Colorado National Forest Wilderness Act of 1983 - Designates the following lands in Colorado as components of the National Wilderness Preservation System: (1) the Service Creek Wilderness Area in the Routt National Forest; (2) the Buffalo Peaks Wilderness Area in the Pike and San Isabel National Forests; (3) the Cannibal Plateau Wilderness Area in the Uncompaghre National Forest; (4) lands in the Routt National Forest which shall be incorporated in the Mount Zirkel Wilderness Area; (5) the Fossil Ridge Wilderness Area in the Gunnison National Forest; (6) the Greenhorn Mountain Wilderness Area in the San Isabel National Forest; (7) lands in the Pike National Forest which shall be incorporated in the Lost Creek Wilderness Area; (8) lands in the Grand Mesa National Forest which shall be incorporated in the Raggeds Wilderness Area; (9) the Piedra Wilderness Area in the San Juan National Forest; (10) the St. Louis Peak Wilderness Area in the Arapahoe National Forest; (11) the Vasquez Peak Wilderness Area in the Arapahoe National Forest; (12) the Sangre de Cristo Wilderness Area in the San Isabel National Forest; (13) lands in the San Juan National Forest which shall be incorporated in the South San Juan Wilderness Area; (14) the Spanish Peaks Wilderness Area in the San Isabel National Forest; (15) lands in the White River National Forest which shall be incorporated in the Hunter-Fryingpan Wilderness Area; (16) lands in the San Juan National Forest which shall be incorporated in the Weminuche Wilderness Area; (17) the Wheeler Geologic Wilderness Area in the Rio Grande National Forest; and (18) lands in the Bureau of Land Management Gunnison Basin Resource Area which shall be incorporated in the Big Blue Wilderness Area.

Requires that the Williams Fork Further Planning Area in the Arapahoe National Forest be managed to maintain its present wilderness character.