Hi! I'm looking to go fishing this Friday. Saw boats don't take reservation and are all first come first serve. I'm looking at the 3 lakes below:

 

Del Valle

Lake Chabot

San Pablo Reservoir

 

Which one of these would be the least crowded and would be able to get a boat at? How early do I have to show up to get a boat usually?

I would suggest your best bet would be getting to the lake you pick as early as possible. On a weekend, when the park/marina facilities opens. San Pablo and Del Valle have public launch ramps for gas powered boats, I believe Lake Chabot allows only allows battery or human powered watercraft (boats, canoes, kayaks) that you have to transport down to the marina from the parking lot.

It’s been a few year since I’ve been at Del Valle but it’s not busy on Fridays unless it’s a holiday.

Del valle is your best bet. Get there as soon as they open. Usually on a weekday boats won’t be sold out.

Del Valle will have boats but it gets super windy in the afternoon. I personally like San Pablo, never been crowded and more protected from wind since it actually has trees on the shores instead of dead grass.