Twin Butte Creek

Twin Butte Creek encompasses 6,700 acres of rolling lowland prairie and riparian woodland within the Dakota Prairie Grasslands. The area drains northward through Twin Butte Creek and Black Horse Butte Creek toward the North Fork Grand River, with water originating from unnamed seeps and springs scattered across the landscape. These creeks and their associated wetlands form the hydrologic core of the area, creating distinct zones of vegetation and wildlife habitat as water moves from upland grassland through riparian corridors.

The landscape is dominated by two primary grassland communities that reflect subtle differences in soil moisture and composition. Western Wheatgrass (Pascopyrum smithii) and Green Needlegrass (Nassella viridula) form the drier upland grasslands, often mixed with Silver Wormwood (Artemisia ludoviciana), while lower-lying areas support Western Wheatgrass paired with Blue Grama (Bouteloua gracilis). Along the creek bottoms, the vegetation shifts dramatically to Cottonwood-Willow Riparian Forest, where Plains Cottonwood (Populus deltoides) dominates the canopy. Adjacent to these riparian corridors, Green Ash (Fraxinus pennsylvanica) and Common Snowberry (Symphoricarpos albus) form a distinct woodland community. In the wettest depressions, Prairie Cordgrass (Sporobolus michauxianus) creates wet meadows that hold water seasonally.

The area supports several bird species of continental significance. The federally endangered whooping crane and federally threatened piping plover use the wet meadows and shallow water margins during migration. The federally threatened rufa red knot passes through during its long-distance migration between Arctic breeding grounds and South American wintering areas. Sharp-tailed grouse (Tympanuchus phasianellus) use the grasslands for breeding and display, while the western burrowing owl (Athene cunicularia hypugaea) hunts small mammals in the open prairie. Black-tailed prairie dogs (Cynomys ludovicianus) create extensive colonies that alter soil structure and vegetation patterns, supporting a distinct community of species dependent on their burrows and mounding activity. Pronghorn (Antilocapra americana) move across the grasslands, and coyotes (Canis latrans) hunt throughout the area. Pollinators including the proposed endangered Suckley's cuckoo bumble bee (Bombus suckleyi), the proposed threatened monarch butterfly (Danaus plexippus), and the proposed threatened western regal fritillary (Argynnis idalia occidentalis) depend on native flowering plants across the grassland and riparian zones.

Walking through Twin Butte Creek, a visitor experiences the transition from open grassland to riparian woodland as they approach the creeks. The upland prairie stretches across rolling terrain with low shrubs and scattered juniper, the grass shifting underfoot from the coarser texture of western wheatgrass to the finer needles of green needlegrass. As elevation drops and moisture increases, the landscape darkens with the approach of cottonwoods and willows along the creek margins, where the sound of running water becomes audible and the air holds the smell of wet soil. The wet meadows near the creek channels support a different plant community entirely—lower, denser, and visibly greener than the surrounding grassland. Moving back upslope, the transition reverses, and the open prairie reasserts itself, with the distant buttes providing visual reference points across the rolling terrain.

The Twin Butte Creek area lies within the ancestral hunting grounds of the Lakota, specifically the Hunkpapa and Sans Arc bands, whose territory encompassed these lands under the 1868 Treaty of Fort Laramie. The Cheyenne and Arapaho also hunted throughout the western Dakotas and were allied with the Lakota during conflicts over these lands in the nineteenth century. Archaeological evidence documents over 11,500 years of human history across the Dakota Prairie Grasslands. Tipi rings and campfire remnants found throughout the grassland testify to sustained occupation. The buttes that give Twin Butte Creek its name served Indigenous peoples as landmarks for navigation and as sites for vision quests and other spiritual ceremonies. The breaks and coulees of the Grand River drainage provided winter camp locations, offering protection from severe prairie winds. Early nineteenth-century frontiersmen including Hugh Glass and Jim Bridger passed through or visited the Grand River region during the era of fur trade expansion.

In the early 1900s, European immigrants settled the area under the Homestead Act, converting grasslands to cropland. During the 1930s, severe drought and high winds transformed the region into the Dust Bowl, rendering the homesteading enterprises unsustainable.

The federal government acquired these lands during the 1930s Dust Bowl era under the Bankhead-Jones Farm Tenant Act of 1937 through "Submarginal Land Projects" designed to restore severely eroded lands. Following acquisition, the land was transitioned from failed cropland back to livestock grazing. In 1960, these federal holdings were formally designated as National Grasslands.

