Nope. I am not sure exactly when, but it is silted up really solidly, with grass and stuff growing in it.
I played around with it some, to see if I could get the fairly fast-moving drainage stream to start to clear it, and by the time I was done it had dug fairly deeply into one hole in the grate, but I'm not too sanguine.
I did at least clear the cross-walks of the leaf-bounded lakes they had developed. For now, that is.