The bridge closure isolates key areas of Mount Rainier National Park. A $1.5 million study will determine next steps.

The closure will pinch recreational access to Mount Rainier National Park, rendering two of its precious few entrance points inaccessible heading into summer.

The Washington State Department of Transportation said on Tuesday that the single-lane Route 165 Carbor River/Fairfax Bridge near Carbonado will be closed to all vehicles, bicyclists and pedestrians.