Unit 31

MESA/GARFIELD/RIO BLANCO

Rolling high-desert benchland carved by canyons, spanning Colorado River to White River divide with scattered timber and reliable springs.

Hunter's Brief

Unit 31 is a sprawling high-desert plateau broken by canyon systems and benches, with elevations rising from the Colorado River bottoms to forested ridges. The country alternates between open sagebrush flats and scattered ponderosa timber, making it varied terrain for multiple species. A network of 534 miles of roads provides fair access across the unit's challenging topography. Limited water sources mean knowledge of springs and seasonal drainages is critical to success. Moderate complexity—big country, but navigation and water discipline are essential.

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Terrain Complexity
7
7/10
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Unit Area
702 mi²
Moderate
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Public Land
58%
Some
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Access
0.8 mi/mi²
Fair
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Topography
49% mountains
Rolling
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Forest
34% cover
Moderate
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Water
0.2% area
Limited

Terrain Deep Dive

Landmarks & Navigation

Several landmark clusters provide navigation anchors. The Bookcliffs form the unit's western boundary and dominate the landscape visually. Eastern navigation keys off the Twin Peaks and Castle Rock summits, which rise as obvious reference points.

Monument Rocks and Chimney Rock serve as pillar markers for interior navigation. Spring knowledge is paramount—Rim Spring, Wiley Springs, and Big Spring are crucial water sources, while multiple ridge systems (Skinner, Horse, Henderson) offer glassing platforms. The Saddle gap provides a natural travel route across major ridgelines.

Bench features like Cedar Bench and Gasaway Bench create flat, accessible travel corridors.

Elevation & Habitat

Terrain spans from river canyon bottoms near 4,700 feet to forested ridges approaching 9,100 feet, creating distinct habitat layers. Lower elevations feature open sagebrush benches and pinyon-juniper woodland interspersed with ponderosa pine on north-facing slopes. Mid-elevation terrain supports mixed conifer stands and scattered aspen, particularly in cooler drainages.

Upper ridges and peaks transition to spruce-fir forest where moisture and elevation allow. The moderate forest coverage means glassable parks and meadows exist throughout, making visual hunting feasible across multiple zones. Exposure and aspect dramatically influence vegetation density and huntability.

Elevation Range (ft)?
4,7089,068
02,0004,0006,0008,00010,000
Median: 6,893 ft
Elevation Bands
8,000–9,500 ft
26%
6,500–8,000 ft
35%
5,000–6,500 ft
37%
Below 5,000 ft
2%

Access & Pressure

Five hundred thirty-four miles of roads provide fair distributed access, though the rolling terrain creates natural compartmentalization. No major highways cross the unit; access is primarily via secondary roads and county routes. Small towns like De Beque, Cameo, and Una serve as logical staging points.

Road density suggests moderate accessibility without excessive crowding—backcountry corners remain available to those willing to walk beyond easy road access. The unit's size and terrain complexity likely keep pressure distributed rather than concentrated. Early-season access may be limited by weather and road conditions.

Fair access requires understanding road networks; knowing which roads penetrate which drainages separates efficient hunters from those chasing dead ends.

Boundaries & Context

Unit 31 spans portions of Mesa, Garfield, and Rio Blanco counties, anchored by the Colorado River on the south and the White River divide marking the northern boundary. The eastern edge follows the Roan Creek and Parachute Creek divides, while the western margin traces the Bookcliffs and Salt Creek drainages. This is high-elevation plateau country—a mix of benches, ridges, and canyon systems that create natural compartments across the landscape.

The unit encompasses substantial acreage with rolling topography that appears deceptively simple until you're navigating its canyons and draws.

Land Cover Breakdown?
Mountains (forested)
18%
Mountains (open)
32%
Plains (forested)
17%
Plains (open)
34%
Water
0%

Water & Drainages

Water is the unit's limiting factor. Limited sources are scattered across the terrain, making pre-hunt research essential. Reliable water includes Rim Spring, East and West Wiley Springs, Big Spring, and several seasonal draws.

Major creeks—Carr Creek, Clear Creek, and Kimball Creek—flow through canyons but may dry seasonally. De Beque Reservoir and Pine Trail Reservoir offer water in lower portions but access is limited. Corcoran Wash and the numerous named draws provide additional possibilities.

The Colorado River borders the south, inaccessible to most hunters. Successful hunters scout spring locations and plan camps accordingly. Summer conditions likely see reduced flow, requiring early-season strategy adjustments.

Hunting Strategy

Unit 31 supports elk, mule deer, white-tailed deer, pronghorn, moose, bear, and mountain lion. Elk favor the higher timbered ridges and aspen parks, particularly in early season before rut migration to lower benches. Mule deer utilize benches and canyon breaks year-round.

White-tails concentrate in riparian corridors and dense juniper. Pronghorn work open sagebrush flats in the lower unit. Early season rewards ridge-top glassing of upper timbered country; rut season pushes elk lower into canyon systems and benches.

Spring knowledge becomes the primary factor in extended hunts—hunt water, not terrain alone. The unit's complexity rewards patience and thorough scouting. Multiple species availability means flexibility in targeting based on conditions encountered.