Walker Prairie

Walker Prairie encompasses 62,434 acres of subalpine terrain on the Bighorn National Forest in Wyoming, spanning elevations from 7,068 feet at Walker Prairie itself to 9,489 feet at Black Mountain. The area drains into the West Fork Big Goose Creek watershed, with Wolf Creek, Walker Creek, and Big Goose Creek forming the primary hydrologic network. These streams originate in the high country around Herdrick Ridge and Big Mountain, flowing through Bear Gulch and Red Canyon before joining the larger drainage system. Water moves through this landscape as both surface flow in named creeks and subsurface seepage through meadows and riparian zones, creating distinct zones of moisture-dependent vegetation.

The forest composition shifts with elevation and moisture availability. At higher elevations and on north-facing slopes, Subalpine Fir and Engelmann Spruce Forest dominates, with grouse whortleberry (Vaccinium scoparium) forming a dense understory layer. Lodgepole Pine Forest occupies drier sites and areas recovering from past disturbance, often with Idaho fescue (Festuca idahoensis) in the understory. Quaking Aspen Forest occurs in patches where moisture and aspect favor deciduous growth, while lower elevations support Mountain Big Sagebrush Steppe with Idaho fescue and bluebunch wheatgrass. Riparian corridors along the creeks are characterized by Willow-dominated Riparian Shrubland, with mountain ninebark (Physocarpus monogynus) and shrubby cinquefoil (Dasiphora fruticosa) in the shrub layer. Meadow areas support specialized plant communities including mountain lady's-slipper (Cypripedium montanum), vulnerable (IUCN), and white bog orchid (Platanthera dilatata), vulnerable (IUCN), which depend on consistent moisture and specific soil conditions.

Large herbivores structure the landscape through browsing and grazing. Moose inhabit the riparian willow zones and wet meadows, while mule deer and wapiti (Cervus canadensis) move across multiple community types from sagebrush steppe to high forest. American black bears forage in berry-rich understories and meadows. Dusky grouse (Dendragapus obscurus) occupy the coniferous forest canopy and understory, while Canada jay (Perisoreus canadensis) and hermit thrush (Catharus guttatus) are year-round residents of the spruce-fir forest. Rocky Mountain cutthroat trout (Oncorhynchus virginalis) inhabit the cold headwater streams. Suckley's cuckoo bumble bee (Bombus suckleyi), proposed for federal endangered status, and monarch butterfly (Danaus plexippus), proposed for federal threatened status, depend on flowering plants in meadows and open areas. The soft aster (Symphyotrichum molle), vulnerable (IUCN), provides late-season forage for these pollinators.

A visitor moving through Walker Prairie experiences distinct ecological transitions. Starting in the sagebrush steppe near Walker Prairie itself, with arrowleaf balsamroot (Balsamorhiza sagittata) and sticky geranium (Geranium viscosissimum) blooming in early summer, the landscape shifts upslope into lodgepole pine forest where the understory darkens and the sound of wind in the canopy replaces the open-country silence. Following Wolf Creek or Walker Creek northward, the forest transitions to spruce-fir as moisture increases and elevation rises, the understory becoming a thick mat of grouse whortleberry. Near the creeks themselves, willow thickets open the canopy and the sound of running water becomes constant. Climbing toward Herdrick Ridge or Big Mountain, the forest becomes increasingly dense and the understory sparser, with only the hardiest plants persisting in the thin soil and short growing season of the highest elevations.

The Bighorn Mountains, including the area now designated as Walker Prairie, held profound significance for the Indigenous peoples of the Rocky Mountain region. The Eastern Shoshone historically used these mountains for hunting and transit. The 1851 Treaty of Fort Laramie recognized the Bighorn Mountains as Crow territory, and Crow Chief Arapooish described the region in the 1830s as vital summer hunting grounds for elk, deer, and bighorn sheep. The Northern Arapaho migrated into the region and used the Bighorn Mountains for hunting and seasonal subsistence, often in alliance with the Cheyenne. The Lakota (Sioux) expanded into the Bighorn region in the mid-19th century, contesting territory with the Crow and Shoshone for access to prime hunting grounds. Multiple tribes followed a seasonal cycle, moving into the high mountain pastures during summer months and relying on the area as a critical resource for large-game hunting. The Bighorn Mountains are crisscrossed by ancient trails marked by stone cairns, evidence of long-established travel and trade routes. Archaeological evidence in the region includes lithic scatters, wickiup remains, and projectile points dating back to the Paleo-Indian period more than 8,500 years ago. The Bighorn Medicine Wheel, located on nearby Medicine Mountain, is a sacred site used by at least sixteen different tribes for ceremonies, vision quests, and prayer.

