Deadhorse

The Deadhorse Roadless Area covers 10,690 acres in northeastern Oregon's Wallowa Valley Ranger District, in the canyon-cut country between the Wallowa Mountains and Hells Canyon. The terrain ranges through subalpine ridges, mid-elevation timber, and dry grassland breaks that fall toward the Imnaha and Snake River systems. Dead Horse Ridge runs across the upper basin; Cold Canyon and the side drainages of Bear Gulch fall away beneath it. Water leaves the area through a fan of named streams — Dead Horse Creek, Cottonwood Creek, Little Sheep Creek, Big Sheep Creek, Wild Horse Creek, Cold Creek, Honeymoon Creek, Happy Creek, Muley Creek, and Steer Creek among others — together with the standing water of Dead Horse Lake and the seep of Gowing Spring. These channels drain to the lower Imnaha and Snake.

The area's elevation range and canyon walls produce abrupt community changes within short distances. The upper basin holds Rocky Mountain Subalpine Meadow and Northern Rockies Subalpine Grassland with scattered Rocky Mountain Lodgepole Pine Forest. Lower slopes carry Southern Rockies Mixed Conifer Forest and Northern Rockies Ponderosa Pine Woodland, with ponderosa pine (Pinus ponderosa) and Douglas-fir (Pseudotsuga menziesii) above an understory of creeping Oregon-grape (Berberis repens) and showy green-gentian (Frasera speciosa). South-facing breaks open to Columbia Basin Canyon Grassland and Northern Rockies Foothill and Valley Grassland — bunchgrass slopes punctuated by Intermountain Mountain Mahogany Woodland and the silver-leaved Great Basin Big Sagebrush Steppe. Northern Rockies Foothill Streamside Woodland and pockets of Rocky Mountain Aspen Forest line the wet draws, where black cottonwood (Populus trichocarpa) shades springbrooks.

The aquatic and terrestrial food webs are tied together in the canyon system. Bull trout (Salvelinus confluentus) and mountain whitefish (Prosopium williamsoni) occupy cold headwater reaches of Big Sheep Creek and its tributaries; American dipper (Cinclus mexicanus) feeds along the same channels, and American beaver (Castor canadensis) work the lower streamside woodlands. Open ponderosa stands and snag-rich edges support Lewis's woodpecker (Melanerpes lewis), Cassin's finch (Haemorhous cassinii), and calliope hummingbird (Selasphorus calliope). Golden eagle (Aquila chrysaetos) and bald eagle (Haliaeetus leucocephalus, delisted) ride the canyon thermals above grasslands where rock wren (Salpinctes obsoletus) and western rattlesnake (Crotalus oreganus) inhabit the talus. Gray wolf (Canis lupus) follows herds of mule deer (Odocoileus hemionus) through the timber-to-grassland edges. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

A visitor crossing Deadhorse moves through these zones in a single day. From Dead Horse Ridge the line of sight runs east across Cold Canyon to the broken steppe falling toward the Imnaha; gophersnake (Pituophis catenifer) tracks cross the dust on south aspects. Dropping into the upper drainages of Big Sheep Creek, the trail enters Douglas-fir shade and the sound of running water; rufous hummingbird (Selasphorus rufus) and ruffed grouse (Bonasa umbellus) move through the understory of common camas (Camassia quamash) and Cusick's Indian-paintbrush (Castilleja cusickii). Along the streambanks of Cottonwood Creek, the canyon air cools sharply under cottonwoods, and the dipper's call carries above the riffles.

The lands now containing the Deadhorse Roadless Area — drained by Big Sheep Creek, Little Sheep Creek, Dead Horse Creek, Cottonwood Creek, and other tributaries of the Imnaha country — lie within the historical homeland of the Wallowa Band of nimíipuu (Nez Perce), whose chiefs and people occupied the Wallowa Valley and the canyons that fall east toward the Snake River. The Treaty of 1855 designated a portion of the Nez Perce homeland as a reservation, but the Treaty of 1863 reduced it in size by 90 percent, leaving the Wallowa Valley "outside of the Nez Perce Reservation" [2]. President Grant set the upper Wallowa Valley aside as a reservation by executive order on June 16, 1873, and rescinded that order on June 10, 1875 under pressure from incoming settlers [4]. In 1877 the U.S. government demanded that all non-treaty Nez Perce move to the reservation near Lapwai, Idaho [1]. On May 31, 1877, Chief Joseph's band forded the Snake River at Dug Bar on the eastern edge of their Wallowa homeland; "several thousand head of horses and cattle were also forced to swim the river, with considerable losses" [2]. The flight that followed covered 1,170 miles across four states [1].

