This popular technical climbing area at Otter Cliffs in Acadia National Park was closed this week after several sedan-sized boulders broke off the oceanside cliff face, creating a dangerous situation with loose rocks and the potential for further collapse.—PHOTO COURTESY OF STEWART WEST

ACADIA NAT’L PARK — A rockslide involving boulders larger than some cars has indefinitely closed ocean-side climbing areas at Otter Cliffs. Park officials must decide where and what kind of anchor to install in order to make the area safe for climbing, said ranger Stuart West.

When the park’s two expert climbers – David Smith and Therese Picard – inspected the area this week and removed debris, they found chalk marks – an indication that someone has already climbed on the new and unstable rock face. The park also received reports over the weekend that at least one climber had disregarded the signs. “This could have been a real tragedy,” said Mr. West.

After inspecting the cliff face, Mr. Smith and Ms. Picard dislodged another vehicle-sized boulder that was precariously balanced. Daylight could be seen beneath it.

Anyone found climbing in the closed area can be fined $100. Climbers in violation will be ticketed, not given a warning, said Mr. West.