Visitors will get free admission to the park surrounding the nation’s deepest lake today.

In celebration of the 91st anniversary of the creation of the National Park Service, Crater Lake National Park Superintendent Chuck Lundy has declared Saturday “Founder’s Day” and waived the usual $10-per-car fee.

“We hope that this celebration will promote a better appreciation of Crater Lake and why the National Park Service is here,” Lundy said in a press release. “National parks belong to the people, and this is one way that we can thank visitors for their continued support.”

The agency was established Aug. 25, 1916, by an act of Congress signed by President Woodrow Wilson.