It will be open at weekends, from 6pm on Fridays until 8am on Mondays.
Detours would be in place along Maheno-Kakanui Rd, Fortification Rd and State Highway 1 for weekday traffic as crews undertook "quite a bit of structural repair work" underneath the bridge, Waitaki District Council roading manager Michael Voss said.
The bridge would remain open to pedestrians throughout. About 1220 vehicles cross the bridge daily. The work will cost $183,000.