A neighbor who lives nearby emailed to say that as trucks and busses travel over the 2 foot wide trench, they make a terribly loud sound. She wondered if there was anything I could do.
It took exactly one call to the folks at DDOT Public Space to figure out what the problem was and how to fix it. Once the rain stopped, contractors were out to temporarily fill the trench while work is done elsewhere for another month or two. You can see the results below: