Middle Fork

The Middle Fork encompasses 51,772 acres of subalpine terrain in the Shoshone National Forest, spanning elevations from 8,200 feet in Sinks Canyon to over 10,500 feet at Mount Arter. The landscape is defined by its position as headwaters for the Middle Popo Agie River, which originates in the high basins and drains northward through a network of named tributaries including Sawmill Creek, Roaring Fork Creek, Silas Creek, Atlantic Creek, and Fiddlers Creek. Water moves rapidly from the alpine ridges through steep-sided canyons and across basin floors, carving the primary drainage corridors that structure both the hydrology and the distribution of plant communities across the area.

The forest composition shifts with elevation and moisture availability. At lower elevations and in protected canyons, Subalpine Fir–Engelmann Spruce Forest dominates, with dense stands of subalpine fir (Abies lasiocarpa) and Engelmann spruce (Picea engelmannii) creating a dark, cool understory where grouse whortleberry (Vaccinium scoparium) and mountain snowberry (Symphoricarpos rotundifolius) form the shrub layer. Lodgepole pine (Pinus contorta) forests occupy drier slopes and areas recovering from disturbance, often with mountain snowberry in the understory. At higher elevations and on exposed ridges, whitebark pine (Pinus albicaulis), the federally threatened whitebark pine, occurs in open Whitebark Pine–Idaho Fescue Parkland, where the canopy thins and Idaho fescue (Festuca idahoensis) and bluebunch wheatgrass (Pseudoroegneria spicata) dominate the ground layer. Quaking aspen (Populus tremuloides) forms scattered stands in transition zones, particularly in the Populus tremuloides–Symphoricarpos oreophilus Association. Willow Riparian Communities line the streams, dominated by tea-leafed willow (Salix planifolia), creating linear corridors of moisture and structural diversity through the drier surrounding forest.

Large carnivores structure the food web across multiple scales. The federally threatened grizzly bear (Ursus arctos horribilis) and the federally threatened Canada lynx (Lynx canadensis) are apex predators in this landscape; the lynx hunts snowshoe hares in the dense spruce-fir forests, while grizzlies forage across elevation gradients from berry-producing understories to alpine meadows. The federally threatened North American wolverine (Gulo gulo luscus) occupies the highest, most remote terrain. In the aquatic systems, the federally endangered pallid sturgeon (Scaphirhynchus albus) inhabits the lower reaches of the Middle Popo Agie River drainage, while Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and brook trout (Salvelinus fontinalis) occupy the cold headwater streams. Clark's nutcracker (Nucifraga columbiana) plays a critical role in whitebark pine regeneration, caching seeds that establish new trees across the parkland. The federally endangered whooping crane (Grus americana) and the federally threatened piping plover (Charadrius melodus) use the open basins and riparian areas seasonally. Greater sage-grouse (Centrocercus urophasianus), near threatened (IUCN), depend on the grassland and shrubland mosaics at mid-elevations. The proposed endangered Suckley's cuckoo bumble bee (Bombus suckleyi) and the proposed threatened monarch butterfly (Danaus plexippus) move through flowering communities across the elevation gradient, with the federally threatened western prairie fringed orchid (Platanthera praeclara) providing nectar in specific wetland and grassland settings.

A visitor ascending from Sinks Canyon follows the Middle Popo Agie River through increasingly dense spruce-fir forest, the canopy closing overhead as elevation rises and the understory darkening to near-twilight beneath the conifers. The sound of water is constant but changes character—from the roar of rapids in the canyon to the quieter murmur of smaller creeks as the trail climbs into the basins. Breaking into Little Popo Agie Basin or Cony Basin, the forest opens into parkland where whitebark pines stand scattered across meadows of Idaho fescue and bluebunch wheatgrass, the view expanding toward the ridgelines of Cony Mountain and Mount Arter. The air cools noticeably with each hundred feet of elevation gain. Crossing Cyclone Pass at 10,260 feet places the visitor above the continuous forest, where only the hardiest subalpine fir and whitebark pine persist, and the ground layer shifts to alpine grasses and low-growing shrubs. The transition from the dark, sheltered canyons to the open, wind-exposed ridges—a change of less than three miles horizontally but nearly 2,000 feet vertically—encompasses the full range of forest communities and the ecological relationships that sustain the area's wildlife.

