Kim Hancock, 59, had been with a group of tourists at the famous Yellowstone National Park on Wednesday when she got too close to the animal, park officials said.
Wenk said Yellowstone bison should be managed like wildlife rather than livestock and the herd's size should not be exclusively determined by ranchers who live outside the park in Montana.
"When it crossed the boardwalk, the bison became agitated and charged the crowd, goring Hancock", the news release said. She was transported by paramedic ambulance to the Big Sky Medical Center in Big Sky, in good condition.
Millions of American and worldwide visitors crowd the park each year to view wildlife like bison and natural wonders like the Old Faithful geyser.
This is the second instance of a bison attacking a Yellowstone visitor this year.
The woman attacked on Sunday - Charlene Triplett, a 51-year-old employee of the hotel - was kicked multiple times in the head and torso.
Daniel Wenk initially planned to leave the National Parks Service next March when he opted to not take a transfer to Washington, D.C., but said his bosses told him to take a hike as soon as possible.
That's more than a 6 percent increase over past year (419,635 visits), and surpasses May 2016 (444,630 visits) as the busiest May ever in Yellowstone National Park. Park officials aren't sure if it was the same elk.
"Animals in Yellowstone are wild and unpredictable, no matter how calm they appear to be", officials wrote.
A crowded boardwalk in the Lower Geyser Basin in Yellowstone National Park on August 18, 2015.
"If you can't maintain these distances, turn around and find an alternate route", the park advised. In 2017, there was only one incident at Yellowstone of a visitor being injured by a bison while 2015 saw five such incidents.