Sheep Mountain

Sheep Mountain covers 17,626 acres of mountainous, montane country on the Medicine Bow-Routt National Forest in Albany and Larimer counties, where Sheep Mountain itself rises as a long north-south ridge along the eastern flank of the Medicine Bow Mountains above the Centennial Valley. The terrain is structured by the ridge and by the gulches that cut into it — Moonshine Gulch and Chokecherry Gulch drop east toward the Little Laramie River system. The area sits at the headwaters of the South Fork Little Laramie River; Chokecherry Creek, Buckeye Creek, Lake Owen Creek, Hansen Creek, Johns Creek, Dale Creek, Hecht Creek, and Fence Creek descend off the ridge through aspen and conifer corridors. Hardigan Lake and Sundby Reservoir Number 2 hold water at higher elevations, supplying a hydrologically significant headwater complex.

Forest community types stack by elevation, aspect, and substrate. South-facing foothills hold Intermountain Mountain Sagebrush Steppe, Great Basin Big Sagebrush Steppe, and Wyoming Basin Dwarf Sagebrush, with antelope bitterbrush (Purshia tridentata), black sagebrush (Artemisia nova), and arrowleaf balsamroot (Balsamorhiza sagittata). Intermountain Mountain Mahogany Woodland forms tight stands on the rocky benches — the same mountain mahogany the area's indigenous name commemorates. Southern Rockies Ponderosa Pine Woodland and Savanna occupies warm mid-slopes, while Southern Rockies Mixed Conifer Forest and Rocky Mountain Lodgepole Pine Forest hold the cooler aspects, sheltering Saskatoon (Amelanchier alnifolia), creeping Oregon-grape (Berberis repens), and Canada buffaloberry (Shepherdia canadensis). Higher up, Rocky Mountain Dry Subalpine and Wet Subalpine Spruce-Fir Forest and Rocky Mountain Limber and Bristlecone Pine Woodland give way to Northern Rockies Subalpine Grassland and Rocky Mountain Subalpine Meadow. Rocky Mountain Aspen Forest pockets hold quaking aspen (Populus tremuloides) with sticky geranium (Geranium viscosissimum) and Wyoming Indian-paintbrush (Castilleja linariifolia) below. Streamside Rocky Mountain Subalpine and Foothill Streamside Woodland and Subalpine Streamside Shrubland carry the wet corridors, while Intermountain Greasewood Flat and Intermountain Semi-Desert Shrub-Steppe occupy the alkali transitions at the foot.

Wapiti (Cervus canadensis), mule deer (Odocoileus hemionus), pronghorn (Antilocapra americana), and moose (Alces alces) occupy distinct elevational zones, with white-tailed deer (Odocoileus virginianus) using the lower streamside corridors. Dusky grouse (Dendragapus obscurus) inhabits the conifer-aspen mosaic. Predators include cougar (Puma concolor), coyote (Canis latrans), American black bear (Ursus americanus), and American badger (Taxidea taxus). In the canopy, Williamson's sapsucker (Sphyrapicus thyroideus) and Lewis's woodpecker (Melanerpes lewis) work the conifer stands; Clark's nutcracker (Nucifraga columbiana) caches whitebark and limber pine seeds in the high stands. Calliope hummingbird (Selasphorus calliope) and broad-tailed hummingbird (Selasphorus platycercus) move between paintbrush meadows. American dipper hunts the cold creeks; American beaver (Castor canadensis) shapes side-channel habitat along Buckeye and Lake Owen Creeks. Wyoming ground squirrel (Urocitellus elegans) and yellow-bellied marmot (Marmota flaviventris) occupy the open meadows where golden eagle (Aquila chrysaetos) hunts overhead. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

A walk up Chokecherry Gulch climbs from sagebrush and mountain mahogany onto ponderosa benches and into Douglas-fir, then breaks into the spruce-fir at the crest of Sheep Mountain itself. The east face opens to the long sightline across the Little Laramie valley toward the Snowy Range. On the west, lodgepole forest closes back in.

The country around Sheep Mountain, where the Medicine Bow Range rises above the Centennial Valley west of Laramie, has been used by Indigenous peoples for thousands of years. For generations, Shoshone, Arapaho, Cheyenne, Ute, Lakota, and Crow people gathered plants, visited family, and tracked game along watercourses and over mountain passes [4]. The Cheyenne, Arapaho, Ute, and Lakota, among others, hunted in the Centennial area and made use of the abundant natural resources [3]. The origin of the name Medicine Bow derives from the American Indian tribes that inhabited southeastern Wyoming; they found mountain mahogany in one of the mountain valleys from which bows of exceptional quality were made, and it became the custom of friendly tribes to assemble there annually to construct their weapons, holding ceremonial powwows that early settlers came to call "making medicine" [5].

