Emergency services were called to a vehicle crash on Mangapapa Bridge, SH38, near Frasertown overnight.
One vehicle with one occupant was located.
The sole occupant, a 23-year-old man from Wairoa, was found deceased.
Indications are that the vehicle may have struck a bridge abutment before coming to rest on the other side of the bridge.
The cause of the crash will be examined by the Serious Crash Unit.
Police Media Centre