At 10,622 feet elevation, Vail Pass is well known to Colorado drivers and visitors as an amazingly scenic route skirting the southern Gore Range. Construction of this iconic transportation corridor in the late 1970s was a remarkable achievement and marked a turning point in the interstate’s construction from Denver to Utah. Amid growing environmentalism across the nation, the interstate’s design over Vail Pass incorporated environmental and aesthetic considerations for the first time. This shift in mindset resulted in the construction of naturalized and landscaped retaining walls, erosion control measures to protect streams, colors that blended into the landscape, and sculpted bridges to span natural drainages in the interstate’s path.