European-American activity reshaped the landscape in stages. The first Europeans, French fur traders, entered Wyoming as early as the 1740s, and French trader Jacque La Ramie explored the Laramie River system between 1820 and 1821 [3]. Cattle and homesteading came after the Pacific Railways Act and the Homestead Act of 1862. Land records show that homesteaders and ranchers were staking claims in the Centennial Valley as early as the late 1860s, including the Buckeye Ranch, possibly established as early as 1868 by Charles Bussard, and the Bow Fiddle Ranch, established in 1872 by James May [3]. Mining followed: gold was discovered in 1868 in what is now known as More's Gulch, where Douglas Creek flows into present-day Rob Roy Reservoir [3]. Placer gold was discovered in gravels along the Middle Fork of the Little Laramie River, leading to the organization of the Centennial Ridge mining district in the east-central Medicine Bow Mountains in 1876 [2]. The Centennial mine produced an estimated 4,500 ounces of gold [2]. A new wave of prospecting and development followed the 1901 discovery of platinum associated with copper ores at the New Rambler mine, which had first opened as a gold mine in 1870 and produced an estimated 171.3 ounces of gold, 7,346 ounces of silver, 1,753,924 pounds of copper, 910 ounces of platinum, and 16,870 ounces of palladium [2]. The town of Centennial was christened in 1876 in honor of the American Centennial [3]. Tie hacking supplied the Union Pacific: a railroad tie camp was established in the mountains near Centennial to supply ties to the Transcontinental Railroad, and the timber industry continued to be important even after mining declined [3].

Federal protection followed quickly. On May 22, 1902, President Theodore Roosevelt issued Proclamation 474 establishing the Medicine Bow Forest Reserve in the State of Wyoming [1]. The Medicine Bow Forest Reserve was established by President Theodore Roosevelt, and the Medicine Bow National Forest dates back to that May 22, 1902 establishment [5]. In 1929, the former Hayden National Forest along the Continental Divide was added [5]. In 1959, the area formerly used by the military was added to the Medicine Bow National Forest, and in 1961, all military interests in the Pole Mountain District were terminated [5]. Today, the 17,626-acre Sheep Mountain Inventoried Roadless Area sits within the Laramie Ranger District in Albany and Larimer counties, protected under the 2001 Roadless Area Conservation Rule.

Vital Resources Protected

• Headwater Protection for the South Fork Little Laramie River. The roadless condition of Sheep Mountain's 17,626 acres preserves the unsedimented headwaters of the South Fork Little Laramie River and its tributary network — Chokecherry, Buckeye, Lake Owen, Hansen, Johns, Dale, Hecht, and Fence creeks, plus Hardigan Lake and Sundby Reservoir Number 2. The area's hydrological significance is classified as major: stable gradients, intact streambank vegetation, and cold flow downstream depend on the absence of road-grade disturbance in the headwater catchments.

• Mountain Mahogany Woodland Integrity. Intermountain Mountain Mahogany Woodland — the community for which the range is named — occupies the rocky benches and forms tight, slow-growing stands important for browse and for cover for wintering wildlife. The roadless state preserves the unfragmented mahogany stands and the foothill shrubland mosaic of Rocky Mountain Foothill Shrubland and Wyoming Basin Dwarf Sagebrush around them, which together carry mule deer and elk between the sage flats and the higher conifer.

• Elevational Gradient Connectivity. The area's continuous ecological staircase — sagebrush steppe and mountain mahogany at the foot, Southern Rockies Ponderosa Pine Woodland and Mixed Conifer Forest mid-slope, Rocky Mountain Lodgepole Pine Forest above that, and Rocky Mountain Dry and Wet Subalpine Spruce-Fir Forest with Limber and Bristlecone Pine Woodland on the ridge — gives elk, mule deer, moose, cougar, and Canada lynx the seasonal movement corridors that span over 2,000 feet of elevation. Roadless conditions keep encounter rates low and movement uninterrupted.

Potential Effects of Road Construction

• Sedimentation of the Little Laramie Headwaters. Road construction across the slopes draining into Chokecherry, Buckeye, Lake Owen, and the other named creeks would deliver chronic fine sediment from cut banks and ditch lines to the streambed, smothering spawning gravels and depressing aquatic invertebrate density. Because soils in Southern Rockies Mixed Conifer Forest and Rocky Mountain Lodgepole Pine Forest are shallow and erodible once the litter layer is broken, sediment delivery persists for decades, and culverted crossings further sever fish passage and concentrate erosive flow downstream into the South Fork Little Laramie River.

