The first three sections of I-69 were originally scheduled to open at some time during 2015 or 2016.
Around 300 acres of forests and wetlands were destroyed during I-69 construction but INDOT says it will replenish land on a 3:1 ratio.
The grand opening celebrations along the route are closed to the public.
The Washington City Council voted in favor of annexing 1,200 acres into the city.
The Indiana Department of Transportation plans to open the first three sections of Interstate 69 on Nov. 19, as long as construction remains on schedule.
The trumpet will allow traffic to move through the interchange at a higher speed than some of the other designs that were previously on the table.
INDOT says the Draft Environmental Impact Statement looks at potential impacts the road will have on the natural environment.
Indiana residents gathered Saturday on I-69 to celebrate the opening of the road with special events such as antique car shows and face painting booths.
The portion of I-69 from Evansville to Crane is scheduled to be complete by the end of the year.
The road is scheduled to re-open to traffic by the end of November.