Dunlap sits inside the Loess Hills, tall ridges of windblown soil running along the Missouri River valley that are found in only a couple of similar landscapes anywhere in the world — hills steep enough that a plowed driveway out here often runs at an angle a flatlander would find surprising. HANIGANS LLC works those hillside driveways and the town's streets along old Highway 30, clearing walkways and running de-icer on the grades where a plowed surface can refreeze into something a car simply won't climb. The Boyer River valley nearby collects cold air overnight, so a morning here can start ten degrees colder than the ridge above it, and the crew reads that difference into the order it works a route. In-town blocks get cleared to bare pavement along the sidewalks near the old Lincoln Highway storefronts, while the outlying hill properties get the grade-specific attention their driveways actually need. It's snow removal built around one of Iowa's strangest and most striking landscapes, where the hills themselves decide how a storm behaves.