US 491
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US 491 at US Ends.com

Photo: US 491 north of Shiprock NM (FWHA) 		US 491
From: Gallup, NM
To:  Monticello, UT
Total Length:  194.1 miles    
ROUTE LOG
I-40 (Exit 20): 0 - 0
US 64 WB: 91.3 - 91.3
US 64 EB: 0.9 - 92.2
CO STATE LINE: 15.3 - 107.5
US 160 WB: 6.6 - 114.1
US 160 EB: 19.6 - 133.7
UT STATE LINE: 43.4 - 177.1
US 191: 17.0 - 194.1
 Creation: Appeared in May 2003 (AASHTO) as a renumbering of US 666 from Gallup NM to Monticello UT. The states involved had actually requested US 393.

1927 RMcN
US 666 out of Gallup
1927 RMcN
2003 NM application to AASHTO
US 393 set to replace US 666
2003 NM application to AASHTO
2022 Official
US 491 replaces US 666 instead
2022 Official

1971 Official
US 666 to Monticello UT
1971 Official
2004 Official
US 491 replaces US 666
2004 Official

Adjustments: None
Comments: It took Colorado over 10 years to reflect US 491 on their maps.
There are US 491 postings south of I-40 to where I-40 Business runs. However, New Mexico DOT maps/data show the road below I-40 as NM 602.
It is a head scratcher why this wasn't numbered US 291...

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Page last modified 25 February 2026