Extensive damage from recent flooding has prompted the National Park Service to close the Ozark National Scenic Riverways.

About 150 people including, staff from the park and National Park Service employees from across the country, are working on cleanup efforts, Alexandra Picavet, a regional spokeswoman for the Park Service, said Wednesday.

The park closure includes the Current and Jacks Fork rivers, some roads and all facilities and campgrounds.

"This is going to take a long time, even once we're open," Picavet said. "It's going to be an ongoing process."

A junior park ranger event was canceled earlier this month.

Picavet said employees and experts have been working 12- to 14-hour shifts cleaning, assessing and repairing damage. The total cost of damage to the area is unknown.

Debris around the campgrounds, facilities and roads includes sand, mud, gravel and tree scraps. In the river other items such as nails, glass, propane tanks and pieces of structures have been discovered.