The region now encompassed by the Middle Fork Roadless Area has been inhabited for at least 10,000 years. The Eastern Shoshone were the primary historical inhabitants of this territory, with a specialized branch called the Tukudika or Sheepeaters living year-round in the high-altitude mountain environments of the Wind River and Absaroka ranges. The Tukudika derived their name from their reliance on mountain sheep, which they trapped using stone pens and corrals found throughout the forest. The Northern Arapaho, historically a nomadic Plains tribe, moved into the region in the 1800s and currently share the neighboring Wind River Indian Reservation with the Eastern Shoshone. The mountainous terrain provided abundant game meat, including elk, deer, and mountain sheep, supporting subsistence hunting practices. The Washakie Trail, which crosses the crest of the Wind River Range, was historically used by the Shoshone to navigate between the Wind River and Green River watersheds. The Bannock and Lemhi tribes used transmountain routes through the forest to reach buffalo hunting grounds in the Big Horn Basin. Indigenous groups used the forest as a refuge during winter months, seeking shelter in the timbered hills from the exposed high plains to the east. The high-altitude areas were frequented by the Shoshone and Lakota for spiritual healing and vision quests.

Early nineteenth-century mountain men and explorers, including John Colter and Jim Bridger, traveled through the southern Shoshone forest and the Wind River Range. The Raynolds Expedition, guided by Bridger, explored the nearby Union Pass area between 1859 and 1860.

The Shoshone National Forest was established on March 30, 1891, when President Benjamin Harrison issued a proclamation under the authority of the Forest Reserve Act of 1891. Originally named the Yellowstone Park Timberland Reserve, it was recognized as the first federally protected forest reserve in the United States. The reserve was created with an initial gross acreage of 1,689,680 acres. President Theodore Roosevelt greatly expanded the reserve and subsequently divided it into four separate units in 1902; the Shoshone unit was the largest of these divisions. A resurvey in 1911 reduced the recorded acreage to approximately 1,609,000 acres. Congress added land along the North Fork of the Shoshone River in 1921 to correct inconsistencies between the original proclamation and official forest boundaries. In 1926, the National Forest Reservation Commission recommended the inclusion of an additional 28,390 acres in Park and Hot Springs Counties. Upon the creation of the U.S. Forest Service in 1905, the reserve was officially designated a National Forest. On July 1, 1908, Executive Order 895 formally established the Shoshone National Forest from lands formerly part of the Yellowstone National Forest, with headquarters established in Cody, Wyoming. In 1945, the Washakie National Forest, comprising 866,263 acres, was discontinued as a separate entity and its lands were added to the Shoshone National Forest.

Since the forest's establishment in 1891, the region has been managed as a critical watershed to provide a regular flow of water for irrigation in the Bighorn Basin and surrounding valleys. Livestock grazing, including cattle and sheep, has been a primary historical and contemporary land use throughout the forest.

Large portions of the Shoshone National Forest were later designated as protected wilderness, including the Washakie Wilderness in 1972, the Fitzpatrick Wilderness in 1976, and the Popo Agie Wilderness in 1984. The Middle Fork area comprises 51,772 acres and is currently designated as an Inventoried Roadless Area, protected under the 2001 Roadless Area Conservation Rule. The area is managed to prohibit road construction and reconstruction, preserving its primitive character. This management reflects a conservation precedent established by the Eastern Shoshone and Northern Arapaho Tribes, who designated the adjacent 188,000-acre Wind River Roadless Area on the reservation to prohibit development in the late 1930s, nearly thirty years before the national Wilderness Act of 1964.

Vital Resources Protected

Headwater Protection for Federally Endangered Pallid Sturgeon

The Middle Fork area contains the headwaters of the Middle Popo Agie River and tributary systems including Sawmill Creek, Roaring Fork Creek, and Atlantic Creek. These cold, sediment-free headwater streams are essential spawning and rearing habitat for the federally endangered pallid sturgeon, which depends on clear water and stable substrate conditions throughout its entire downstream migration corridor to the Missouri River system. The roadless condition preserves the natural hydrology and riparian buffer that maintains the water clarity and temperature stability these fish require—conditions that are difficult to restore once degraded by erosion and sedimentation.

