This new part of the path along the Penobscot River goes from the area of High Tide Restaurant, under the Chamberlain Bridge, and down by the intersection of Betton and Penobscot Street.
The city celebrated with some all day family fun.
We're told by the area's youngest residents, the touch-a-truck portion was their favorite.
"I've spoken with people all throughout the area who've decided to spend the day here," said Brewer Police Department's Public Safety Dir. Jason Moffitt.
This second phase of the Brewer Riverwalk has been years in the making.
The first part was unveiled in 2013, after city leaders worked in the years before to stop erosion along the shore and clean it up.
"The river started getting clean. The city started realizing that the river is not a liability, but it's actually an asset," said Darcy Main-Boyington, Brewer's Economic Development Director.
To finance this second phase, city leaders said they relied heavily on federal grant money, that Senator Susan Collins and former Congressman Michael Michaud helped to get.
"It's going to bring even more visitors to this area. It's an opportunity for friends, family, and neighbors to get together and have fun," said Sen. Collins.
And city leaders said the effort to draw locals and businesses to Brewer's waterfront is working.
"We've already had lots and lots of businesses contacting us the last few years since the first phase of the riverwalk opened, and businesses are specifically asking to be on our waterfront," said Main-Boyington.
She said the long term goal is to extend the Brewer Riverwalk even further, down to the Veteran's Memorial Bridge.