The Wailua River Bridge will close temporarily as crews conduct emergency repair work on nearby power lines.
A live wire fell onto Kuhio Highway Wednesday evening.
The mauka bridge will be shut down starting at midnight between Thursday and Friday. All traffic will be detoured to Cane Haul Bridge, which will be contraflowed.
Drivers should use caution, expect delays and adjust travel times or avoid the area altogether.
The Kauai Island Utility Cooperative (KIUC) will determine when it is safe to reopen the bridge.