Alpine and Subalpine Connectivity for Threatened Large Carnivores

The area's subalpine terrain—including Cony Mountain (10,190 ft), Mount Arter (10,530 ft), and Cyclone Pass (10,260 ft)—provides unfragmented habitat connectivity across elevation zones critical for the federally threatened Canada lynx, federally threatened grizzly bear, and federally threatened North American wolverine. These species require large, continuous tracts of undisturbed forest and alpine terrain to move between seasonal ranges and maintain genetic connectivity across populations. The Subalpine Fir–Engelmann Spruce Forest and Whitebark Pine–Idaho Fescue Parkland ecosystems in this roadless area function as a climate refugium—a landscape where species can shift their ranges upslope as temperatures warm—and fragmentation by roads would eliminate the connectivity that allows this adaptive movement.

Whitebark Pine Ecosystem Integrity and Threatened Species Habitat

The Whitebark Pine–Idaho Fescue Parkland ecosystem in the high-elevation basins (Cony Basin at 9,700 ft, Little Popo Agie Basin at 8,300 ft) supports the federally threatened whitebark pine, which is also listed as endangered under the IUCN Red List. This species is declining across the West due to white pine blister rust and mountain pine beetle, making intact, undisturbed populations increasingly rare. The roadless condition protects the subalpine dry-mesic spruce-fir forest structure and the native Idaho Fescue–Bluebunch Wheatgrass grassland understory that support whitebark pine regeneration and the associated wildlife community, including the federally threatened piping plover and the near-threatened black rosy-finch that depend on high-elevation habitats.

Migratory Corridor for Federally Endangered Whooping Crane and Threatened Greater Sage-Grouse

The Middle Fork's subalpine basins and grassland complexes provide critical stopover and staging habitat for the federally endangered whooping crane during migration and for the near-threatened greater sage-grouse, which uses high-elevation plateaus for seasonal movement. The willow riparian communities along the drainage network and the open Idaho Fescue grasslands provide the specific vegetation structure these species require for foraging and roosting during vulnerable migration periods. Road construction and associated habitat fragmentation would disrupt these movement corridors, increasing predation risk and energy expenditure during migration.

Threats from Road Construction

Sedimentation and Stream Temperature Increase Threatening Pallid Sturgeon Spawning Habitat

Road construction requires cutting slopes and removing riparian vegetation along the drainage network. Exposed soil on cut slopes erodes during precipitation events, delivering sediment into headwater streams and degrading the clear-water conditions and stable gravel substrate that pallid sturgeon require for spawning. Simultaneously, removal of the riparian forest canopy along tributaries increases solar exposure to the water column, raising stream temperatures—a direct physiological stress for a species adapted to cold-water conditions. These changes occur cumulatively across the entire drainage network and persist for decades even after road use ceases, making restoration of spawning habitat extremely difficult.

Habitat Fragmentation and Edge Effects Disrupting Large Carnivore Movement and Breeding

Road construction fragments the continuous subalpine forest and alpine terrain into isolated patches, creating barriers to movement for Canada lynx, grizzly bear, and North American wolverine—species that require large home ranges and genetic connectivity across populations. The roads themselves create linear corridors of human activity and vehicle strikes that increase mortality risk. Additionally, roads generate edge effects: increased light penetration, temperature fluctuations, and invasive species colonization along the disturbed corridor degrade the interior forest habitat quality that these species depend on for denning, hunting, and breeding. For wolverine in particular, which requires vast, undisturbed alpine tracts, fragmentation of the high-elevation basins would eliminate the secure habitat necessary for population persistence.

Invasive Species Establishment and Competitive Displacement of Native Alpine Vegetation

Road construction creates disturbed soil corridors that are highly susceptible to colonization by invasive species such as cheatgrass. In the subalpine and alpine zones where native vegetation recovery is slow due to short growing seasons and harsh conditions, invasive species establishment along road corridors can spread into adjacent undisturbed areas, outcompeting the native Idaho Fescue–Bluebunch Wheatgrass grassland and the understory vegetation that supports whitebark pine regeneration. This competitive displacement is particularly difficult to reverse in high-elevation ecosystems where native species are already stressed by climate change and disease, and where the roadless condition currently prevents the initial disturbance that allows invasives to establish.