The mid-nineteenth century brought increased conflict over these hunting territories. The Great Sioux War of 1876 made the Bighorn Mountains and surrounding foothills a central theater of conflict. As Euro-American settlement and industrial development advanced into the region, Indigenous use of the landscape became increasingly constrained.

Beginning in the 1860s, the eastern slopes of the Bighorn Mountains became a primary site for the "tie hack" industry, in which workers harvested timber for railroad ties. Although no major transcontinental rail lines crossed directly through this area, the region served as a critical source of ties that built the Union Pacific and other regional railroad lines. The mountains also attracted prospectors: an estimated 3,000 prospectors worked streams in the range during the late nineteenth century. While small-scale gold and silver mining occurred, most commercial operations were short-lived due to low ore grades, and no major industrial mining centers were established within the Walker Prairie vicinity. Livestock grazing emerged as a dominant land use in the high-elevation prairies.

On February 22, 1897, President Grover Cleveland issued a presidential proclamation establishing the Big Horn Forest Reserve under the authority of Section 24 of the Act of March 3, 1891, commonly known as the Forest Reserve Act. The original reserve encompassed approximately 1,198,080 acres. On March 4, 1907, Congress formally changed the designation from "Forest Reserve" to "National Forest," and the Bighorn National Forest became one of the earliest federal forest reserves in the United States. Since its establishment, livestock grazing (sheep and cattle) has remained a regulated land use in the high-elevation prairies like Walker Prairie. Between 1938 and 1940, the Civilian Conservation Corps was active in the Bighorn National Forest, building many of the early roads, bridges, and trails that define the boundaries of the current roadless area.

On January 12, 2001, the Roadless Area Conservation Rule designated 62,434 acres within the Bighorn National Forest as the Walker Prairie Inventoried Roadless Area. The State of Wyoming was a lead plaintiff in legal challenges to this rule, contesting the federal protection of roadless lands.

Vital Resources Protected

Headwater Protection and Cold-Water Fishery Connectivity

The Walker Prairie area encompasses the headwaters of West Fork Big Goose Creek and Wolf Creek, originating in the subalpine zone above 7,000 feet where snowmelt sustains year-round streamflow. The roadless condition preserves the intact riparian buffer—the band of vegetation along these streams—which stabilizes stream banks, filters sediment before it reaches water, and maintains cool temperatures critical for native fish populations. Once roads fragment this landscape, chronic erosion from cut slopes and loss of streamside forest canopy would warm these headwaters, making them unsuitable for cold-water species that depend on stable, cool conditions throughout their life cycles.

Willow and Aspen Riparian Habitat for Ungulates and Migratory Birds

The area's willow-dominated riparian shrubland and quaking aspen forest are being encroached upon by conifers—a documented threat accelerated by fire exclusion. The roadless status allows these moisture-dependent communities to persist without the soil disturbance that would favor invasive species like cheatgrass and accelerate conifer invasion. Approximately 61% of Wyoming's terrestrial vertebrate species depend on riparian habitats, which comprise only 1% of the landscape; the Northern Goshawk and migratory songbirds rely on these aspen and willow stands. Road construction would fragment these already scarce habitats and create disturbed corridors where invasive species establish, further degrading the forage and nesting habitat that mule deer—currently in steep decline across Wyoming—require for survival.

Subalpine Elevational Gradient and Climate Refugia Connectivity

The area spans from Walker Prairie at 7,068 feet to Black Mountain at 9,489 feet, creating an elevational gradient that allows species to shift their ranges as climate conditions change. This vertical connectivity is essential as temperatures rise and moisture-dependent species like mountain lady's-slipper (Cypripedium montanum, vulnerable) and white bog orchid (Platanthera dilatata, vulnerable) must migrate upslope to find suitable conditions. Road construction would disrupt this gradient by fragmenting forest connectivity and creating edge effects—zones of altered microclimate and increased invasive species establishment—that compress the available climate space for species already stressed by warming.