The Dakota Prairie Grasslands was established in 1998 as a separate administrative unit of the U.S. Forest Service by the Chief of the Forest Service, consolidating management of four National Grasslands—the Little Missouri, Sheyenne, and Cedar River Grasslands in North Dakota and the Grand River National Grassland in South Dakota—previously administered as part of the Custer National Forest based in Billings, Montana. The Twin Butte Creek area was identified as "Suitable for Wilderness" in the 2002 Land and Resource Management Plan, and its boundaries were enlarged in 2002 to include supplemental qualifying acreage and state school lands. The area is currently protected under the 2001 Roadless Area Conservation Rule.

Vital Resources Protected

Migratory Shorebird and Crane Staging Habitat

Twin Butte Creek's wet meadows and riparian corridors provide critical stopover habitat for federally endangered whooping cranes (Grus americana) and federally threatened piping plovers (Charadrius melodus) and rufa red knots (Calidris canutus rufa) during spring and fall migration. These species depend on intact, undisturbed grassland-wetland mosaics where they can rest and forage without disturbance. The roadless condition preserves the quiet, open landscape these birds require—road construction would introduce noise, vehicle traffic, and human presence that directly disrupt feeding behavior and increase predation risk during the vulnerable migration window.

Native Prairie-Riparian Vegetation Mosaic

The area's Western Wheatgrass–Green Needlegrass grasslands interspersed with Cottonwood–Willow riparian forest and Prairie Cordgrass wet meadows form an interconnected native plant community that is already degraded across the broader landscape. This roadless area contains some of the least-disturbed examples of these plant associations on the Dakota Prairie Grasslands. The Green Ash/Common Snowberry woodland and riparian forest buffer Twin Butte Creek and its unnamed seeps and springs, filtering runoff and stabilizing banks. Road construction would fragment this mosaic, creating edge effects that favor invasive species establishment and reduce the area available for native prairie-dependent species like Western meadowlarks and pollinators.

Pollinator and Native Insect Habitat

The intact grassland and flowering riparian understory support populations of Suckley's cuckoo bumble bee (Bombus suckleyi, proposed federally endangered), monarch butterflies (Danaus plexippus, proposed federally threatened), and Western regal fritillary butterflies (Argynnis idalia occidentalis, proposed federally threatened). These species require continuous native flowering plants and undisturbed soil for nesting and larval development. The roadless condition maintains the structural complexity and plant diversity these insects depend on; roads create compacted, disturbed corridors that eliminate nesting substrate and fragment populations into isolated patches too small to sustain viable breeding.

Headwater Stream and Seep Integrity

Twin Butte Creek originates within this roadless area, and the presence of unnamed seeps and springs indicates groundwater discharge zones that feed the creek year-round. These headwater systems are particularly sensitive to hydrological disruption and sedimentation. The current "Poor" rating for aquatic habitat reflects existing degradation, making the remaining intact riparian vegetation and undisturbed streambanks essential for any recovery. Road construction would introduce chronic sediment loading from cut slopes and culvert installation, further degrading water quality and eliminating the fine spawning gravels and cool-water refugia that remaining native fish populations require.

Threats from Road Construction

Sedimentation and Stream Temperature Increase from Canopy Removal

Road construction requires clearing vegetation along the roadbed and cut slopes, removing the Cottonwood–Willow riparian forest canopy that currently shades Twin Butte Creek and its tributaries. Loss of this canopy increases water temperature, reducing dissolved oxygen and creating thermal stress for cold-water-dependent aquatic species. Simultaneously, exposed cut slopes erode during precipitation events, delivering fine sediment into the drainage network. This sediment smothers spawning gravels and clogs the gills of aquatic invertebrates that form the base of the food web for migratory shorebirds and any remaining native fish. The Twin Butte Creek watershed is already rated "Poor" for aquatic habitat; road-induced sedimentation would accelerate its degradation beyond recovery timescales.

Habitat Fragmentation and Edge-Effect Invasion in Grassland-Riparian Mosaic

Road construction fragments the Western Wheatgrass–Green Needlegrass grasslands and Prairie Cordgrass wet meadows into isolated patches separated by the road corridor and its associated disturbed margins. This fragmentation creates hard edges where invasive species (already rated "Fair" in watershed assessments) establish along the road verge and spread into adjacent native plant communities. Piping plovers, whooping cranes, and rufa red knots require large, continuous areas of undisturbed grassland and wetland to forage safely; fragmentation increases predation risk and reduces the effective carrying capacity of the area for these federally protected species. Once invasive species become established in the road corridor, they persist indefinitely, preventing natural recovery of native vegetation even if the road were eventually closed.

Disruption of Pollinator Connectivity and Nesting Substrate Loss

Road construction removes native flowering plants and disturbs soil across the roadbed and adjacent cleared areas, eliminating nesting habitat for ground-nesting bees like Suckley's cuckoo bumble bee and larval host plants for monarch butterflies and Western regal fritillary butterflies. The road corridor becomes a barrier to pollinator movement between remaining patches of native grassland and riparian woodland, isolating populations and reducing genetic connectivity. Compacted soil along the road prevents the burrowing and emergence of native bee species. Because these three species are already proposed for federal protection due to population declines, the loss of habitat and connectivity in this roadless area—one of the least-degraded examples of their native plant community—would directly undermine recovery efforts across the broader Dakota Prairie Grasslands.

