When I used fish it , I would throw right up under the waterfall , and slow roll it back.
It gets crowded down there, so good luck . Also try top water daylight and dark, in the pool below waterfall,
I am sure a lot of fish have gone over dam with all the rain we have had.
Pm me your results , please. Posting a positive report on the open forum about that spot will bring you lots of company.
Mosquitoes will try to carry you away when it gets dark.