Euro-American stockmen had begun entering the valley in the years before the war. James Tulley examined Wallowa County for its grazing potential in 1871, and the next spring he and his brother Erasmus brought 300 head of cattle and horses [4]. An 1866 government survey had reported "bunchgrasses covered the hills and valleys," and the canyons drained by Big Sheep Creek and the Imnaha became prized winter range [4]. Wallowa County was officially separated from Union County on February 11, 1887 [4]. Within a generation, federal records described an addition to the new forest that "included… the Big Sheep Creek, Marr Flat area, the Lower Imnaha, and lower Snake River areas" — roughly 800,000 acres in a single transfer [4].

Federal forest administration followed quickly. In 1905, the Wallowa, Wenaha, and Chesnimnus Forest Reserves were established in northeastern Oregon, following the Baker City Forest Reserve already in place since 1904 [5]. The Whitman Forest Reserve was added on July 1, 1908 [5]. Regulation of grazing on these new federal lands began under Chief Forester Gifford Pinchot in 1905-1906 [4]; Forest Supervisor H.K. O'Brien reported 251,830 sheep under permit on the Wallowa Reserve in 1906, with 18,702 cattle and horses [4]. At one time forty bands of sheep grazed the high Wallowa Mountains [4]. The Wallowa-Whitman National Forest, headquartered in Baker City, today encompasses 2.4 million acres of public lands in northeastern Oregon and western Idaho [3]. Deadhorse, a 10,690-acre Inventoried Roadless Area within the Wallowa Valley Ranger District in Wallowa County, is protected under the 2001 Roadless Area Conservation Rule.

Vital Resources Protected

• Bull Trout Cold-Water Stream Integrity: Big Sheep Creek, Little Sheep Creek, Dead Horse Creek, Cottonwood Creek, and related Imnaha tributaries provide the cold, well-oxygenated headwater habitat that bull trout (Salvelinus confluentus, federally threatened with critical habitat) require for spawning and rearing. The roadless condition keeps Northern Rockies Foothill Streamside Woodland intact along these channels, holds fine sediment on slopes, and preserves the connectivity between headwater spawning reaches and the downstream Imnaha and Snake River corridors that adult fish use for migration.

• Canyon Grassland and Bunchgrass Steppe: Columbia Basin Canyon Grassland covers nearly 45 percent of the area, with Northern Rockies Foothill and Valley Grassland, sagebrush steppe, and Intermountain Mountain Mahogany Woodland on the breaks. These bunchgrass communities, supported by intact native soils and the absence of new road corridors, hold habitat for Spalding's catchfly (Silene spaldingii, federally threatened) and MacFarlane's four-o'clock (Mirabilis macfarlanei, federally threatened) along with the open-canyon foraging habitat used by golden eagle and Lewis's woodpecker.

• Connected Conifer-to-Grassland Mosaic for Wide-Ranging Mammals: The unfragmented gradient from Rocky Mountain Subalpine Meadow and Lodgepole Pine Forest through Mixed Conifer Forest and Ponderosa Pine Woodland into canyon grassland gives wide-ranging mammals — gray wolf (Canis lupus), North American wolverine (Gulo gulo luscus, federally threatened), and mule deer — the seasonal habitat shifts they need within a single, unbroken landscape. Roadlessness keeps these movements intact at the spatial scale these animals actually use.

Potential Effects of Road Construction

• Sedimentation and Bull Trout Spawning Failure: Road cuts and ditches on the steep mixed-conifer slopes above Big Sheep, Little Sheep, and Dead Horse Creeks deliver fine sediment directly into spawning gravels — a documented threat to bull trout populations. Sediment smothers redds and reduces egg-to-fry survival, and removal of streamside canopy raises summer water temperatures past the narrow range bull trout require. These effects compound year after year because road surface runoff continues for the life of the road.

• Invasive Plant Corridors into Canyon Grassland: Roads built into Columbia Basin Canyon Grassland and Northern Rockies Foothill Pine Wooded Steppe act as dispersal corridors for cheatgrass (Bromus tectorum) and other non-native annuals already documented as pervasive threats to these communities and to Spalding's catchfly. Disturbed road shoulders provide a foothold for invasion, and once cheatgrass enters a bunchgrass slope it alters the fire regime in ways that suppress native perennial grasses and the federally listed plants that depend on them.

