Part of Firehole Lake Drive, a scenic one-way road off of Yellowstone's main loop, was shut down for repairs when oil bubbled to the surface, damaging the blacktop, the Park Service said in a statement. The closure doesn't affect the Grand Loop Road, which sees 20,000 visitors per day during the summer. Park spokesman Dan Hottle told Live Science that Firehole Lake Drive's surface hit 160 degrees Fahrenheit (70 degrees Celsius) on Thursday, about 30 degrees to 40 degrees F (17 to 22 degrees C) hotter than usual. The park has previously closed Firehole Lake Drive for repairs due to heat damage, Hottle said.
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