From ODOT this morning:
ODOT has closed the northbound lane of OR 99E about a mile south of the Oregon City Tunnel after maintenance crews spotted new cracks on a large rock slab inside the mesh netting on the hillside.
Northbound traffic has been shifted to the center median lane along the three-lane road. The slab, about five feet up on the hillside, needs to be removed to make sure it won’t threaten the road.
The northbound lane will remain closed Tuesday during inspection of the rock slab and full road closures may be needed during removal. ODOT will re-open the lane as soon as conditions are safe.