In this view across the lake, the grate toward the right is above the lake's outlet. The closer horizontal embankment is a street, while the farther one supports a railroad. The lake drains through tunnels in both.
My homeowner's association dues at work. These men are plowing and salting the paved walkway that runs roughly parallel to road, between it and the lake.
Another section of the walkway, away from the road, remains unplowed. However, the two parallel grooves in the snow indicate that someone has pulled a two-wheeled vehicle down the walkway. I was thinking that the grooves could have been made by bicycle tires, but their paths extend at a constant distance from each other, indicating that they would have to be made by two wheels connected by an axle. Has one of my neighbors been riding a chariot?