HD 420 covers the lower Yellowstone River corridor around Sidney and Fairview—the country where the Yellowstone winds toward the North Dakota border before joining the Missouri at the Confluence. Elevations run from about 1,900 feet on the Yellowstone bottom to 2,800 feet on the higher prairie benches and breaks. The country is irrigated farmland in the river bottom (sugar beets, malt barley, corn, alfalfa—real ag here, not just dryland wheat), with cottonwood gallery forest along the river and its sloughs, sage benches and breaks above the floodplain, and rolling prairie further out. Whitetail are dense in the river bottoms—the lower Yellowstone is one of the better whitetail corridors in the state and has produced trophy-class bucks for a long time. Mule deer use the breaks above the bottom; pronghorn work the dryland; some elk filter through the breaks; sharp-tailed grouse and pheasant in the cropland edges. Mostly private—farms, ranches, irrigation cooperatives—with scattered DNRC state sections and small BLM tracts. Sidney sits on the edge of the Bakken oil play and the town has expanded and contracted with energy prices over the last fifteen years; you'll see oil-patch activity and the housing/labor pressure that goes with it. Block Management is critical. MT-16 north-south, MT-200 east-west, and county roads handle access. Sidney has full services—gas, hospital, motels, Walmart, the Yellowstone-Mer-Cer area chain stores driven by oil-patch traffic. Cell service is good thanks to the oil-patch buildout. Section roads gumbo when wet. The whitetail rut along the lower Yellowstone is genuinely productive for hunters with permission or a BMA stamp.