Unit 21

Key navigation landmarks include Devils Monument for orientation across the wide country, and the distinctive Red Wall and The Wall formations that help break up the landscape. Basin features like Bobcat Basin provide natural gathering areas, while major drainages—Million Creek, Lost Creek, and North Poker Creek—serve as navigation corridors and potential water sources. Ridge systems like Wide Divide Ridge and Harlan Ridge create subtle high ground useful for glassing and travel routing.

The Trap at an obvious bend and named parks areas like Poker Creek Parks help hunters navigate the seemingly endless flats. These landmarks are critical for establishing location in country where distances can fool you and features repeat monotonously.

The unit ranges from around 4,600 feet in the lower valleys to just over 8,500 feet on the highest ridges, with most productive country sitting in the 5,000 to 6,500-foot band. Vegetation is sparse—sage, greasewood, and dry grasslands dominate the open flats and slopes, with scattered juniper and low conifer timber clinging to north-facing aspects and ridge tops. This open character creates excellent glassing country where you can see across vast distances, but it also means limited thermal cover and exposed travel.

The landscape reads as classic high plains: big sky, sparse vegetation, and terrain that appears flat from a distance but reveals subtle benches and drainages on closer inspection.

Nearly 283 miles of roads lace the unit, but with no highways or major routes traversing it, access is limited and scattered. The network consists primarily of county roads and ranch access routes radiating from Kaycee and Barnum, providing entry points but not creating a dense road system. This creates moderate pressure patterns—accessible enough for typical hunters but not so connected that every drainage gets hammered.

Most hunting pressure concentrates on roads and near reservoirs; the country between major roads and away from water sources receives less attention. Navigation requires careful map study; the road network can mislead—what looks accessible sometimes requires knowledge of which ranch roads are open.

Unit 21 encompasses the high plains country between Kaycee to the north and Barnum to the southwest, bounded by Interstate 25 on the east and Wyoming Highways 190 and 191 on the southern and eastern margins. The unit sprawls across Natrona and Washakie County lands, covering a vast expanse of lower-elevation terrain that transitions from plains into low mountain foothills. This is classic northeastern Wyoming antelope country—wide-open and wind-exposed—where the landscape stretches broadly with few vertical obstacles.

The terrain sits well below timber line, with terrain complexity driven by distance and subtle topographic features rather than dramatic elevation change.

Water is the critical limiting factor in Unit 21. Scattered springs—Jacques, Taylor, Carr, Turkey Springs, and Antelope Springs—mark reliable water locations that often concentrate game. A series of reservoirs including Rock Spring, Keith, Three Forks, Chocolate, Ellis, King, Willow, and others provide water during hunting season, though some depend on runoff reliability. Major creeks including Million, Lost, North Fork Dead Horse, and North Poker Creek drain the unit but may be intermittent.

The limited water availability makes each source strategically important; knowing the reliable water locations separates efficient hunting from wandering. Several irrigation ditches and canals cross the unit but shouldn't be relied on.

Unit 21 is exclusively pronghorn country, and the vast, open terrain defines the hunting approach. These plains support significant pronghorn populations that migrate seasonally between low winter grounds and higher elevation foothills. Early season finds animals spread across the widest country, requiring glassing from high points like ridge systems and buttes to locate groups.

Mid-season rut activity concentrates bucks in traditional territories, often near water and near the scattered breaks. Late season pushes animals toward lower elevations and reliable water sources. Success requires patience and optics—long-range glassing to locate pronghorn, then planning stalks across open country where concealment is minimal.

Water sources become critical; pronghorn must drink regularly, and setting up on approach routes to reliable springs yields encounters.