Wilderness Study Area

The Wilderness Study Area encompasses 51,961 acres of subalpine terrain in the Snake River Range of Targhee National Forest, Wyoming. Observation Peak (9,960 ft), Deadhorse Peak (9,770 ft), Indian Peak (9,683 ft), and Starvation Peak (9,642 ft) define the high country, with Deadhorse Canyon cutting through the landscape below. Water originates across these ridgelines and drains through multiple named drainages: Siddoway Fork and Big Elk Creek form the primary headwaters in the northern portion, while South Fork Indian Creek and North Fork Indian Creek drain the central peaks. Mosquito Creek, Trail Creek, and additional tributaries carry snowmelt and seasonal runoff through the area, creating a hydrologically active landscape where water movement shapes both forest composition and wildlife habitat.

The area's forest communities reflect elevation and moisture gradients across the subalpine zone. At higher elevations and on exposed ridges, Whitebark Pine / Subalpine Fir Forest dominates, with whitebark pine (Pinus albicaulis), the federally threatened whitebark pine, and subalpine fir (Abies lasiocarpa) forming an open canopy. In moister coves and north-facing slopes, Engelmann Spruce / Subalpine Fir Forest creates denser stands where Engelmann spruce (Picea engelmannii) and subalpine fir reach greater heights. Lower elevations and drier aspects support Lodgepole Pine / Geyer's Sedge Plant Community, where lodgepole pine (Pinus contorta) creates even-aged stands with Geyer's sedge (Carex geyeri) carpeting the understory. Quaking Aspen / Tall Forb Community occupies disturbed areas and riparian margins, with quaking aspen (Populus tremuloides) providing early successional cover. Subalpine Herbaceous Meadows and the Subalpine Fir / Ross' Sedge Habitat Type occur in wet meadows and seepage areas, where Ross' sedge (Carex rossii) and the federally threatened Ute ladies'-tresses (Spiranthes diluvialis) grow among mountain bluebells (Mertensia ciliata), arrowleaf balsamroot (Balsamorhiza sagittata), sticky geranium (Geranium viscosissimum), and snowbrush ceanothus (Ceanothus velutinus).

Large carnivores structure the food web across this landscape. The federally threatened grizzly bear (Ursus arctos horribilis) and the federally threatened North American wolverine (Gulo gulo luscus) occupy the highest trophic level, with grizzlies foraging on ungulates and seasonal plant foods while wolverines hunt across vast territories. The federally threatened Canada lynx (Lynx canadensis) preys on snowshoe hares in the dense spruce-fir forests. Gray wolf (Canis lupus) hunts elk (Wapiti) (Cervus canadensis) and mule deer (Odocoileus hemionus), which migrate seasonally through the area. Moose (Alces alces) browse willows and aquatic vegetation in riparian zones and wet meadows. In the creek systems, Rocky Mountain cutthroat trout (Oncorhynchus virginalis) occupy cold-water reaches, while American beaver (Castor canadensis) engineer wetland habitat that supports waterfowl. Bald eagle (Haliaeetus leucocephalus) and the federally threatened yellow-billed cuckoo (Coccyzus americanus) hunt across the canopy and mid-story. The proposed endangered Suckley's cuckoo bumble bee (Bombus suckleyi) and the proposed threatened monarch butterfly (Danaus plexippus) pollinate the subalpine forbs, while peregrine falcon (Falco peregrinus) hunts birds from cliff perches.

A visitor following Trail Creek upslope from the lower drainages enters lodgepole forest where the understory opens to sedge meadows, the air cool and the light filtered through the dense canopy. As elevation increases and the trail steepens, the forest transitions to Engelmann spruce and subalpine fir, the trees taller and closer together, the understory darker and composed primarily of moss and fallen needles. Breaking above treeline onto the ridges—Observation Peak or Deadhorse Peak—the landscape opens dramatically. Whitebark pine and subalpine fir thin to scattered individuals, and the ground becomes a mosaic of low herbaceous meadow and exposed rock. On the descent into Deadhorse Canyon or toward the Indian Creek drainages, quaking aspen groves appear on south-facing slopes, their leaves trembling in the wind, while wet meadows along the creek bottoms display the full diversity of subalpine forbs. The sound of water is constant in the drainages; the silence on the high ridges is equally complete.

