It appears to be a color variant of some type from the Genus Faxonius. What area of the US are you?
This genus is common throughout the North Eastern US. Some possible matches:
Faxonius obscurus (Allegheny crayfish) https://www.inaturalist.org/observations/22197953
Virile Crayfish (Northern Crayfish)
Calico Crayfish (Papershell Crayfish)