This is a highly recommended portage.  Trail is on river left.  Jarbidge Falls is formed by a large rock slide coming down the right bank.  Keep an eye out for the rock Talus and a large (house or bus) sized rock signaling the beginning of the falls.  

Be sure to pull out above the large rock.  You don't want to miss the eddy and accidentally run this.

Admire it as you portage around it.