Overnight works for the Waioeka Bridge in Ōpōtiki will start next week.
From Monday, the bridge will be cleaned and painted to prepare for a busy summer holiday season.
The bridge will be reduced to one lane between 6pm and 6am to minimise the impact on motorists and is expected to take more than three weeks.
The New Zealand Transport Agency's Bay of Plenty system manager Rob Campbell said scaffolding will be on the bridge from Monday morning.
The balustrades and bridge deck will be sprayed and cleaned in the evening.