Access to Historic Route 66 along I-40 at Exit 121 will close Monday for a $4.3 million bridge project. ADOT will replace decks on three bridges between I-40 exit 121 and the west side of Seligman. Officials say these bridges are between 40 and 50 years old, and the current decks need heavy maintenance. The second I-40 exit, Exit 123 about 60 miles west of Flagstaff, and route to Seligman’s east side will remain open. The project is scheduled to be completed in May 2019.