Thanks Bea and Jason.
Bea, all of these were taken from the angled bank under the end of the bridge, shooting up and under where the sidewalk is. And yes, I need some sort of flash extender as I tried the 550ex flash the other day and it didn't do the job. Too far out to the first nests, say 35-40 feet or so.
Jason, the rocks under the end of the bridge where I was are big, but not big enough to be stable. Some of them tilt when you walk on them, and a couple times I almost fell. There was a guy in a boat, fishing, and he must have seen me wobble, cause he even yelled out. 
Not sure what the heck the sparrow thought he was doing, but the swallows didn't pester him. Crazy bird.