Getting Oriented
The pass crosses Lake County (eastern) and Pitkin County (western) on the Continental Divide. Leadville on the eastern side is the highest incorporated city in the US at 10,152 feet. Basalt on the western side sits in the Roaring Fork Valley and serves as the gateway between Glenwood Springs and Aspen. The route is named for James J. Hagerman, the railroad builder who pushed the Colorado Midland over the divide in 1885 to reach the Aspen mining district.
Trail Overview
From the eastern access at Turquoise Lake near Leadville, the road climbs gently along the railroad bed for the first miles past the Hagerman Tunnel ruins — the original 1887 rail tunnel, now blocked but visible as a stone portal. The road continues climbing through aspen and lodgepole forest to the pass at 11,925 feet.
The western descent is the harder side: steep switchbacks drop quickly toward the Frying Pan River, with the Hell Gate section providing the route's most exposed cliff section. The road exits to the Frying Pan River Road near the Ruedi Reservoir.
Driving the pass takes 3 to 4 hours one-way. Most travelers run it as a one-way through-trip, often combining with Independence Pass (paved, just south) for an Aspen loop.
Points of Interest
- Hagerman Tunnel ruins. Stone portal of the original 1887 railroad tunnel.
- Pass summit. 11,925 feet on the Continental Divide.
- Hell Gate. The west-side switchback exposure.
- Ivanhoe Lake. A natural lake near the pass with primitive camping.
- Continental Divide views. Panoramic from the summit.
- Turquoise Lake. Reservoir near the eastern access with developed camping.
- Ruedi Reservoir. Western end with developed Forest Service camping.
- Aspen and Leadville mining history. Visible context throughout the route.
Where to Camp
Multiple Forest Service campgrounds along Turquoise Lake on the eastern access. Ruedi Reservoir on the western side has multiple developed sites. Dispersed camping is allowed throughout the surrounding national forest land with the standard 14-day stay limit.
Tips for a Safe and Enjoyable Trip
- Travel July through September. Snow blocks the route most of the year.
- The west side is the harder direction; first-timers may prefer west-to-east to encounter the Hell Gate section as a climb rather than a descent.
- Carry recovery gear and a full-size spare.
- Cell coverage is absent.
- Lightning hits the summit regularly. Plan to be off the high section by afternoon.
- Acclimate to altitude before driving.
- Stay on the road; the alpine tundra damages easily.
- Watch for cyclists. The pass is a destination for high-altitude road and gravel cycling.
- Yield to uphill traffic on the switchbacks.
- Contact the Pike-San Isabel National Forest at 719-486-0749 (Leadville Ranger District) for current conditions.
