Parent Lineage
Williamson Mountain: 6,304' OR 1,044' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | Koosah Mountain | 6,520' | 6,020' | 500' | OR |
| 2 | Wife, The | 7,054' | 6,220' | 834' | OR |
| 3 | South Sister | 10,362' | 4,768' | 5,594' | OR |
| 4 | Lassen Peak | 10,464' | 5,215' | 5,249' | CA |
| 5 | Highland Peak | 10,939' | 8,400' | 2,539' | CA |
| 6 | Stanislaus Peak | 11,233' | 10,440' | 793' | CA |
| 7 | Sonora Peak | 11,463' | 9,620' | 1,843' | CA |
| 8 | Leavitt Peak | 11,572' | 9,527' | 2,045' | CA |
| 9 | Tower Peak | 11,754' | 9,579' | 2,175' | CA |
| 10 | Eagle Peak | 11,851' | 9,504' | 2,347' | CA |
| 11 | Matterhorn Peak | 12,301' | 10,668' | 1,633' | CA |
| 12 | Twin Peaks | 12,325' | 10,183' | 2,142' | CA |
| 13 | Excelsior Mountain | 12,445' | 11,200' | 1,245' | CA |
| 14 | Conness, Mount | 12,594' | 9,940' | 2,654' | CA |
| 15 | Dana, Mount | 13,060' | 10,603' | 2,457' | CA |
| 16 | Lyell, Mount | 13,118' | 11,187' | 1,931' | CA |
| 17 | Ritter, Mount | 13,143' | 9,174' | 3,969' | CA |
| 18 | Red Slate Mountain | 13,163' | 11,420' | 1,743' | CA |
| 19 | "Ruby Peak" | 13,188' | 12,700' | 488' | CA |
| 20 | Mills, Mount | 13,460' | 12,980' | 480' | CA |
| 21 | Abbot, Mount | 13,704' | 12,860' | 844' | CA |
| 22 | Bear Creek Spire | 13,740' | 11,140' | 2,600' | CA |
| 23 | Humphreys, Mount | 13,986' | 11,423' | 2,563' | CA |
| 24 | North Palisade | 14,242' | 11,347' | 2,895' | CA |
| 25 | Williamson, Mount | 14,375' | 12,696' | 1,679' | CA |
| 26 | Whitney, Mount | 14,494' | 4,415' | 10,079' | CA |
Green = More Prominent Parent
Immediate Children:
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