Eastern Mojave Vegetation U. S. Highway 91  
 

Tom Schweich  

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Literature Cited 		  For the most part US Highway 91 has been replaced by US Interstate 15. There are two segments of US Highway remaining. A northern segment follows a route abandoned by I-15 from just south of Pocatello, Idaho, through Logan, Utah, and then into the Great Salt Lake basin, where I-15 is rejoined. The southern segment of US Highway 91 heads west from Saint George, Utah then turns south to Littlefield, Arizona, bypassing the route that I-15 now takes through the Virgin River Canyon.
     
Northern segment of US Highway 91 is below.
 

Other Articles: Interstate 15: Idaho Exit 36  

 Junction: US Interstate 15, north to Pocatello, Idaho, or south to Salt Lake City, Utah.

The reason to take US Hwy 91 south rather than I-15 would be to view the spillway of Pleistocene Lake Bonneville into the Snake River drainage at Zenda and Red Rock Pass.

Literature Cited:
- Hart, William S., Jay Quade, David B. Madsen, Darrell S. Kaufman, and Charles G. Oviatt., 2004.  

Locations: Zenda.  

Zenda

Location in southern Idaho, off US Highway 91.

Zenda is given as the location of an alluvial dam that held the highest stand of Pleistocene Lake Bonneville for 500 to 1000 years before it eroded, creating the Bonneville Flood.

Literature Cited:
- Hart, William S., Jay Quade, David B. Madsen, Darrell S. Kaufman, and Charles G. Oviatt., 2004.  

Locations: Red Rock Pass.  

Red Rock Pass

Bedrock threshold for the Provo shoreline of Pleistocene Lake Bonneville.
      Idaho Above.
Utah below.
 

Locations: Logan.  

Logan

 
 

Other Articles: Interstate 15: Utah Exit 364  

Brigham City

Junction: US Interstate 15, south to Salt Lake City, Utah, or north to Pocatello, Idaho.
      Northern segment of US Hwy 91 above
Southern segment of US Highway 91 below.

Other Articles: Interstate 15: Saint George

Locations: Saint George.  

St. George


Junction:
  • US Interstate 15, North to Salt Lake City, South to Las Vegas.
     

Santa Clara

 
     

Shivwits

 

Other Articles: Mojave Desert Joshua Tree Road: at US Hwy 91  

Junction:

Junction: Mojave Desert Joshua Tree Road to area where Swertia albomarginata was found.
     

Utah Hill Summit

 
     

CastleCliff

 

Other Articles: Mojave Desert Joshua Tree Road: at US Hwy 91  

Junction:

Junction: Mojave Desert Joshua Tree Road
      Utah above …
Arizona below …
 

Other Articles: Interstate 15: Littlefield  

Littlefield

Junction:
  • US Interstate 15, north to St. George; south to Las Vegas.
     

Literature Cited

  A list of all literature cited by this web site can be found in the Bibliography.
 
Hart, William S., Jay Quade, David B. Madsen, Darrell S. Kaufman, and Charles G. Oviatt. 2004. The 87Sr/86Sr ratios of lacustrine carbonates and lake-level history of the Bonneville paleolake system. GSA Bulletin. 116(9/10):1107-1119.

Location records referred to by this literature:

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: 5/8/2008 9:43:19 AM