After paddling through some flatwater below Nugget Falls you'll see a small powerhouse on river right.  This signals the beginning of powerhouse rapid.  Enter the rapid towards river right near the house.  Keep right and follow the river a short distance below the house.  The river then splits into 2 channels with the main current going down the left channel.  The left channel is your class IV option.  The right channel is smaller but not as crazy and can be a class II-III sneak for those not wanting to run the main drop.

You can pull into the calm water above the powerhouse on the right bank and follow the road down to scout the rapid.