Crews at Yellowstone National Park are improving four hiking trails this summer as part of a long-term project to rehabilitate the most heavily used hiking trails in the park.

The Yellowstone Park Foundation recently received $100,000 from the National Park Foundation to help pay for the project.

The nonprofit Yellowstone foundation last year completed a drive to raise $2 million for trail restoration in the park.

To date, 16 trails covering more than 70 miles of trails have been rehabilitated.

The National Park Foundation is disbursing $500,000 to the Yellowstone Park Foundation at $100,000 per year over five years, from 2007 through 2011.