Rattlesnake Tunnel | Larimer | 6952 | Pinewood Lake |
McCullough Tunnel | McCullough Tunnel | Summit | 11922 | Breckenridge |
Quandary Tunnel | Quandary Tunnel | Summit | 11726 | Breckenridge |
Hunter Tunnel | Hunter Tunnel | Pitkin | 11096 | Meredith |
Nast Tunnel | Nast Tunnel | Pitkin | 10407 | Nast |
Granite Adit | Granite Adit | Pitkin | 10154 | Nast |
Hagerman Tunnel | Hagerman Tunnel | Pitkin | 11932 | Homestake Reservoir |
Homestake Tunnel | Homestake Tunnel | Pitkin | 11591 | Homestake Reservoir |
Phillipson Portal | Phillipson Portal | Lake | 11460 | Climax |
Ceresco Ridge Portal | Ceresco Ridge Portal | Lake | 11519 | Climax |
Storke Portal | Storke Portal | Lake | 11197 | Climax |
Twin Lakes Reservoir and Canal Company Tunnel Number 1 | Twin Lakes Reservoir and Canal Company Tunnel Number 1 | Lake | 13133 | Independence Pass |
Arrow Tunnel | Arrow Tunnel | Grand | 9728 | Fraser |
Needle Eye Tunnel | Needle Eye Tunnel | Boulder | 11371 | East Portal |
Vasquez Tunnel | Vasquez Tunnel | Clear Creek | 11985 | Berthoud Pass |
Eisenhower Memorial Tunnel | Eisenhower Memorial Tunnel | Summit | 12231 | Loveland Pass |
Golden Belt Tunnel | Golden Belt Tunnel | Clear Creek | 9724 | Grays Peak |
Aurora Rampart Tunnel Number 2 | Aurora Rampart Tunnel Number 2 | Douglas | 6585 | Kassler |
Denver Tunnel | Denver Tunnel | Mineral | 10623 | Spar City |
Saint John Tunnel | Saint John Tunnel | Teller | 11355 | Pikes Peak |
Strickler Tunnel | Strickler Tunnel | El Paso | 11837 | Pikes Peak |
Carlton Tunnel | Carlton Tunnel | Teller | 9157 | Cripple Creek South |
Roosevelt Tunnel | Roosevelt Tunnel | Teller | 9367 | Cripple Creek South |
Apishapa Arch | Apishapa Arch | Las Animas | 10151 | Herlick Canyon |
South Fork Tunnel | South Fork Tunnel | Pitkin | 11519 | Mount Champion |
Bagley Tunnel | Bagley Tunnel | San Juan | 11427 | Handies Peak |
Henderson Tunnel | Henderson Tunnel | Grand | 10065 | Ute Peak |
Pole Hill Tunnel | Pole Hill Tunnel | Larimer | 8717 | Panorama Peak |
Olympus Tunnel | Olympus Tunnel | Larimer | 8504 | Glen Haven |
Alva B Adams Tunnel | Alva B Adams Tunnel | Grand | 11447 | McHenrys Peak |
Saint Vrain Supply Tunnel | Saint Vrain Supply Tunnel | Boulder | 5571 | Lyons |
Missouri Tunnel | Missouri Tunnel | Eagle | 11276 | Mount of the Holy Cross |
Hoosier Pass Tunnel | Hoosier Pass Tunnel | Summit | 11653 | Alma |
Chapman Tunnel | Chapman Tunnel | Pitkin | 11683 | Nast |
Charles H Boustead Tunnel | Charles H Boustead Tunnel | Pitkin | 11821 | Homestake Reservoir |
Ivanhoe Tunnel | Ivanhoe Tunnel | Pitkin | 12073 | Homestake Reservoir |
Moffat Tunnel | Moffat Tunnel | Grand | 11270 | East Portal |
August P Gumlick Tunnel | August P Gumlick Tunnel | Clear Creek | 11827 | Byers Peak |
Gunnison Tunnel | Gunnison Tunnel | Montrose | 7047 | Cerro Summit |
Old Alpine Tunnel (historical) | Old Alpine Tunnel (historical) | Chaffee | 11939 | Cumberland Pass |
Blanco Tunnel | Blanco Tunnel | Archuleta | 9655 | Harris Lake |
Tunnel Number 1 | Tunnel Number 1 | Jefferson | 6148 | Evergreen |
Tunnel Number 2 | Tunnel Number 2 | Jefferson | 6834 | Evergreen |
Tunnel Number 3 | Tunnel Number 3 | Jefferson | 6722 | Evergreen |