Unit 691
CUSTER/FREMONT
Rolling mountain terrain spanning the Arkansas River drainage with dense timber and limited water sources.
Hunter's Brief
GMU 691 covers rolling country between the Arkansas River's north and south branches in Custer and Fremont counties. The landscape transitions from lower riparian valleys around 5,300 feet to forested ridges near 8,600 feet, with dense conifer stands dominating the mid-elevations. Fair road access via Colorado 69 and Forest Service routes provides reasonable entry points, though water becomes scarce away from the main drainages. Expect moderate hunting pressure with terrain complex enough to offer solitude beyond the primary access corridors.
- 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
Terrain Deep Dive
Landmarks & Navigation
Fremont Peak and Baldy Mountain anchor the highest terrain and serve as excellent glassing points for scanning lower country. Gorge Hills, Y M C A Mountain, and Red Mountain provide mid-elevation reference features. The Tights and Copper Gulch Divide mark key terrain transitions where hunters can move between major drainages.
Indian Springs and Deadhorse Spring are notable water sources worth noting, though seasonal reliability varies. Several named parks—Goat Park, Eightmile Park, Cody Park—offer open glassing terrain within the forest matrix. These features help orient hunters on rolling country where contour lines can blur together.
Elevation & Habitat
Elevation spans from 5,300 feet in valley bottoms to 8,600 feet on the higher ridges, with the bulk of the unit concentrated in the 6,500–8,000 foot band. Lower elevations feature sagebrush parks and piñon-juniper transitions along the Arkansas River corridor. As elevation increases, Douglas fir and ponderosa pine dominate, giving way to denser spruce-fir stands on the cooler north-facing slopes.
The unit's rolling topography creates numerous benches and park areas—Sheep Basin, South Webster Park, and Indian Springs Park among them—that break the timber into huntable patches. This mixed forest-and-park composition supports both elk and mule deer at different elevations.
Access & Pressure
Nearly 280 miles of roads provide fair connectivity, though exact road density figures are unclear from the data. Main access follows Colorado 69 from the west and U.S. 50 from the north, with Forest Service roads branching into the interior. The rolling terrain and moderate size means pressure stays manageable but noticeable during opener and peak hunting windows.
Most hunters concentrate along the primary drainages and accessible parks. The terrain's rolling, timbered character allows hunters willing to distance themselves from roads to find less-pressured country, particularly on mid-elevation slopes between major access corridors.
Boundaries & Context
The unit occupies the drainage country between the Arkansas River's main stem and its tributaries, bounded by U.S. 50 on the north and Colorado 69 on the west. The Arkansas and Grape Creek form the eastern and southern boundaries, creating a well-defined block of roughly 150 square miles in south-central Colorado. Sample, Buckskin Joe, and Hillside communities sit at the periphery, providing reference points for access and resupply.
The geography creates natural compartments along major drainages—Sand Creek, Swift Creek, and Taylor Creek being the primary travel corridors through rolling terrain.
Water & Drainages
The Arkansas River forms the unit's northern and eastern boundary with reliable flow, but interior water is limited and seasonal. Sand Creek, Swift Creek, and Taylor Creek are the primary drainages and carry water during spring runoff and early summer, though flow diminishes by mid-late season. Springs including Indian Springs, Mow Spring, and Falling Rock Spring exist but shouldn't be relied on without local knowledge.
Hunters must plan water strategy carefully, particularly for mid-elevation camping. The limited water sources concentrate both hunters and animals along the main drainages, especially in late season.
Hunting Strategy
Elk favor the higher forested slopes and open parks at 7,500–8,500 feet, particularly around Sheep Basin and the upper drainages. Mule deer use the park-and-timber mix throughout but concentrate lower along Sand Creek and Swift Creek bottoms. White-tailed deer favor riparian areas and dense cover near the Arkansas River.
Early season hunts key on high-elevation parks and ridge glassing; transition to drainages as animals move. Pronghorn use the lower sagebrush valleys. Moose, though listed as present, are uncommon.
The rolling terrain rewards hunters who glass parks from ridge vantage points then move to drainages during mid-day or for evening approaches. Water scarcity makes staying near creeks logical even though crowds concentrate there.