The three bridges, and a new riverside landing at Dallington, are being funded by a $13.7 million grant from the Christchurch Earthquake Appeal Trust.
Finance and Performance Committee chair and Deputy Mayor Andrew Turner said the bridges will help reconnect communities on each side of the Ōtākaro Avon River.
"The construction of the bridges signals the start of the Council's work to develop the regeneration area into a valuable asset for Christchurch.
"These three bridges signal an exciting new chapter for the Ōtākaro Avon River Corridor, as we start to bring the Regeneration Plan for the area to life," he said.
"We want to encourage people to come and explore the Ōtākaro Avon River Corridor, and these new bridges will make it significantly easier for people to develop meaningful connections to the neighbouring communities and to the land itself."
The council published initial bridge designs for community feedback in June, and used the feedback to refine the designs of each.
All three bridges will be single-span, made from steel truss, with concrete decks and sliding, jackable abutments to mitigate lateral spread.
Work on constructing the bridges is expected to start in early 2021.