Eastern Mojave Vegetation U. S. Interstate 84  

Tom Schweich  

Home Page  US Interstate 84 has a western segment and an eastern segment.

Interstate 84 (I-84) is an Interstate Highway in the Western United States that runs from Portland, Oregon, to a junction with Interstate 80 near Echo, Utah. The highway originally served as a fork of I-80 to serve the Pacific Northwest, and was originally numbered Interstate 80N.

Other articles:
• U. S. Interstate 5:   at US I-84;  

Exit 1: US Interstate 5


Other articles:
• Field Notes:   20 Oct 2017;

Locations: Rooster Rock (historical).
Full Size ImageInterpretive panel at Rooster Rock State Park  

Rooster Rock State Park

Full Size Image
Rooster Rock
Exit 25: Rooster Rock State Park

Lewis and Clark Expedition

Rooster Rock

Meriwether Lewis and William Clark, the two great American explorers who made secure the claim of the United States for the Oregon country, passed along this stretch of the Columbia River with their Corps of Discovery on their way to the Pacific Ocean on October 31 -- November 2, 1805. They brought their boats through the “Great Shute” (now covered by the waters of Bonneville Dam) and recorded “a remarkable high detached rock stands in a bottom on the stard side ... [it is] 800 feet high and 400 paces around, we call [it] the beaten rock.” A later journal entry called it Beacon Rock.

The captains described “great numbers of sea otters” and “a high clift of black rocks” (Cape Horn) on the north shore. Clark wrote “here the river widens to near a mile, and the bottoms are more extensive and thickly timbered, as also the high mountains on each side ... passed a rock near the middle of the river, about 100 feet high and 80 feet diameter [Phoca Rock] ... we encamped under a high projecting rock on the lard [Rooster Rock].”

The expedition camped in this area April 6-9, 1806, on their return journey. They noted that Beacon Rock “may be esteemed the head of tidewater.”


Hood River

Exit 63: 2nd Street, exit for downtown Hood River.

Other articles:
• U. S. Highway 395:   at I-84W;  

Exit 188: US Highway 395, Umatilla-Stanfield Highway, Thielsen Road



Locations: Pendleton.  



Other articles:
• U. S. Highway 395:   at US I-84 East;  

Junction: US Highway 395, south.

Other articles:
• How did rubber rabbitbrush get that long scientific name?:   Ericameria in Nuttall 1840;

Locations: Bliue Mountains.  

Exit 243: Summit Road, NF-301

The highway crosses a low pass through the Blue Mountains

Other articles:
• Field Notes:  3 Oct 2022;
Full Size ImageWelcome to Idaho.  

Oregon above

Idaho below

  Exit 3: US Highway 95, north to Weiser, or south to Parma. Also nearby access to US Highway 30.

Other articles:
• U. S. Highway 20:   at I-84 Exit 26;
• US Hwy 26:   at I-84 Exit 26;  

Exit 26: US Highway 20, US Highway 26, exit here and go northwest through Nyssa, then turn west into Oregon.
  Exit 27: Centennial Way
  Exit 28: N. 10th Avenue

Other articles:
• US Hwy 26:   at I-84 Exit 29;  

Exit 29: Franklin Road. US Highways 20 and 26 East exit here to Boise.



Other articles:
• Field Notes:   26 Sep 2022;

Locations: Boise.  


  Exit 53: Vista Avenue, for the airport.

Other articles:
• U. S. Highway 20:   at I-84 Exit 54;
• US Hwy 26:   at I-84 Exit 54;  

Exit 54: US Highway 20, US Highway 26, Broadway Ave.

Other articles:
• Idaho Hwy 21:   at US I-84;  

Idaho Highway 21, E. Gowen Rd.

Other articles:
• US I-84:   at Exit 90;  

Exit 90: Old US Hwy 30, Bus I-84, into Mountain Home.



Mountain Home


Other articles:
• U. S. Highway 20:   at Mtn Home;
• US I-84:   at Exit 95;  

US Highway 20 is concurrent with I-84 west to Caldwell where, with US Hwy 26, it diverges through Oregon.

Exit 95: US Highway 20 north than east across Camas Prairie.

Other articles:
• US Hwy 26:   near Bliss;
• US Hwy 30:   at I84 E141;  

Exit 141:
  • US Highway 26, northeast and southeast to join I-15 at Blackfoot.
  • US Highway 30, south turning east to rejoin I-84 near Burley.

Other articles:
• Hagerman Highway:   at I 84;  


  • East 2950 South “Hagerman Highway”, west to US Highway 30.
  • East 2950 South, Idaho 46 Spur, West Main Street, east to Wendell.





  • Idaho Highway 46, South Idaho Street, into Wendell.

Other articles:
• U. S. Highway 93:   at US I-84;  

Exit 173: US Highway 93, south to Twin Falls, or north to Shoshone.

Other articles:
• US Hwy 30:   at I84 E211;  

Junction: US Highway 30, following a route closer to the Snake River.

Other articles:
• Interstate 86:   at Exit 1;  

Junction: US Interstate 86, east to US I-15 at Pocatello, Idaho.

Other articles:
• Interstate 86:   at Exit 1;  

Junction: US Interstate 86, east to US I-15 at Pocatello, Idaho.


Sweetzer Summit

Elevation: 5525 feet.

Snake River drainage above. Great Salt Lake Drainage below.


Exit 263: 38000W, Juniper Road


Juniper Rest Area


Idaho above

Utah below

Other articles:
• Interstate 15:   at Exit 379;  

Junction: US Interstate 15

Locations: Morgan Valley.
Full Size ImageMountains ahead on US I-84.  

Morgan Valley


Other articles:
• Interstate 80:   at I-84;  

Junction: US Interstate 80

End of western segment.

  US Interstate 84 West above

US Interstate 84 East below
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.  

[Home Page] [Site Map]

Date and time this article was prepared: 6/6/2024 11:48:20 AM