Six dog teams and the park's helicopter, in addition to rangers on horseback and foot, began searching for Jessica Rose Garcia after she didn't show up for her 9 a.m. Saturday shift at the Wawona Hotel.
An employee of DNC Parks & Resorts at Yosemite Inc., Garcia was scheduled to arrive for her first day of work at the hotel, officials said in a news release.
Rangers checked her park residence Saturday morning, but she wasn't there. She last was seen Saturday about 11:30 a.m. by a co-worker, walking east along Forest Drive near the stables in Wawona, according to park rangers.
Rangers say Garcia had just come from an orientation meeting with her supervisor at the hotel.
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Garcia was wearing her work uniform: dark green polo shirt with the DNC logo, black slacks and black Rockies work loafers. She was wearing her dark green jacket, which has the DNC logo on the left side of the chest.
She's described as Latino, 5-feet-3-inches tall, about 170 pounds, with shoulder-length black hair and brown eyes. Rangers said Garcia is fit and hikes regularly. She's been called shy and reserved around strangers.
Garcia had her cell phone and personal identification with her, park rangers said.
Rangers have searched in the area of the south fork of the Merced River and the Wawona area.
Anyone with information about her whereabouts should call the Wawona Ranger Station at (209) 375-9520 or Yosemite dispatch at (209) 379-1992.