The Shoshone and Bannock peoples historically inhabited this region of Wyoming for thousands of years. The Eastern Shoshone occupied western Wyoming and the Wind River Mountains for at least 3,500 years. The Bannock, after whom the Targhee National Forest is named, practiced a semi-nomadic lifestyle, moving from winter villages along the upper Snake River into the mountains during spring and summer to follow blooming vegetation and ripening plants. They hunted mountain sheep, elk, deer, and moose, gathered native plants and roots including camas bulbs and huckleberries, and fished for cutthroat trout and salmon in the region's streams. The Nez Perce (Nimíipuu) and Northern Paiute also historically traveled through and utilized this region for hunting, fishing, and trade. Today, the Shoshone-Bannock Tribes retain treaty rights to hunt and fish on unoccupied lands outside of their reservation, and the area remains part of their living history.

European-American contact intensified in the early nineteenth century. Between 1810 and 1840, the adjacent Teton Basin served as a major site for fur trapper rendezvous where Indigenous peoples gathered to trade with European-American mountain men. In 1863, a party of 26 prospectors led by Walter W. DeLacy explored the south branch of the Snake River near this area, providing some of the first cartographic records of the region, though they failed to find significant gold deposits. In the 1870s, several hundred miners, including a significant population of Chinese immigrants, conducted placer gold mining along the Snake River Canyon, working claims for "flour gold" on river bars and rocky slopes. Historical coal mining occurred in the broader region to support local infrastructure, such as the Reclamation Service's mines on Lava Creek and Pilgrim Creek used for Jackson Lake Dam construction.

On July 1, 1908, President Theodore Roosevelt established the Targhee National Forest through executive action. The forest was formed from lands previously part of the Yellowstone, Henry's Lake, and Beaverhead Forest Reserves. On July 1, 1910, the southern portion of the Targhee National Forest was split off to create the Palisade National Forest. The Targhee National Forest subsequently underwent administrative reorganization: in 1993, the Idaho Land Exchange Act authorized boundary adjustments to facilitate land exchanges with the State of Idaho; in 2000, the Targhee National Forest was administratively merged with the Caribou National Forest to form the Caribou-Targhee National Forest.

The Wyoming Wilderness Act of 1984 (Public Law 98-550) formally designated the Palisades Wilderness Study Area. The area has a history of timber harvesting, though logging within this specific 51,961-acre boundary has been restricted to protect its wilderness character. While the Caribou-Targhee National Forest is a major source of phosphate in the United States, these operations are concentrated in the Idaho section rather than the Wyoming section of the forest. On January 12, 2001, the Roadless Area Conservation Rule extended federal protection to this 51,961-acre Inventoried Roadless Area. The Wyoming Timber Industry Association's 1999 lawsuit challenging the federal road-building moratorium proved pivotal in the legal history of the Roadless Rule and its application to areas such as the Palisades Wilderness Study Area.

Vital Resources Protected

Headwater Protection for Legendary Downstream Fisheries

This 51,961-acre subalpine block contains the headwaters of Siddoway Fork, Big Elk Creek, and the South Fork Indian Creek—tributaries that feed the Henrys Fork and South Fork of the Snake River, systems of legendary conservation significance. The roadless condition preserves the intact riparian buffers and unfragmented forest canopy that regulate water temperature, filter sediment, and maintain the hydrological stability these downstream fisheries depend on. Yellowstone cutthroat trout and Bonneville cutthroat trout populations in these drainages are already threatened by habitat degradation and sediment buildup; the headwater forests in this area function as the last refugium where spawning substrate remains uncompromised and water quality is maintained by undisturbed soil and vegetation.

Whitebark Pine Ecosystem Integrity in a Climate-Vulnerable Landscape

The Whitebark Pine / Subalpine Fir forests within this area represent a threatened ecosystem already under siege from blister rust and climate-driven beetle outbreaks. Whitebark pine (federally threatened) depends on the structural complexity and microhabitat diversity that develops only in unfragmented, mature subalpine forests. Road construction would fragment these stands, increase edge exposure to pest pressure and desiccation, and eliminate the cool, moist microsites where whitebark pine regeneration occurs. Once fragmented, these high-elevation forests cannot recover their ecological function within any meaningful restoration timeframe—the species composition and structural diversity that took centuries to develop would be permanently altered.

