There is, what appears to be, a Great Egret on the sandbars off of Eagle Point Park in Harrison Mills. I've been away for the last 10 days or so and when I got back this afternoon there was a phone message from a friend over in Eagle Point who had seen the bird about noon today.
I finally got down there this evening and I've taken some pictures but they will be very distant and blurry as the light was fading and the bird was quite far out. It is almost the size of a Great Blue Heron, but pure white with black legs and a yellow bill. There does not appear to be any feathering. When it flies, it flies with it's neck tucked in like a Great Blue and it feeds, wading in the water. When my friend saw it, it was being harassed by some Great Blues and this evening one flew past it, I'm not sure which made the noise but the noise we heard was exactly as described in Sibley's for a Great Egret.
I hope it sticks around, so some others see it and I'll try for better pictures tomorrow.
Kathy, what an incredible potential sighting. From the description it sounds like it is one. I can't see it being anything else that matches that description. I haven't heard of albino Great Blue Herons, but if they do exist, the legs would not be black. I'll probably be out there in the morning to see if it's around there.