Unit 108

The Atlantic Rim forms the unit's most prominent landmark—a visible escarpment useful for orientation and glassing longer distances. Fivemile Ridge runs east-west and marks portions of the northern boundary. Miller Hill and Middlewood Hill serve as recognizable summits for navigation.

Muddy Creek and its tributaries—including Littlefield Creek, Stoney Creek, and Muddy Spring Creek—function as both water sources and natural travel corridors through the unit. Bridger Pass lies at the western approach and is named on maps. Ninemile Spring, Beckman Spring, and Deadman Springs provide reliable water sources scattered across the terrain.

These features collectively create a logical navigation framework for hunting movement.

Elevations span from roughly 7,000 feet in the basins to just above 8,500 feet on the ridges—a modest vertical relief that creates distinct habitat zones. The unit is predominantly sagebrush steppe with scattered ponderosa and juniper on higher slopes and ridgetops. Forest cover remains sparse overall, keeping the country open for long-range observation.

Lower basins like Sage Creek and Eightmile Lake support denser sagebrush and some riparian growth along drainages. The Atlantic Rim rises as the dominant topographic feature, providing a natural geographic anchor and glassing platform. Seasonal moisture influences vegetation density, particularly in tributary canyons.

The unit offers fair but straightforward access via 120 miles of BLM and county roads. Primary access routes run through Sage Creek Road, McCarty Canyon Road, and Muddy Creek Road from the north and east. Bridger Pass Road provides western entry.

Most roads are graded BLM routes suitable for standard vehicles, though conditions vary seasonally. Highway 71 offers quick access from Rawlins, keeping the unit moderately accessible but not heavily trafficked. The flat terrain complexity suggests most pressure concentrates near water sources and the more obvious approaches.

Hunters willing to walk away from roads can find quieter country, particularly on ridges and in upper basin reaches.

Unit 108 occupies the Atlantic Rim country south of Rawlins, bounded by Wyoming Highway 71 on the north and east. The western and southern boundaries follow a series of BLM and county roads: Sage Creek Road, McCarty Canyon Road, Miller Hill Road, and Muddy Creek Road, with the western limit defined by Bridger Pass Road and Muddy Creek. The unit's geographic core revolves around the Sage Creek and Eightmile Lake basins.

Rawlins serves as the primary reference town to the northeast, approximately 15-20 miles away. The relatively straightforward boundary makes orientation manageable for hunters unfamiliar with the area.

Water availability is limited but concentrated along specific corridors, making water sources critical to hunting strategy. Muddy Creek flows through the unit's western and central portions, fed by several permanent and seasonal tributaries including Littlefield Creek, Stoney Creek, Grove Creek, and Pine Grove Creek. Beckman Spring and Ninemile Spring offer reliable water in areas away from major drainages.

Miller Hill Lake and Eightmile Lake provide perennial water in the basins, though Lake Miller sits at the eastern margin. Smaller reservoirs including Adams Reservoir and Little Sage Creek Dam support local water supply but may not be reliable for hunting purposes. The basin areas tend to hold moisture better than exposed ridges, making them priority location checks during dry periods.

Pronghorn are the historical focus in Unit 108. These animals utilize the open sagebrush basins and ridge systems year-round, with seasonal movement patterns driven by water availability and vegetation phenology. Early season favors glassing from ridgetop vantage points like Fivemile Ridge and the Atlantic Rim to locate concentrations in lower basins. Water sources become critical pressure points as summer advances—Muddy Creek and its tributaries concentrate animals during dry periods.

Mid-season hunting involves careful approach and stalk through sagebrush toward groups using binoculars from distance. Late season often pushes animals into creek bottoms and higher drainages where pockets of green vegetation persist. The sparse forest allows long-range glassing but provides minimal cover for stalking—patience and early movement are essential.