Mount Blue Sky Scenic Byway

The Mount Blue Sky Scenic Byway is a 49 mi National Forest Scenic Byway and Colorado Scenic and Historic Byway located in Clear Creek and Jefferson counties, Colorado, United States. The byway ascends to 14140 ft of elevation near the 14271 ft summit of Mount Blue Sky, making it the highest paved road in North America (beating the 14115 ft Pikes Peak Highway by only 25 ft.) The byway visits Echo Lake Park, the Mount Goliath Natural Area, the Dos Chappell Nature Center, and Summit Lake Park on its way to the summit. A fee is charged to travel State Highway 5 to the summit and vehicles over 30 ft long are not allowed, although they are allowed on State Highway 103 which reaches its highest elevation of 11020 ft at Juniper Pass.

The byway connects to the Lariat Loop Scenic and Historic Byway at Bergen Park.

Route
The byway begins at the Idaho Springs Visitor Center. Take Exit 241 off Interstate 70 for 1 mile. Stop at the Visitor Center for information, then continue on Miner Street to 13th Avenue which is State Highway 103 and continues on State Highway 5 through a corridor between the Mount Evans Wilderness where it ends near the summit of Mount Blue Sky. The byway is 28 mi in length and gains over 7000 ft of elevation. Achieving a final elevation of 14140 ft, this is the highest paved road in North America.

The road was originally planned by the Denver Mountain Parks system to link Summit Lake Park and Echo Lake Park to their lower altitude parks in the foothills. As originally planned, the road ran from Bergen Park near Evergreen to Echo Lake, and then to the summit, while the road from Echo Lake down into Chicago Creek Canyon was a secondary branch. From the start, the road was planned in terms of the scenic vistas along the way. The route was set by Frederick Law Olmsted Jr., and for a while, between 1915 and 1920, it was to be the primary access road for a proposed National Park comprising much of what is now the Mount Evans Wilderness Area.

There is a park fee charged if using parking lots and facilities along the upper portion of the byway. Prior to 2012, the Forest Service was charging anyone entering the highway at the entrance to Highway 5. This portion of the byway is often narrow, with sudden dropoffs that have no guardrails. It is typically accessible from Memorial Day weekend through Labor Day, although the amount of access and specific dates vary depending on the weather and road conditions. Planned improvements to Highway 5 will cause lane closures near Summit Lake starting in late July or early August 2024, and the highway will be closed for all of 2025.

This route was designated a National Forest Scenic Byway on July 1, 1993 by the US Forest Service and has also been designated a Colorado Scenic Byway by the Colorado Department of Transportation.