Several popular trail crossings were wiped out across the Nooksack River.
The debris flow of mud, boulders and trees raced down the Middle Fork of the Nooksack River faster than any hiker could get out of the way.
There is not much left where a popular trail used to cross.
The flow was caused when a large chunk of the melting Deming Glacier gave way.
The force of the slide was powerful enough to move boulders.
It was even picked up by the Pacific Northwest Seismic Network.
Because of the flow, the Forest Service is warning hikers near Mount Baker to be on guard.
As the weather warms, more fast moving flows could come without warning.
Thankfully, this latest flow happened in the middle of the night.
The Forest Service worries then next one could come when hikers are in it's path.