This highest of Rocky Mountain highs brings you to the rarefied world above timberline, a singular amalgam of hardy wildflowers, lichens and grasses, furry mammals like pikas and marmots, rock-jumping mountain goats, and alpine lakes. This is perhaps the best place in Colorado to catch a glimpse of the stately bighorn sheep. The weather is volatile - be prepared for wind, rain, lightning, snow, and hail any day of the year. The eastern portion of the byway travels from Echo Lake to Bergen Park via Clear Creek County Road 103 and Jefferson County Road 66. The route takes the visitor from open ponderosa and juniper hills and open meadows, up through deep spruce forests and into the magnificent splendor of the alpine environment.

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NOTE: Only the top portion from Echo Lake will be closed September 2024 through Memorial Day 2026 due to seasonal and construction closures. However, the remaining portion of Mount Blue Sky Scenic and Historic Byway that is typically open year-around from Idaho Springs, then over Mestaa'Ehehe Pass to Bergan Park (connects with Lariat Loop) will remain open.