Unit B4

The Killdeer Mountains and Achenbach Hills serve as the dominant geographic features, providing natural focal points for glassing and navigation. Key drainages—One-O-One Creek, Devitt Creek, and Charbonneau Creek—cut through the prairie and offer travel corridors and water access. The Yellowstone River to the north forms a major boundary reference.

Notable buttes including Foreman Butte, Burning Mine Butte, and Lone Butte punctuate the landscape as visible landmarks. Several named springs such as McPeak Spring and Overlook Spring provide reliable water sources for hunters planning multi-day efforts in this arid country.

The unit spans low-elevation prairie country, with most terrain between 1,800 and 2,500 feet, punctuated by buttes and ridge systems reaching toward 3,300 feet. Habitat is overwhelmingly open grassland and sagebrush plain—roughly 86% of the unit is treeless prairie—with scattered pockets of timber in draws and along drainage bottoms. The Killdeer Mountains and Achenbach Hills provide the primary rocky terrain and higher elevations where mountain sheep habitat exists.

These ridge systems offer escape terrain, vantage points, and the broken country necessary for sheep survival in this otherwise open landscape.

A fair network of maintained roads—roughly 1.5 miles per square mile—provides reasonable access throughout the unit, with Highway 2 and several county routes offering main corridors. Most access is via private ranch roads requiring permission; public land access points exist but are interspersed within private ground. The low terrain complexity means navigation is straightforward once you're in the country.

Pressure is likely moderate to low given the vast acreage and the difficulty of hunting sheep habitat on a landscape where two-thirds of the ground is private. Early season sees the most public land use.

Unit B4 covers roughly 1,700 square miles of north-central North Dakota, encompassing a diverse badlands landscape of rolling prairie, isolated buttes, and coulees. The unit is defined by the Killdeer Mountains and Achenbach Hills—modest rocky ridges that rise above the surrounding grassland—along with drainages feeding the Yellowstone River system to the north. Small communities including Alexander, Harding, and Dore provide staging points and supply access.

The landscape is predominantly private working ranch and grassland, with scattered public land parcels interspersed throughout the rolling country.

Water is moderately available across the unit through a mix of perennial streams, seasonal creeks, and reliable springs. The Yellowstone River system dominates the northern drainages. One-O-One Creek, Devitt Creek, and Mule Creek provide year-round flow in their corridors.

Scattered springs including McPeak, Hagan, Overlook, and Achenbach offer reliable water for hunters working the ridge systems and buttes. Small reservoirs and stock dams supplement surface water, though their seasonal reliability varies. The main canal system serves agricultural areas but provides limited hunter access for water needs.

Desert bighorn sheep are the primary target in this unit, with habitat concentrated in the rocky outcrops and ridge systems of the Killdeer Mountains and Achenbach Hills. The broken butte country and coulees provide sheep escape terrain and bedding areas away from the surrounding open prairie. Hunting strategy focuses on glassing the ridges and high points—Foreman Butte, Lone Butte, and Kummer Ridge—to locate rams, then planning stalks through the broken draws and coulees.

Early season offers the best access and highest success potential. Water is adequately distributed, reducing the need for sheep to key on specific sources. Success depends heavily on securing private land permission and understanding sheep movement between ridge systems across the scattered public parcels.