SAN FRANCISCO (CBS SF) — A woman who was hit by a large tree branch in San Francisco is in stable condition with serious injuries.

The 100-pound branch fell on Friday from a pine tree about 50 feet up. It hit the woman in the head as she was watching her kids in Washington Square Park.

Now the city supervisor who represents that area is raising questions about how the city manages trees in its parks.

Supervisor Aaron Peskin said this isn’t the first time it’s happened.

“We had a woman killed at Stern Grove,” Peskin said.

The Rec and Parks Department says the tree involved was last assessed six years ago.

Phil Ginsburg, director of the San Francisco Recreation and Park Department said, “We have 127,000 trees in our system.” He said that the department “could always use more resources,” including more tree maintenance crews. He said there are only between 20 and 30 people who do tree maintenance for the city.