I have spent quite a bit of time on line trying to identify this caterpillar with no success.  I do not  believe though that it is a Orgyia detrita.  They look similar in appearance but the range is wrong.  This species has never been seen west of Texas.  I also am not sure if the 4 white structures on the back are part of the caterpillar or predator wasp eggs.  Try your local university or natural history museum  for help in identification.  You need a lepidopterist, this MG can not help, sorry.