Culvert Barriers and Hydrological Disruption Fragmenting Aquatic Habitat for Pallid Sturgeon and Native Fish Communities

Road crossings of streams require culverts or bridges that often create barriers to fish movement, particularly for species like pallid sturgeon that migrate long distances to access spawning habitat. Additionally, road fill and drainage structures disrupt the natural hydrology of riparian areas and wetland-upland transition zones, altering water table elevation and flow patterns that support the willow riparian communities and the aquatic invertebrate communities that pallid sturgeon and other native fish depend on for food. These hydrological changes persist indefinitely, fragmenting what is currently a continuous, connected aquatic system into isolated habitat patches where populations cannot interbreed and where local extinctions cannot be recolonized.

The Middle Fork Roadless Area encompasses 51,772 acres of subalpine terrain in the Shoshone National Forest, ranging from 8,200 feet at Sinks Canyon to over 10,500 feet at Mount Arter and Cony Mountain. The area's roadless condition preserves backcountry access to high-elevation lakes, cold-water fisheries, and wildlife habitat across the Wind River Range.

Hiking, Horseback Riding, and Mountain Biking

The area supports a network of maintained trails accessed from six primary trailheads: Bears Ears, Worthen Meadows, Christina Lake, Middle Fork, Blue Ridge, and North Fork/Smith Lake. The Middle Fork Trail (700) is the most heavily traveled route, running 15.8 miles through the heart of the roadless area; horseback riders can use a newly built bypass to avoid narrow ledge sections. The Sheep Bridge Trail (701) is a 2.6-mile technical route rated Double Black Diamond for mountain biking and Hard for hiking, featuring a steep climb to a saddle and primary downhill direction when ridden north. Moderate day hikes include the Silas Lake Trail (722) at 2.1 miles with views of Cony Mountain, and the Atlantic Lake Trail (723) at 1.7 miles. Longer backpacking routes include the Bears Ears Trail (716) at 19.5 miles through rugged terrain, the North Fork Trail (710) at 14.7 miles, and the Smith Lake Trail (715) at 6.5 miles. The Continental Divide National Scenic Trail passes through the area, offering high-quality scenic travel along the Wind River Range crest. Stock users must carry certified weed-free hay and possess proof of Coggins testing and brand inspection; public corrals are available at the Middle Fork Trailhead. Portions of the area bordering the Popo Agie Wilderness are restricted to non-motorized use; a free permit is required for stock users in the wilderness. Trails remain accessible from late spring through fall, though high-elevation areas may hold snow through July. The roadless condition preserves these trails from fragmentation by roads and allows horseback and foot travel to remain the primary access to the interior backcountry.

Hunting

The Middle Fork area supports hunting for all major big game species native to Wyoming except whitetail deer: elk, mule deer, moose, bighorn sheep, pronghorn antelope, mountain goat, black bear, and grizzly bear. The Shoshone National Forest hosts the largest population of bighorn sheep in the contiguous United States. Greater Sage-Grouse are present in lower-elevation basins and grasslands; Dusky Grouse and Ruffed Grouse inhabit the coniferous forests. Small game and furbearers include marten, badger, muskrat, ermine, mink, red fox, coyote, and bobcat. General big game seasons typically run September 15 to November 15; archery seasons occur in September. A spring black bear season runs May 1 to June 15. Nonresidents hunting in federal wilderness areas must be accompanied by a licensed outfitter or resident guide. The area is part of the Greater Yellowstone Ecosystem and subject to grizzly bear safety protocols and food storage regulations. Specific portions of the forest serve as crucial winter range for elk and deer. Access points include Sinks Canyon (8,200 ft) at the southern edge, Blue Ridge on the eastern portion, and the Bruce Picnic Site near Popo Agie Falls. The roadless condition restricts motorized travel to designated routes, requiring hunters to access the interior on foot or horseback, preserving the area's unfragmented habitat and allowing wildlife to remain undisturbed by road-related disturbance.

