An overweight truck has apparently damaged two key bridges along Kaua'i's North Shore.

Authorities are placing new weight limits on the bridges as preparations are made to replace both with temporary structures.

The bridges are over the Wainiha River and a nearby stream, both of which flow into Wainiha Bay.

County officials say they expect to replace both bridges by mid-December.

Meanwhile, temporary repairs have been made to broken tension rods and light traffic is being allowed along the road that connects the Hanalei area with the rest of the Garden Island.

Officials say a truck weighing up to 20 tons may have damaged the bridge. Vehicles now will be limited to three tons, except for emergency vehicles, trash, sewage disposal, propane delivery and food services.