The letter says the Indiana Finance Authority, Isolux Corsan, and I-69 Development Partners are negotiating to come up with a "Memorandum of Understanding."
A truck hauling a large load collided with the Rockville bridge, damaging four of the concrete beams.
Low-income or minority community members who might be impacted by the extension will receive surveys from INDOT.
Environmentalists have fought the 47-mile tollway plan, arguing it would threaten the Midewin National Tallgrass Prairie south of Chicago.
Indiana officials are asking motorists to be more watchful for deer on the state's roadways as fall weather and mating season approach.
More than 60 rural communities around Indiana are sharing nearly $80 million in federal funding for road and bridge improvements and other projects.
INDOT calls the employee's email "an inappropriate use of INDOT resources."
The Bloomington company halted work on the project earlier this month because the private developer owed Crider and Crider more than $2.3 million.
Bloomington's mayor says at least one subcontractor walked off the job Friday because of an ongoing pay dispute.
The I-65 project between Greenwood and Franklin has caused delays since April 2015.