Eagle River (Colorado) in the context of Colorado River (U.S.)

The Sawatch Range /səˈwɑːtʃ/ or Saguache Range is a high and extensive mountain range in central Colorado which includes eight of the twenty highest peaks in the Rocky Mountains, including Mount Elbert, at 14,440 feet (4,401 m) elevation, the highest peak in the Rockies.

The range is oriented along a northwest–southeast axis, extending roughly 80 miles (130 km) from 39°37′36″N 106°32′13″W / 39.62667°N 106.53694°W / 39.62667; -106.53694 in the north to 38°5′51″N 106°3′48″W / 38.09750°N 106.06333°W / 38.09750; -106.06333 in the south. The range contains fifteen peaks in excess of 14,000 feet (4,267 m), also known as fourteeners. The range forms a part of the Continental Divide, and its eastern side drains into the headwaters of the Arkansas River. The western side of the range feeds the headwaters of the Roaring Fork River, the Eagle River, and the Gunnison River, tributaries of the Colorado River.

Vail Pass is a 10,662-foot-high (3,250 m) mountain pass in the western United States, located in the Rocky Mountains of central Colorado. The pass was named for Charles Vail, a highway engineer and director of the state highway department from 1930 to 1945.

Vail Pass lies on the boundary between Eagle and Summit counties, between Vail on the west and Copper Mountain on the east. It provides the route of Interstate 70 (and earlier U.S. Highway 6) between the upper basins of the Eagle River and the Blue River, both tributaries of the Colorado River. Black Gore Creek, a tributary of Gore Creek, in the watershed of the Eagle, descends from the north side of the pass towards the town of Vail. West Tenmile Creek, in the watershed of the Blue, descends from the south side. The pass is significantly steep on either side (7% max.), and two runaway truck ramps are available on the west bound side for trucks.