Pollinator Habitat for Suckley's Cuckoo Bumble Bee and Monarch Butterfly

The diverse meadow and forest-edge ecosystems support the proposed endangered Suckley's cuckoo bumble bee (Bombus suckleyi) and proposed threatened monarch butterfly (Danaus plexippus), both of which depend on continuous flowering plants across the landscape. The roadless condition maintains the structural complexity of the subalpine fir/Engelmann spruce forest interspersed with grassland—a mosaic that provides nectar sources throughout the growing season. Road construction would fragment this mosaic into isolated patches too small to sustain viable populations, and the disturbed roadsides would be colonized by invasive species that do not provide adequate forage for these specialized pollinators.

Threats from Road Construction

Sedimentation and Stream Temperature Increase from Canopy Removal and Cut Slopes

Road construction in mountainous terrain requires cutting into slopes to create stable roadbeds, exposing bare soil that erodes with every rainstorm and snowmelt event. In the Walker Prairie headwaters, this chronic sedimentation would degrade spawning substrate—the clean gravel where native fish lay eggs—and increase water turbidity, reducing light penetration that aquatic plants need for photosynthesis. Simultaneously, removing the forest canopy along stream corridors to accommodate roads would eliminate shade, allowing solar radiation to warm the water; even small temperature increases in already cool headwater streams can exceed the thermal tolerance of cold-water fish species and trigger population collapse in streams where temperatures are already near critical thresholds.

Habitat Fragmentation and Edge Effects on Mule Deer Migration Corridors

The Walker Prairie IRA is recognized as a stronghold for mule deer, a species that has declined from 500,000 to 200,000 individuals across Wyoming since 2000, largely due to habitat fragmentation. Road construction would bisect the area's interior forest, creating barriers to movement and dividing populations into smaller, isolated groups vulnerable to local extinction. The edges created by roads—where forest meets open roadside—experience increased predation pressure, invasive species colonization, and altered microclimate, reducing the quality of adjacent habitat. For a species already in steep decline and dependent on large, connected landscapes for seasonal migration between summer range and winter grounds, road-induced fragmentation would accelerate population loss in one of the few remaining refuges.

Invasive Species Establishment Along Road Corridors and Disruption of Riparian Succession

Road construction creates disturbed soil corridors that are colonized by invasive species like cheatgrass, a documented threat in the Bighorn Mountains that is exacerbated by soil disturbance. In the Walker Prairie area, where conifers are already encroaching into historically open riparian areas and wet meadows—displacing native willow and aspen communities—roads would accelerate this process by providing dispersal corridors for invasive seeds and creating the soil conditions they require to establish. Once invasive species dominate roadsides, they spread into adjacent undisturbed habitat, fundamentally altering the plant community composition that supports the Northern Goshawk, migratory songbirds, and ungulates dependent on productive riparian forage.

Loss of Elevational Connectivity and Compression of Climate Refugia for Vulnerable Plant Species

Road construction fragments the subalpine elevational gradient by creating barriers to seed dispersal and limiting the ability of species to track shifting climate conditions upslope. For vulnerable species like mountain lady's-slipper and white bog orchid—already restricted to specific moisture and temperature conditions—roads would isolate populations on either side of the disturbance, preventing genetic exchange and range expansion as climate warms. The edge effects created by roads (altered microclimate, invasive species, increased light) would further compress the narrow elevational band where these species can survive, reducing available habitat and increasing extinction risk in a landscape where upslope migration is already constrained by the finite height of the mountains themselves.

The Walker Prairie Roadless Area encompasses 62,434 acres of subalpine terrain in the northern Bighorn National Forest, ranging from 6,924 feet at lower creek drainages to 9,489 feet at Black Mountain. The area's roadless condition—no motorized access, no new road construction—defines the character of all recreation here. Trails are native material, lightly maintained, and require navigation skills; campgrounds are dispersed or at established sites like East Fork and Ranger Creek. This is backcountry recreation: distance, weather, and self-reliance are constants.

Hiking and Horseback Travel

Seventeen trails provide access to subalpine meadows, ridgelines, and creek drainages. The Walker Prairie Trail (014), 11.3 miles, is the area's signature route—a faint, often overgrown passage between mountains and river valleys that requires map and compass skills; travelers keep mountains to the left and river to the right when heading south. Wolf Creek Trail (001), 9.2 miles, descends from Black Mountain Road through Walker Prairie to Quartz Creek, offering a primary access loop when combined with Quartz Creek Trail (003), 5.5 miles. Black Mountain Lookout Trail (011), 1.0 mile, climbs steeply to a 1939 CCC-built fire tower at 9,489 feet with 360-degree views of Cloud Peak Wilderness and the Bighorn crest. Hendrick Ridge Trail (005), 4.5 miles, enters from the north with multiple creek crossings and steep climbing. Shorter routes include Roosevelt Trail (016), 4.9 miles; Sawmill Trail (009), 4.3 miles; and Alden Creek Trail (072), 2.4 miles. All trails are open to hikers and horses; most receive minimal maintenance, and snow lingers into July at these elevations. The roadless condition means no vehicle access to trailheads—approach from forest roads on the perimeter—and no motorized use within the area, preserving the quiet, undisturbed character essential to backcountry travel.

