It’s usually over grown with prairie grass. The year of the battle that grass was very green.
There are controlled burns from time to time.
You need to go visit. You can see that battlefield, Rosebud battlefield & Pompey’s Pillar in one day if you like.
All have massive historical importance.
As long as a person is in the neighborhood, I would recommend traveling into Wyoming and visiting the battlefields around Fort Phil Kearney. Not far and worth the visit to see some famous sites from Red Cloud's War (The Wagon Box Fight and The Fetterman Massacre). The Fetterman Massacre was the other, lesser-known battle between the Dakota and U.S. troops which also had no survivors among the U.S. troops (81 fatalities). These troops were to protect Fort Phil Kearney and were lured into an ambush by a small group of Dakota led by Crazy Horse whose reputation as a warrior was now becoming known to the whites