I'd forget any thoughts of diving altogether. Even if it's deep enough this creek is filled with huge boulders. Up to the narrows it's only necessary to cross ankle deep water under average conditions. Past the narrows is another story. You can rock scramble the south bank only so far.
Mandatory swims are inevitable.
Be careful in the water. Huge boulders under the water are waiting to knock your knees. Go a week after the last rain for best visibility into the water. Clarity in sections is amazing, up to six feet deep. I could see eight inch fish swimming near my feet.