There was one time decision not to have fireworks in Lake Union this year. The city of Seattle makes it returned as a part of SeaFair.
I want to capture this fireworks from different location than past several years. I've researched and found West Seattle as one of good candidate.
I made a PDF document as linked below which contains my research result.
I am hoping this helps finding your best shooting spot this year.
Below image was taken from Shooting Spot D with Plan B composition in my shooting plan. 340mm, ISO 100, f/11, 6sec
Timelapse Video: 200mm, ISO 100, [f/5.6, 1/125sec] ~ [f/11, 8sec], 10 sec interval