Climate Refugia Connectivity for Threatened Carnivores

The continuous subalpine and high-elevation terrain across this roadless area—from Observation Peak (9,960 ft) through Deadhorse Peak and the Snake River Range—functions as climate refugia and movement corridor for Canada lynx (federally threatened), grizzly bear (federally threatened), and North American wolverine (federally threatened). These species require large, unfragmented territories with secure habitat where they can shift their ranges in response to changing climate conditions. The roadless condition preserves the elevational gradient and interior forest habitat that allows these carnivores to move between thermal refugia without encountering human infrastructure. Road construction would sever this connectivity, isolating populations in smaller patches where climate-driven range shifts become impossible and human-caused mortality increases.

Subalpine Meadow and Wetland-Upland Transition Zones

The Subalpine Herbaceous Meadows, Subalpine Fir / Ross' Sedge Habitat Type, and Lodgepole Pine / Geyer's Sedge Plant Communities within this area maintain hydrological function and provide specialized habitat for species dependent on wet-meadow and transition-zone conditions. Ute ladies'-tresses (federally threatened) and white bog orchid (vulnerable, IUCN) are rooted in these sedge-dominated wetlands, which depend on intact water tables and undisturbed soil structure. Road construction and associated fill would disrupt groundwater flow, alter snowmelt timing, and fragment the wetland-upland mosaic that these species require. The loss of these transition zones would be particularly severe because subalpine wetlands develop over centuries and cannot be recreated once their hydrological foundation is compromised.

Threats from Road Construction

Sedimentation and Stream Temperature Increase in Headwater Drainages

Road construction on subalpine slopes generates chronic erosion from cut banks and disturbed fill, delivering sediment directly into the headwater network of Siddoway Fork, Big Elk Creek, and South Fork Indian Creek. Removal of riparian forest canopy along road corridors eliminates shade, causing stream temperatures to rise—a direct threat to Yellowstone cutthroat trout and Bonneville cutthroat trout, which require cold water for spawning and juvenile survival. The Watershed Condition Framework assessments already identify sediment buildup as a primary monitoring concern in this region; road construction would accelerate this degradation precisely in the headwater reaches where these fish populations are most vulnerable and where restoration is most difficult. Once sediment fills spawning gravels and water temperatures exceed thermal tolerance, the reproductive capacity of these populations collapses.

Habitat Fragmentation and Edge-Effect Impacts on Threatened Carnivores

Road construction fragments the continuous interior forest habitat that Canada lynx, grizzly bear, and North American wolverine require for secure movement and denning. The linear disturbance of a road corridor creates edge habitat where these species face increased visibility to humans, vehicle strikes, and poaching pressure. For lynx, which depend on dense, unfragmented forest for hunting snowshoe hares, road corridors reduce prey availability and increase predation risk. For grizzly bears, roads facilitate human access into previously secure habitat, increasing the probability of human-bear conflicts and bear mortality—a documented threat already identified in conservation assessments of this area. The subalpine terrain's limited extent means that fragmentation here is irreversible; once the continuous forest is severed, these carnivores cannot recolonize the isolated patches, and the population connectivity that allows range shifts in response to climate change is permanently lost.

Canopy Removal and Microhabitat Loss in Whitebark Pine Stands

Road construction requires removal of mature subalpine forest, including the whitebark pine and Engelmann spruce canopy that creates the cool, moist microsites essential for whitebark pine regeneration and survival. The loss of overstory shade increases solar radiation and evaporative stress on seedlings already weakened by blister rust and beetle pressure. Road-associated disturbance also creates conditions favoring invasive grasses, which establish in disturbed soil and create heavy, continuous fuel that increases wildfire frequency and intensity—a documented threat in USFS assessments of this region. Whitebark pine forests cannot recover from this combination of direct removal and indirect edge effects; the structural complexity and species composition that took centuries to develop would be replaced by simplified, fire-prone vegetation dominated by lodgepole pine and invasive species.

Hydrological Disruption of Subalpine Wetlands and Sedge Meadows

Road construction across subalpine wetlands and the Subalpine Fir / Ross' Sedge and Lodgepole Pine / Geyer's Sedge plant communities requires fill material and drainage infrastructure that disrupts groundwater flow and alters snowmelt timing. These changes directly compromise the water table that sustains Ute ladies'-tresses and white bog orchid, which depend on consistent soil moisture and specific hydrological regimes. Culverts and drainage structures fragment the wetland-upland transition zones, isolating the specialized plant communities that have developed in these microsites over centuries. Unlike forested ecosystems, subalpine wetlands cannot shift their location or recover their hydrological function once the water table is disrupted; the loss of these communities would be permanent and irreversible.

