I mainly fish flies.
For salmon its most often streams on 5 or 6x long shanks but am usually lower on the river than you are talking.
Big and bright.
The longer they have been in the river the more shellshocked they become.
Farther up I fish mostly 4 or 6s 2 or 3x long.
On the other hand I took a number of kings in the lfz on 5-6 inch long intruder flies tied on 7x long streamer hooks with the hook cut off and a #2 trailer hook.
Good luck to you as that early can be totally hit or miss.
Rarely a full on run going on at that time but pods of fish can be anywhere.