A hole in a bridge has closed a section of State Highway 53.
The bridge, which goes over the Tauherenikau River between Featherston and Martinborough, was shut just before 3pm today.
The hole is an estimated 75cm wide.
The New Zealand Transport Agency (NZTA), which manages the state highway, said heavy rain last Friday raised water levels in the Tauherenikau River, undermining the road near the bridge.
NZTA was notified to the washout today.