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ALAMOSA COUNTY, Colo. (KDVR) — Update, 9:45 p.m. Great Sand Dunes National Park reopened around 8:15 p.m. after lightning sparked a fire there Wednesday afternoon.

The 306-acre Medano Fire was 80% contained, according to park officials. Fire crews were expected to work through the night until the fire is fully contained.

Original: A fire has sparked inside Great Sand Dunes National Park, according to park officials.

The National Park Service for the area tweeted it was started by a lightning strike in the grasslands along the entrance road along Highway 150.

Inbound traffic and the visitor center were closed, but there were no other evacuations at of around 4:30 p.m., park officials said.