Firehole Lake Drive in Yellowstone National Park has been temporarily closed due to a damaged road surface.

Yellowstone spokesman Dan Hottle says extreme heat from surrounding thermal areas has caused thick oil to bubble to the surface, damaging the blacktop and creating unsafe driving conditions on the popular, scenic road, located off the Grand Loop Road halfway between Old Faithful and Madison Junction in the park’s Lower Geyser Basin.

The 3.3-mile loop drive takes visitors past Great Fountain Geyser, White Dome Geyser and Firehole Lake.

Hottle says the road will remain closed for the next several days while maintenance crews make repairs. The date for reopening the road is uncertain at this time, and will be determined after crews assess the effectiveness of their efforts.