The San Juan Skyway Scenic and Historic Byway is a All-American Road, National Forest Scenic Byway, and Colorado Scenic and Historic Byway located in Dolores, La Plata, Montezuma, San Juan, and San Miguel counties, Colorado, USA. The byway forms a loop in southwestern Colorado traversing the heart of the San Juan Mountains. The San Juan Skyway reaches its zenith at Red Mountain Pass at elevation . Mesa Verde National Park was one of the original UNESCO World Heritage Sites. The Silverton Historic District and the Telluride Historic District are National Historic Landmarks. It roughly parallels the routes of the narrow gauge railways: Rio Grande Southern (US 160, SH 145 and SH 62); and the unconnected Ouray and Silverton Branches of the Denver & Rio Grande along US 550 with the Silverton Railroad bridging a part of the gap. Its origin can be traced to the Around the Circle Route promoted by the D&RG. The San Juan Skyway overlaps with the Trail of the Ancients Scenic and Historic Byway on Colorado State Highway 145 between U.S. Highway 160 and Colorado State Highway 184. The San Juan Skyway connects with the Tracks Across Borders Scenic and Historic Byway at Durango, the Alpine Loop Back Country Byway at Silverton and Ouray, and the Unaweep Tabeguache Scenic Byway at Placerville. Route description U.S. Highway 160 Starting in Durango, Colorado, the largest city on San Juan Skyway, the byway follows U.S. Highway 160 (US 160) west through the town of Mancos to Cortez passing the entrance to Mesa Verde National Park. State Highway 145 The byway turns north at Cortez, following State Highway 145 (SH 145) through the town of Dolores and the Dolores River into the San Juan National Forest. The byway passes through Rico, county seat of Dolores County prior to 1941. The old Courthouse still remains. From Rico the byway crosses 10,222 ft (3116 m) Lizard Head Pass and enters the Uncompahgre National Forest. Lizard Head Pass provides views of the El Diente Peak, the Mount Wilson, the Wilson Peak and the pass's namesake, the Lizard Head Peak. The byway descends near the town of Ophir past the location of the Ophir Loop of the Rio Grande Southern Railroad. A spur road heads off to the mining town turned ski resort of Telluride. The byway follows the San Miguel River to the town of Placerville. State Highway 62 The byway turns east