From appearances in the photo, there are only two (maaaybe 3) real options. Alder and Willow Flycatchers are possible. But if I had to hazard a guess, I'd go Eastern Wood-Pewee. Apparent lack of any eyering and the very dark appearing bill are points in favor of pewee. However I don't think a solid ID can be reached here.
@Great Argus Lack of distinctive eye ring also made me suspect Eastern Wood Pewee, but I wasn't entirely sure of that ID. They are indeed correct for the time and location; Alder and Willow I would have to check (though I think far less likely anyhow).
