The pass is traversed by State Route 36 and has virtually the same elevation as Morgan Summit to the west (sources vary).

[6] [7][8] In 1880, Dr. Fredonyer died in San Francisco after colon surgery to remove a 16-ounce bottle that he had inadvertently lost inside his rectum after an attempt to alleviate a severe case of diarrhea.

[1][9][10] In 1995, there was an unsuccessful move to rename Fredonyer Pass to honor of Deputy Sheriff Larry David Griffith, who was slain in the line of duty.

This irregular boundary is sometimes defined as the southern extent of Cenozoic igneous surface rock from the Cascade Range.

Note that there are other Cenozoic igneous rocks in the Sierra (e.g., near Lake Tahoe), but there is a clear geological division near Fredonyer Pass, and points westward as far as the Sacramento Valley.