Eastern Mojave Vegetation Sonora Pass, Mono County, California.

Query: G.N.I.S.

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Pass through the Sierra Nevada between Yosemite and Lake Tahoe, 9643 feet.
Sonora Mono Toll Road

Oldest of the trans-Sierra emigrant trails to California is spectacular Sonora Pass cross by Highway 108, second highest (9,626 feet) of all highway crossings of the range. The Bartleson-Bidwell party, with mules, horses and oxen made the first crossing on October 18, 1841. This route was not attempted by wagons until 1852. "Grizzly" Adams took the trail over Sonora Pass in April, 1854, and reported "on all sides lay old axle trees and wheels ... melancholy evidence of the last season's disasters." The present route first projected in 1862 was finally completed as a toll road, due to the extreme cost, by Mono, Tuolumne and Stanislaus counties in 1865. It was said to take three weeks for a six-horse team to make the round trip between Sonora and Bridgeport.

Plaque dedicated September 10, 1983
Bodie Chapter No. 64
Matuca Chapter No. 1849
E Clampus Vitus

Elevation: 9609ft, 2929m.

Articles that refer to this location:


Literature Referring To This Location:

Species collected at or near this location.

This list summarizes plants collected or observed at this specific, named location. It does not include plants collected or observed at nearby named or unnamed locations. It may be more instructive to use the Area Lists that contain this location.

  • TAS – The plant was collected by Tom Schweich.
  • Oth – The plant was collected by someone, but not Tom.
  • Obs – The plant was observed, but not collected.


Frasera speciosa Griseb. Elkweed (Oth)

Total number of taxa: 1
Native Taxa:
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Exotic Taxa:
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Nativity Undetermined:
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Listed Weeds:
Identified as Weed
If you have a question or a comment you may write to me at: tas4@schweich.com I sometimes post interesting questions in my FAQ, but I never disclose your full name or address.  

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Date and time this article was prepared:5:22:05 PM, 9/18/2023.