Pines grow on the bluffs above the Iowa River here in a way that's unusual for this part of the state, holding their green and their snow load through the winter while the oaks and cottonwoods around them go bare, and that mix of cover means some yards in Iowa Falls stay shaded and icy long after open ones have dried in the sun. Iowa River Tree Service works those shaded drives and walks in winter, learning block by block which pine drops its snow load all at once and which yard holds ice under a stand of cedar until noon. Downtown streets, lined with older shade trees planted back when Iowa Falls was a busier railroad stop, need regular clearing along the curbs where branches overhang the parked cars. The bluffs themselves keep the river corridor a few degrees colder than the flat ground just outside town, and that temperature difference shows up as the last patch of ice on an otherwise clear street. Working from the bluffs outward, rather than treating every block the same, is how the crew keeps ahead of it.