Fishing

The Middle Fork of the Popo Agie River supports excellent fishing for Yellowstone Cutthroat Trout, Brown Trout, Rainbow Trout, and Mountain Whitefish. High alpine lakes throughout the area support Golden Trout, Rainbow Trout, Brook Trout, and Cutthroat Trout. The Middle Fork is characterized as a wild trout fishery. Wyoming Area 2 (Wind River Drainage) regulations apply: creel limit is six trout per day, with no more than two cutthroat trout exceeding 12 inches. Note that the Middle Fork of the Popo Agie River is closed to fishing from "the Rise" in Sinks Canyon State Park downstream to the bridge on Sinks Canyon Road; this closure is immediately adjacent to the roadless area boundary. Primary access to the Middle Fork headwaters requires wilderness-style backpacking or horse packing from the Bruce Picnic Site near Popo Agie Falls or from the Blue Ridge/Fiddlers Lake area. Stock users in the adjacent Popo Agie Wilderness must obtain a free permit from the Washakie Ranger District. Upper sections of the river feature steep gradients and difficult wading in freestone environments. The area is Grizzly Bear country; anglers must follow food storage regulations. The roadless condition preserves cold headwater streams and intact riparian habitat, maintaining the wild trout populations and the quiet, undisturbed character essential to backcountry fishing.

Birding

The Middle Fork area supports diverse bird communities across riparian, forest, and high-elevation habitats. The American Dipper nests behind waterfalls and forages in the Middle Fork Popo Agie River and nearby streams; other riparian species include Yellow Warbler, MacGillivray's Warbler, and Song Sparrow. Golden Eagles and Prairie Falcons nest on the rocky canyon rims of adjacent Sinks Canyon. Subalpine and coniferous forests host Gray Jay, Steller's Jay, Clark's Nutcracker, Mountain Chickadee, Townsend's Solitaire, and various woodpeckers. Dusky Grouse and Ruffed Grouse inhabit the coniferous forests; Greater Sage-Grouse and Sandhill Cranes are found in lower-elevation basins and grasslands. Summer breeding residents include Warbling Vireo, Lazuli Bunting, Western Tanager, Broad-tailed Hummingbird, and Green-tailed Towhee. Rufous Hummingbirds appear in late June to utilize high-elevation flowers. Winter residents include Townsend's Solitaire, Black-billed Magpie, and Golden Eagle. The area is documented habitat for the Endangered Whooping Crane. Birding access is available via the Middle Fork Trail (700) for dispersed observation in subalpine forests and meadows, and via the Blue Ridge Lookout near Fiddlers Lake for high-elevation species and raptors. The roadless condition preserves interior forest habitat for breeding warblers and other songbirds, maintains unfragmented riparian corridors for water-dependent species, and keeps the area free from road noise and disturbance.

Paddling

The Middle Popo Agie River offers Class V whitewater paddling in two primary sections. The Falls Section is a 1.7-mile reach requiring hiking access; the Sinks Section is a 2.7-mile reach more commonly paddled, with put-in at Bruce's Parking Area (off Sinks Canyon Road) and take-out at Sinks Cavern where the river disappears underground. A lower section from the Highway 181 bridge to Sinks Cavern is Class III–V. The primary paddling season is late spring through early summer during peak snowmelt runoff; the river is described as "quite powerful" in places and is not recommended for beginners. In late summer, water levels drop and the river becomes shallower and potentially unrunnable. The roadless condition preserves the river's wild character and ensures that paddlers experience the Middle Popo Agie in its natural state, without road access or development affecting the whitewater corridor.

Photography

The Middle Fork area offers scenic photography opportunities across multiple elevations and seasons. The Blue Ridge Lookout, a historic fire lookout on a stone outcropping near Fiddlers Lake, provides panoramic views extending into the adjacent Popo Agie Wilderness. Cyclone Pass (10,260 ft), Cony Mountain (10,190 ft), and Mount Arter (10,530 ft) serve as high-point vistas. Popo Agie Falls, accessible via a 1.5-mile trail from the Bruce Picnic Area, offers waterfall photography. Subalpine meadows in the Idaho Fescue and Bluebunch Wheatgrass grasslands display wildflowers during summer; the Whitebark Pine–Idaho Fescue Parkland provides unique high-alpine botanical subjects. Wildlife photography opportunities include Grizzly bear, Moose, Bighorn sheep, American Pika, and Clark's Nutcracker in high-elevation rocky zones. The Middle Fork and its tributaries support Yellowstone Cutthroat Trout and Golden Trout. Sinks Canyon State Park, immediately adjacent to the roadless area, was designated Wyoming's first International Dark Sky Place in 2023. The Middle Fork roadless area shares these exceptionally dark sky conditions due to its lack of artificial lighting and high elevation, making it suitable for stargazing and night sky photography. The roadless condition preserves the dark sky resource and ensures that scenic vistas remain free from road-related visual intrusion.