The Targhee National Forest Wilderness Study Area encompasses 51,961 acres of subalpine terrain in the Snake River Range, with elevations from 5,600 to 9,960 feet at Observation Peak. The area's roadless condition supports a network of over 40 maintained trails on native material surfaces, providing access to high-country recreation that depends entirely on the absence of motorized development.

Hiking and Horseback Riding

The study area contains extensive trail systems suitable for both foot and stock travel. The DIVIDE TRAIL (4050) and DIVIDE (4056) offer long-distance routes of 20–21.6 miles through the high country. Shorter day hikes include the OBSERVATION PEAK trail (1.2 miles), STARVATION PEAK (3.3 miles), and INDIAN PEAK (0.8 miles), all providing access to named summits. The SHEEP DRIVEWAY (4051) spans 15.8 miles and connects multiple drainages. Access points include the SOUTH INDIAN CREEK TRAILHEAD, TETON PASS TRAILHEAD, and COAL CREEK. Trail Creek Campground and Alpine Campground & Group Area provide base camps for extended trips. Horses are permitted on most trails; dispersed horse camping is available near Palisades Reservoir. The roadless character of these trails—free from motorized use and road noise—defines the backcountry experience here.

Mountain Biking

Mountain bike use concentrates on three primary trails: LITHIUM (4004B, 3.5 miles), BLACK CANYON (4004, 6.3 miles), and MAIL CABIN (6044, 3.4 miles). Secondary routes include CABIN CREEK (4062, 4.0 miles), MOSQUITO CREEK (4005, 3.8 miles), SOUTH FORK FALL CREEK (4009, 9.0 miles), and HAPPY HOUR (6401, 4.1 miles). These trails total approximately 13 miles of concentrated use and offer riders access to subalpine forest and meadow terrain without encountering motorized traffic—a condition that would be lost if roads were constructed into the area.

Hunting

The study area supports hunting for elk, mule deer, and Rocky Mountain bighorn sheep within Wyoming Game and Fish Department Hunt Areas 6, 144, 146, 149, 150, 151, 152, 155, and 156. Dusky grouse and ruffed grouse seasons run September through December. The terrain is documented as remote and rugged, requiring backcountry access via trail. Nonresidents hunting big game must be accompanied by a licensed guide or a resident companion. Hunters must use certified weed-free hay for pack stock and carry bear spray in this active grizzly bear habitat. Winter range closures begin in December. The roadless condition preserves the remote character essential to this hunt experience and protects critical winter range from fragmentation.

Fishing

Big Elk Creek, an 11.2-mile freestone stream, supports Yellowstone cutthroat trout and serves as spawning habitat for kokanee salmon migrating from Palisades Reservoir in late summer and fall. Trail Creek near Teton Pass also supports trout. The Snake River, which borders the study area, contains the native Snake River fine-spotted cutthroat trout. Wyoming fishing regulations for Area 1 set a daily creel limit of three trout per day, with no more than one exceeding 16 inches. In Palisades Reservoir tributaries including Big Elk Creek, kokanee salmon harvest is prohibited and cutthroat trout are catch-and-release only. Live baitfish is prohibited; only dead bait from native species or commercially preserved bait is allowed. Access to Big Elk Creek is available via the Big Elk Creek Trail (4097, 10.3 miles) and by boat to the lower reaches from Palisades Reservoir. The undisturbed watershed condition of these cold headwater streams—maintained by the absence of roads and associated erosion—is critical to native trout populations and spawning habitat.

Photography and Wildlife Observation

Observation Peak (9,960 feet) provides expansive views across the wilderness and Snake River Canyon. Ferry Peak (9,600 feet) offers panoramic vistas of the Snake River Range and river valley. Big Elk Creek passes through scenic meadows with wildflower displays in summer months. The area supports wildlife photography opportunities for grizzly bears, black bears, moose, elk, and mule deer, as well as bald eagles, ospreys, and grouse species. The study area lies within a proposed 20-million-acre dark sky reserve in the Greater Yellowstone Ecosystem, offering some of the darkest night skies in the United States. The roadless condition preserves both the visual integrity of these landscapes and the undisturbed habitat that supports the wildlife these photographers seek.