• Fragmentation of Mountain Mahogany and Sagebrush Mosaic. Mountain mahogany regenerates slowly and is intolerant of repeated mechanical disturbance; a road grade through Intermountain Mountain Mahogany Woodland breaks stand structure that takes decades to rebuild. The same corridor invites cheatgrass and other invasive annual grasses into Great Basin Big Sagebrush Steppe and Wyoming Basin Dwarf Sagebrush, where, once established, they restructure the fire regime to the point where native sagebrush cannot persist — a conversion that is difficult to reverse on a management timescale.

• Carnivore Mortality and Habitat Fragmentation. Roads function as both physical barriers and behavioral filters: increased human access raises mortality risk for cougar, Canada lynx, and American black bear, and even unpaved corridors disrupt the seasonal movements between sage, conifer, and subalpine habitats that wide-ranging carnivores depend on. White pine blister rust, a documented threat to the Rocky Mountain Limber and Bristlecone Pine Woodland on the ridge, also moves more readily along disturbed corridors — meaning a road grade not only fragments carnivore habitat but accelerates the loss of the high-elevation pine stands themselves.

Sheep Mountain spans 17,626 acres of mountainous, montane country on the Laramie Ranger District of the Medicine Bow-Routt National Forest. The trail system is short and direct, with no developed trailheads or campgrounds inside the area — access is walk-in and stock-supported from the surrounding forest road network.

The Sheep Mountain Trail (386) is the central route at 11.7 miles, running the length of the long north-south ridge for which the area is named. Two designated access routes connect to it: the Sheep Mt North Access (386-B) at 3.5 miles and the Sheep Mountain South Access (386-A) at 1.9 miles. The Fence Creek Trail (385) adds 3.7 miles into the eastern drainage. All four are native-material surfaces designated for horse use. Together, they offer roughly twenty miles of trail along and across the ridge, providing through-route options for stock-supported and walk-in users.

Hunting is a primary use. Wapiti (Cervus canadensis), mule deer (Odocoileus hemionus), white-tailed deer (Odocoileus virginianus), pronghorn (Antilocapra americana), and moose (Alces alces) occupy distinct elevational zones across the sagebrush steppe, mountain mahogany woodland, ponderosa pine, lodgepole and mixed conifer, and subalpine meadows. Dusky grouse (Dendragapus obscurus) inhabits the conifer-aspen mosaic. Predators present include cougar (Puma concolor), coyote (Canis latrans), American black bear (Ursus americanus), and American badger (Taxidea taxus). The native-surface trail system allows walk-in and horse-supported hunting along the ridge and into the gulches.

Cold-water fishing is available in the South Fork Little Laramie River headwaters and its tributaries — Chokecherry Creek, Buckeye Creek, Lake Owen Creek, Hansen Creek, Johns Creek, Dale Creek, Hecht Creek, and Fence Creek — along with Hardigan Lake and Sundby Reservoir Number 2 at higher elevations. Brook trout (Salvelinus fontinalis), tiger trout (Salmo trutta × Salvelinus fontinalis), and yellow perch (Perca flavescens) are documented in the area's waters. The hydrologically significant headwater complex sustains the fishery.

Birding is extensive: 17 eBird hotspots are recorded within 24 km of the area, the most active being Laramie Plains Lakes–Blake's Pond at 183 species across 1,165 checklists, Laramie Plains Lakes–Lake Hattie Reservoir at 178 species, and Laramie Plains Lakes–Meeboer Lake at 160 species. The Medicine Bow NF Little Laramie Trail System and Centennial Snowy Range Visitor Center hotspots provide closer-in access. The trail system across Sheep Mountain itself carries birders from sagebrush flats — where green-tailed towhee (Pipilo chlorurus), rock wren (Salpinctes obsoletus), and Brewer's blackbird (Euphagus cyanocephalus) work the shrub — into ponderosa and mixed conifer holding Townsend's solitaire (Myadestes townsendi), western tanager (Piranga ludoviciana), red-naped sapsucker (Sphyrapicus nuchalis), and mountain chickadee (Poecile gambeli). At the high ridge, Clark's nutcracker (Nucifraga columbiana) and gray-crowned rosy-finch (Leucosticte tephrocotis) hold the limber pine and subalpine grassland. Golden eagle and bald eagle work the air column.

Wildlife photography of moose along the willow-lined creek bottoms, elk in the high meadows, and sandhill crane (Antigone canadensis) in the wet swales is a documented use. Dispersed backcountry camping is permitted; the absence of designated campgrounds means visitors carry water and pack out everything they bring in. Every documented use of Sheep Mountain — the long horse traverse along the ridge, the cold-water fishing in the headwaters, the bird transects from sage to limber pine, the walk-in hunting from the access trails — depends on the unroaded character of the country between the perimeter and the spine of the ridge.