Ummm Yeah there are plenty around there. My buddy and I were touring the park via street legal dirt bikes 2 years ago, came up to a traffic jam (they are constant) and low and behold there's a momma bear and her 2 cubs. Everyone else is in their cages (cars) and we're hanging our asses out in the breeze on the bikes.
So when momma gets tired of being the center of attention and decides to cross the road and go up the hill, guess where the most open area to cross is? You guessed it, right behind our back tires. Thankfully she wasn't mad, her and the cubs crossed the road literally about a foot behind our rear tires. That's why the following pictures are showing them in 2 different places, first two are the original position, second after they crossed. In between camera was hanging from my neck on the strap with me ready to ride over the Subaru in front of me if necessary.
Later in the day we came across another Sow and 2 cubs in another location close to the NE gate (Cooke City gate). After we got back from the trip we heard about an incident where a group of campers were mauled by a Sow and 2 cubs in a campground about a 1/4 mile from the 2nd location.