16, 2017, the wildfire is now about 90 percent contained.

Custer State Park officials expect containment of a South Dakota wildfire to increase after day shift crews complete their rotation. However, hiking trails and interior roads remain closed.

Park visitor services program manager Kobee Stalder says Saturday that the burros are being treated by a veterinarian. The blaze has consumed than 84 square miles (218 square kilometers).

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The Legion Lake fire that has burned an estimated 53,875 acres since Monday was listed as 53 percent contained, a big improvement since the figure was at only 7 percent on Wednesday. He said officials are clearing trees that have the potential of falling into roads.

"Mop up and patrolling operations will continue all around containment lines of the fire, including the Blue Bell Lodge area, State Game Lodge area, south along Highway 87, and east past the Custer State Park boundary along the west side of Highway 79", a release from Custer State Park Fire Information said.

The park just south of Mount Rushmore National Memorial is a top tourist destination, featuring hills with ponderosa pine and prairie.