Theodore Roosevelt Island closed for up to three weeks starting Monday while crews remove diseased trees from the nearby trails.

The National Park Service said the closures, which began yesterday, come after a survey found damage from the invasive emerald ash borer.

Sections of the island’s trails will reopen on a rolling basis as diseased trees are removed. NPS announced last week the island would close as the storms that hit the area could have brought down some of the diseased trees.

From a National Park Service press release: