The U.S. Forest Service has shut down six campgrounds on the Oregon coast because of the coronavirus outbreak, marking what appear to be the first campground closures in the state.

The six “concentrated-use” campgrounds are located at places popular among those who tour dune areas in off-highway vehicles like ATVs, dirt bikes and dune buggies. Four of the closed campgrounds are at the Oregon Dunes National Recreation Area on the south-central coast, and two are at Sand Lake Recreation Area on the north coast.

The campgrounds affected are Horsfall, Horsfall Beach, Spinreel, and Driftwood II at the Oregon Dunes, as well as East Dunes and West Winds at Sand Lake. All six will be closed starting Wednesday through April 14.

READ MORE: Can I still go hiking in Oregon during the coronavirus outbreak?

Unlike coastal campgrounds with separated, individual sites, these campgrounds are more like parking lots, where large groups form tight circles of campers and trailers, the U.S. Forest Service said in its announcement. During busy times like spring break, there can be a “festival-like atmosphere."

“We know how important outdoor recreation is to so many people,” Donna Mickley, acting Forest Supervisor said in a news release. “And so this is not a decision we made lightly. We’re committed to continuing to provide services for visitors in this challenging time while also making sure we’re keeping employees, volunteers, and the public safe."

All other U.S. Forest campgrounds, trails and recreation sites are still open, as of Wednesday. Oregon state park sites and campgrounds also remain open.

--Jamie Hale; jhale@oregonian.com; 503-294-4077; @HaleJamesB

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