Hunting

The Walker Prairie area supports mule deer (Hunt Area 24), elk (Hunt Area 38), and black bear (Black Bear Hunt Area 1), managed by the Wyoming Game and Fish Department's Sheridan Region. Archery seasons for big game run September 1–30; rifle seasons open October 15. Dusky Grouse and Ruffed Grouse inhabit the forested slopes and are hunted September 1–December 31. Cottontail rabbit and Snowshoe hare seasons run September 1–March 31. Black bear seasons include spring (April 15–June 15) and fall (August 1–November 15); female harvest is quota-managed. All hunters must wear fluorescent orange or pink during rifle seasons. Access is non-motorized only—foot or horse travel via the trail system—which concentrates hunting pressure on established routes and maintains the area's backcountry character. Winter range closures in November or December protect wintering elk and deer on lower slopes. The roadless condition ensures that trophy-quality elk and mule deer remain undisturbed during critical seasons, and that hunters experience the Bighorn Mountains as they have for generations: on foot or horseback, in silence, without the fragmentation caused by roads.

Fishing

Big Goose Creek and its West Fork, along with Wolf Creek and Walker Creek, support wild populations of Rocky Mountain Cutthroat Trout (native), Brook Trout, Rainbow Trout, and Brown Trout. The Wyoming Game and Fish Department and USDA Forest Service are restoring native Yellowstone Cutthroat populations in these headwaters. Streams in the Bighorn River drainage (Area 2) have a creel limit of three trout per day, with no more than one exceeding 16 inches; the combined limit for all trout is six per day. Most streams are open year-round, though snow and high water limit access seasonally. Access is by foot or horse only—no motorized vehicles—which keeps fishing pressure low and preserves the cold, undisturbed headwater habitat that native cutthroat require. The roadless condition protects spawning grounds and stream flows; roads would fragment these watersheds and introduce the erosion and sedimentation that degrade trout habitat. Anglers here fish remote, high-elevation streams where the absence of roads means cleaner water and healthier populations.

Birding

The subalpine and forest habitats support Dusky Grouse and Ruffed Grouse in forested areas, with spring display activity March–May. High-elevation residents include Gray-crowned Rosy-Finch, Clark's Nutcracker, Mountain Bluebird, Townsend's Solitaire, and Brown Creeper. Summer breeders include Yellow-rumped Warbler, Swainson's Thrush, and Hermit Thrush in coniferous forest. American Dipper inhabits riparian zones along creeks. Fall migration brings Harlequin Duck to fast-moving mountain streams. Winter activity is limited to hardy residents and altitudinal migrants. Birding access is via primitive trails and cross-country travel; no designated blinds or observation platforms exist. The roadless condition preserves interior forest habitat for warblers and thrushes, maintains undisturbed riparian corridors for dippers and waterfowl, and keeps the area quiet—essential for hearing grouse displays and forest songbirds. Roads would fragment these habitats and introduce noise that masks bird calls.

Photography

Black Mountain Lookout (9,489 ft) offers panoramic views across the Bighorn crest and surrounding roadless terrain. Herdrick Ridge (8,400 ft) and Walker Prairie itself (7,068 ft) provide expansive vistas of subalpine meadows and peaks. Big Goose Creek headwaters and Red Canyon offer water features and geological contrast. Wildflower displays peak late June through July in subalpine meadows—arrowleaf balsamroot, sticky geranium, white bog orchid, and mountain lady's-slipper. Moose frequent willow-dominated riparian shrublands along creeks; elk and mule deer are common in forest and meadow edges. High-elevation birds—Dusky Grouse, Canada Jay, Clark's Nutcracker—are photographable along trails. The area's high elevation and extreme distance from light pollution create exceptional conditions for Milky Way and deep-sky photography. The roadless condition preserves the dark skies and undisturbed wildlife behavior that make photography here possible; roads bring light pollution, vehicle noise, and habitat fragmentation that degrade both scenic and wildlife photography opportunities.