• Habitat Fragmentation for Wide-Ranging Wildlife: A road bisecting the conifer-to-grassland gradient introduces traffic, human presence, and edge effects that reduce the effective interior habitat available to wolverine, gray wolf, mule deer, and Lewis's woodpecker. Transportation and service corridors are ranked as a direct threat to MacFarlane's four-o'clock and Lewis's woodpecker in NatureServe assessments; for wide-ranging species, the effect is the loss of connectivity between forested, riparian, and grassland blocks within a single home range — a loss that cannot be restored after the road is in place.

The Deadhorse Roadless Area covers 10,690 acres of mountainous canyon country in Wallowa County, in the Wallowa-Whitman National Forest's Wallowa Valley Ranger District. The area sits between the Wallowa Mountains and the Imnaha River canyon, with Dead Horse Ridge running across the upper basin and Cold Canyon dropping off its flank. Forest Service records show no maintained system trails, designated trailheads, or developed campgrounds within the area itself. Recreation here is dispersed backcountry use: cross-country hiking and horseback travel from access points on the surrounding roads, fall and spring big-game hunting, fishing in the streams that drain the basin, and wildlife observation across the conifer-to-grassland gradient.

Hunting follows Oregon Department of Fish and Wildlife seasons and tag rules and is the most common documented activity. The area lies within the Sled Springs and Chesnimnus management units historically associated with the Wallowa-Whitman cattle and sheep range. Hunters pursue Rocky Mountain elk, mule deer (Odocoileus hemionus), American black bear, and mountain lion; upland bird hunters work forest edges and bunchgrass slopes for ruffed grouse (Bonasa umbellus), California quail (Callipepla californica), and wild turkey (Meleagris gallopavo). The roadless condition keeps elk and deer on traditional summer and winter range across Dead Horse Ridge and Cold Canyon without the vehicle pressure that displaces game from comparable open-road country.

Fishing concentrates on the cold headwater channels. Big Sheep Creek, Little Sheep Creek, and Cottonwood Creek hold mountain whitefish (Prosopium williamsoni) and lie within the broader range of bull trout (Salvelinus confluentus) — a federally threatened species that requires catch-and-release handling and is closed to harvest under Oregon regulations. Trout fishing in the area follows ODFW rules for the Imnaha River basin, and anglers should consult current regulations before entering. American beaver (Castor canadensis) shape pools on the lower streamside woodlands, and American dipper (Cinclus mexicanus) works the same cold riffles.

Wildlife watching and birding draw visitors to the open country around Deadhorse. Six eBird hotspots fall within 24 kilometers of the area; the most productive — Zumwalt Prairie — has recorded 160 species across more than 250 checklists, and Kinney Lake follows with 155 species. Within Deadhorse itself, observers can expect Lewis's woodpecker (Melanerpes lewis) and Cassin's finch (Haemorhous cassinii) in open ponderosa pine, golden eagle (Aquila chrysaetos) and rock wren (Salpinctes obsoletus) on the canyon breaks, and calliope hummingbird (Selasphorus calliope) and rufous hummingbird (Selasphorus rufus) in flowering subalpine meadows. Gray wolf (Canis lupus) is documented in the broader Imnaha unit, and tracks and sign are part of moving through the area.

Backcountry travel — hiking, horse packing, and dispersed camping — is unconstrained by formal trail systems. Cross-country routes follow historic stock driveways along ridges such as Dead Horse Ridge and through saddle crossings between the Bear Gulch and Big Sheep Creek drainages. Wildflower observation and photography are well suited to the area: spring brings carrotleaf biscuitroot (Lomatium multifidum), small camas (Camassia quamash), Cusick's paintbrush (Castilleja cusickii), and prairie smoke (Geum triflorum) to bunchgrass slopes, while summer carries the showy green-gentian (Frasera speciosa) into the higher meadows.

What ties these activities together is the absence of roads through the interior. The big-game herds that anchor fall hunting, the cold-water reaches that hold mountain whitefish and bull trout habitat, and the open ridge crossings used by horse parties all depend on the area's unfragmented landscape — none of which can be reproduced after a road grid is built across it.