Hydrological Disruption of Seeps and Springs

Road construction requires fill material and drainage structures (culverts, ditches) that alter groundwater flow paths feeding the unnamed seeps and springs within the roadless area. These seeps are the source of year-round baseflow to Twin Butte Creek; disruption of groundwater discharge reduces streamflow during dry periods, concentrating remaining water into isolated pools where aquatic habitat quality declines further. Reduced streamflow also diminishes the riparian vegetation that depends on consistent soil moisture, causing die-back of Cottonwood and Willow that provide shade, bank stability, and food resources for migratory birds. The cumulative effect—reduced water, elevated temperature, increased sedimentation, and loss of riparian structure—would render Twin Butte Creek unsuitable for the whooping cranes, piping plovers, and red knots that currently depend on it as a migration stopover.

Twin Butte Creek spans 6,700 acres of rolling mixed-grass prairie and river breaks in the Dakota Prairie Grasslands near Lemmon, South Dakota. The area contains Twin Butte Creek, Black Horse Butte Creek, and the Grand River, flowing through grassland and riparian forest dominated by cottonwood, willow, and green ash. Because the roadless area prohibits new road construction, recreation here depends entirely on non-motorized access—foot, horseback, or canoe—and the undisturbed character that makes the backcountry experience possible.

Hiking and Horseback Riding. No formally maintained trails exist within the roadless area; travel is cross-country across rolling prairie and through river breaks. The terrain supports both hiking and horseback riding, with access gained by parking at the perimeter and walking or riding into the drainage. The East Twin Butte Vista, a 15-minute walk from the end of the southwest gravel road, reaches a saddle offering panoramic views of the Little Missouri State Scenic River valley and, on clear days, views extending into Montana. Higher points on the buttes reveal dramatic sandstone caps and geologic formations. Late fall through spring offers easier travel; summer brings heat, mosquitoes, and heavy undergrowth.

Hunting. The area supports public hunting for sharp-tailed grouse in grassland habitat, mule deer and white-tailed deer in mixed prairie and riparian zones, pronghorn antelope across open terrain, and waterfowl in riparian corridors along Twin Butte Creek, Black Horse Butte Creek, and the Grand River. Black-tailed prairie dog colonies are open to year-round varmint hunting. Hunters must use nontoxic shot for all shotgun hunting and are prohibited from hunting over bait. Western burrowing owls, which inhabit prairie dog towns, are protected. Access is by foot or horseback from the roadless perimeter; the absence of roads ensures a backcountry hunting experience and protects unfragmented habitat for game species.

Fishing. The North Fork Grand River supports channel catfish; Twin Butte Creek and Black Horse Butte Creek provide backcountry fishing opportunities in a prairie river system characterized by intermittent flows and seasonal water level changes. The Grand River is designated as limited-access shore fishing. No fish stocking occurs within the roadless area; anglers target wild populations. Access requires parking at the boundary and hiking into the drainage. A valid South Dakota fishing license is required. The roadless condition preserves undisturbed riparian habitat and cold-water stream corridors essential to native fish populations.

Birding. The area is a documented breeding site for grassland specialists including Sprague's Pipits and Baird's Sparrows. Other species include long-billed curlew, marbled godwit, upland sandpiper, sharp-tailed grouse, ferruginous hawk, and golden eagle. Riparian areas support wild turkey, eagles, and falcons. The Twin Butte Creek area is part of the Buttes and Prairies Loop of the Black Hills, Badlands and Lakes Birding Trail. Best birding occurs April through October, with breeding season (spring and summer) offering the best views of nesting grassland specialists. The roadless condition maintains interior grassland habitat critical for species like Baird's Sparrows, which require large unfragmented prairie blocks.

Photography. The East Twin Butte Vista provides panoramic views of regional landmarks and the Little Missouri valley. The buttes' distinctive twin appearance with connecting saddle is visible from the east. Seasonal wildflower blooms peak mid-May through early July, featuring pasqueflower, prairie forbs, and riparian species including cottonwood, willow, green ash, and juniper. Wildlife subjects include sharp-tailed grouse (especially around buffaloberry clumps), pronghorn, mule deer, coyote, black-tailed prairie dogs, western burrowing owls, horned toads, and prairie rattlesnakes. The area supports rare species including whooping crane, piping plover, and monarch butterfly. Dark skies free from light pollution allow stargazing and Milky Way photography. The roadless condition preserves the quiet, undisturbed landscape essential to wildlife photography and the visual integrity of the buttes and prairie vistas.