Niland boat ramp

I don't know anything about a boat ramp in Niland, but I'm pretty sure there's a marina in Bombay Beach where someone once scored a houseboat that was hauled back to the slabs. I haven't been there in a while, but I can't imagine a boat ramp popped up.
 
Seems like it's probably the one I'm thinking of in bombay. If you're already that close, you might as well just go to the slabs.
 
You won't need to worry about the crossing on your way in, only on your way out. I definitely wouldn't eat anything from the Salton sea, but I don't eat seafood anyway. Pretty sure it's not recommended, though. I've heard it described as a post-apocalyptic wasteland.. might be worth seeing on your way into the slabs.