Unit 81
High-elevation rolling country straddling the Wyoming-Colorado border along the Continental Divide.
Hunter's Brief
Unit 81 sits in the high country where the Continental Divide defines the western boundary, with rolling terrain spanning roughly 8,000 to 11,000 feet. The landscape is a mix of open parks and moderate forest, dotted with reservoirs and reliable creek systems that make this country huntable despite limited flat ground. A network of rough roads and ditches provides access across the unit, though terrain complexity means knowing the country pays dividends. Mule deer thrive in this elevation band, with white-tailed deer in pockets of lower drainages.
- Compact: under 200 sq mi
- Moderate: 200 - 800 sq mi
- Vast: over 800 sq mi
- Few: under 25%
- Some: 25 - 60%
- Most: over 60%
- Limited: under 0.7 mi/mi² (backcountry)
- Fair: 0.7 - 1.5 mi/mi²
- Connected: over 1.5 mi/mi² (well-roaded)
- Flat: under 20% mountains
- Rolling: 20 - 55%
- Steep: over 55%
- Sparse: under 20%
- Moderate: 20 - 50%
- Dense: over 50%
- Limited: under 0.3% area
- Moderate: 0.3 - 2% area
- Abundant: over 2% area
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Landmarks & Navigation
Doane Peak and Red Mountain serve as prominent reference points for orientation across the rolling terrain. Long Lake and a network of named reservoirs—Brownlee, Pearl, Gunst, and others—provide reliable water features for navigation and hunting strategy. Major drainages like the East Fork Encampment River, Willow Creek, and Hell Creek cut through the unit, offering natural corridors for travel and deer movement.
These creek bottoms function as navigation aids and hunting routes, with Hog Park Creek and North Soldier Creek providing eastern reference lines. The numerous named parks and draws—Box Canyon, Slaughterhouse Gulch, Mason Gulch—give hunters concrete landmarks for communicating positions and planning movement across country.
Elevation & Habitat
The unit spans upper-elevation terrain between 7,100 and nearly 11,000 feet, with the core hunting country sitting around 8,500 feet. Rolling mountains rather than steep peaks characterize the topography, creating extended ridges and benches suitable for glassing. Moderate forest coverage means a patchwork of timbered slopes and open parks—named features like Beaver Dam Park, Commissary Park, and Dead Horse Park reflect the actual landscape composition.
This elevation and habitat mix creates strong mule deer country, particularly along the transition zones where timber meets open benches. The higher elevations support cool-season range, making this unit attractive during early season when deer are still at elevation.
Access & Pressure
A fair network of roughly 165 miles of road provides access corridors but rarely creates the dense road systems found in more developed units. These routes—primarily rough ranch and Forest Service roads—offer staging points but require careful interpretation of current conditions and gates. Access concentration likely follows the creek valleys and park systems, meaning savvy hunters can find solitude by avoiding obvious staging areas and main ridgelines.
The rolling terrain complexity (6.6/10) is high enough to reward local knowledge and detailed planning; straightforward access doesn't translate to straightforward hunting. Wyoming Highway 230 and Highway 70 frame the unit but don't provide direct entry, keeping casual traffic minimal and pressure manageable.
Boundaries & Context
Unit 81 occupies the borderlands between Wyoming and Colorado, anchored by the Continental Divide to the west and Wyoming Highway 230 to the east, with Highway 70 forming the northern boundary near Riverside. The unit is moderately sized and dominated by public land, offering substantial terrain between these major geographic and political boundaries. This positioning puts it directly in transition country where the high Rockies give way to the slightly gentler terrain of south-central Wyoming.
The unit's location ensures it draws hunters from both states, though relative isolation from major population centers keeps pressure moderate compared to more accessible areas.
Water & Drainages
Water sources are limited but present in key locations, making drought-tolerant strategy necessary in some areas. Multiple reservoirs including Brownlee, New Rollman, and Rolled Rollman Reservoir provide reliable water, though they're concentrated rather than distributed across the entire unit. Natural springs like Rock Springs supplement the system, and creek drainages including the East Fork Encampment River and Willow Creek maintain flow through much of the season.
The network of irrigation ditches—Casteel, Toothaker, Henry, and others—suggests agricultural heritage and potentially seasonal water patterns. Hunters should identify and locate major water sources before entry; relying on springs and small creeks requires confidence in backcountry navigation.
Hunting Strategy
Mule deer are the primary target, thriving across the rolling benches and park system at these elevations, while white-tailed deer occupy specific drainage bottoms and willow-lined creek systems. Early season hunting focuses on finding deer still at elevation on the open parks and ridges before they drift lower with cooling weather. The moderate forest and rolling topography create natural glassing country where binoculars and patience can cover significant ground from a few key vantage points.
Hunters should plan around the four major drainages—East Fork Encampment River, Willow Creek, and North Soldier Creek—as these corridors funnel deer movement and provide water-dependent concentrations. The park systems and named flats offer the best glassing opportunities; ridgeline travel often moves deer without providing sighting chances.
Weather & Conditions
?Historical normals, not a forecast
Built from 10 years of NASA POWER data (MERRA-2 satellite reanalysis) at this unit's location.
Temperatures and conditions below reflect the unit's dominant elevation band (High · 8800 ft — 57% of unit area).
For elevation-by-elevation detail and live planning tools, use the TAGZ app.
- Daytime high / Overnight low — median daily maximum and minimum for each day of the year.
- Shaded band — the 10th–90th percentile spread across years.
- Freeze line — 32 °F reference for frost & snow risk.
Year-round temperature
Moon phase
?Illumination for each night of the selected two weeks, computed from lunar ephemeris. New and full moons are emphasised — useful for planning around moonlight.Typical conditions
?A snapshot of the selected two weeks, from long-run daily normals at the unit's dominant elevation.
- Day / night — median daytime high & overnight low; the sub-line is the typical 10th–90th percentile spread across years.
- Wet days — days with measurable precipitation (≥ 1 mm, WMO standard). Not a forecast.