The dam is 450 feet across the river's width, built to collect water for Seymour.
Since the plan was approved in 2018, the company said it has replaced or removed 54% of the lead service lines.
Customers will see average monthly rates increase about $24 a month.
The company says customers should only be inconvenienced for a day or two when flushing occurs in a specific neighborhood.
This will begin Tuesday, March 1, and run through Friday, April 1, on weekdays from 8 a.m. to 3:30 p.m.
Indiana American Water said to make sure you know where your main water shut-off valve is located in case of an emergency.
The company says the mobile unit will provide some water quality improvement in the city, while a new water treatment facility is built.
The company offered a few tips to avoid becoming a victim.
Mayor Treva Hodges said she knows it is frustrating, but the flushing is expected to help get rid of the brown water until long-term improvements are completed.
The flushing is expected to help get rid of brown water until long-term improvements are completed.