KEYSTONE LAKE, Oklahoma - The left lane of westbound Highway 412 is closed at the Keystone Dam exit after the Oklahoma Highway Patrol said a vehicle caused significant damage to the bridge there.

The on-ramp to westbound 412 is also closed.

Drivers should expect delays and are encouraged to find an alternate route.

A $9.5 Million project to replace the bridges at the interchange is expected to begin later this month.