Parent Lineage
Willoughby Mountain: 13,144' CO 440' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | Buckskin Benchmark | 13,381' | 12,465' | 916' | CO |
| 2 | Sleeping Sexton | 13,457' | 13,037' | 420' | CO |
| 3 | Maroon Peak | 14,163' | 11,835' | 2,328' | CO |
| 4 | Castle Peak | 14,274' | 11,916' | 2,358' | CO |
| 5 | La Plata Peak | 14,344' | 12,498' | 1,846' | CO |
| 6 | Harvard, Mount | 14,424' | 12,074' | 2,350' | CO |
| 7 | Massive, Mount | 14,427' | 12,444' | 1,983' | CO |
| 8 | Elbert, Mount | 14,438' | 5,346' | 9,092' | CO |
| 9 | Whitney, Mount | 14,494' | 4,415' | 10,079' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | 13015 | 13,015' | 292' | CO |
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