The video description says there is too much mud around the edge for the horses to get to the remaining water.
A similar pattern occurred three years ago, but the BLM said the springs are flowing and the wells are pumping, so water deliveries weren’t needed.
The situation deteriorated over the next few weeks, and the government gave the OK to haul water.
A report from 2018 said the horses are confined to the area by a fence.
Western Horse Watchers Association 