Weeping Willows can grow big in a hurry
Unless you really know your willing to take care of it / prune it, they are, as Ken frequently says, for a tree for city lots. There are not a lot of them on lots in the city here, just a few, but when they are taken care of, they do look really nice and they stand out. They are a nice change from all the Norway and Silver Maples in just about every yard.
I don't mind caring for it, and I have almost a half acre, but I put it right in the middle front of the front yard. It's far enough away it can't fall on anything. I love the way it looks and am glad I put it there. I may have to do some more aggressive pruning in a few years to keep it in line, but since it's a willow, I think it will handle it just fine.
But they get huge in a hurry! I'm amazed at the growth in just over a year.
Just for reference, that circle is about 11' wide now and the drip line is a bit wider than the circle.
Here is a link that might be useful: Willow Growth