Yes. Several types of whales are in Alaskan waters and offshore. In fact, they migrate between Alaska and California or Hawaii every year.

If I build a structure that is sloped 30 degrees cone from the surface of the ocean down to 150' below the ocean surface(500' across), what kind of sea life would end up growing/sunning on it if we are around 30 miles from shore in 500-2000' deep waters.

Would whales be an issue near Alaska? The location could be anywhere in the world.