In my past trips 260 cfs is still very doable to paddle upstream to the DAM. Rick, Daniel and myself went up in Dec when it was 300 cfs.
I am far from an expert or in shape paddler
and would not have a problem recommending anyone but young kids attempt GOING upstream at 260cfs.
NOW I have not gone downstream from the Hwy 16 bridge, so I can not speak to the ability to paddle back to the Hwy 16 bridge at 260 cfs.