I am not sure what kind of birds these are. Some sort of hawk I assume. They can often be seen doing circles over Trillium Lake. All of a sudden, they rapidly drop down and pull a big fish out of the water. That was what I was waiting for when I took these, but they never dove.
UPDATE: Due to the help I received in my blog comments, I'm going to agree with the majority and say these are osprey. Thanks for your help everyone!