South Dakota Highway 240

South Dakota Highway 240
Fredddie · Public domain · source
State	SD
Type	SD
Route	240
Length mi	40.972
Established	1975
Direction a	West
Terminus a	Interstate 90 near Badlands National Park
Direction b	East
Terminus b	South Dakota Highway 44 near Wall, South Dakota
Counties	Pennington County; Jackson County; Mellette County

South Dakota Highway 240 is a state highway in South Dakota that provides a scenic bypass and access route through the Badlands National Park area, connecting Interstate 90 to South Dakota Highway 44 near Wall, South Dakota. The route serves as an arterial connector for visitor traffic to Badlands attractions, linking nearby communities and federal facilities. It enhances regional mobility between the Black Hills, the Pine Ridge Indian Reservation, and Interstate corridors used by freight, tourism, and local travel.

Route description

South Dakota Highway 240 begins at an interchange with Interstate 90 west of Wall, South Dakota and proceeds southeast into the Badlands National Park boundary, following a two-lane pavement alignment shaped by the Badlands formations and White River drainage. As it traverses the park, the highway passes near the Ben Reifel Visitor Center, offering access to overlooks, interpretive trails, and park roads that lead toward Badlands Loop Road and the Sage Creek Wilderness. The corridor intersects park spur roads that provide links to the Conata Basin, the Minuteman Missile Site, and backcountry access used by visitors traveling between Rapid City and Custer. East of the park, the route returns to the plains and terminates at an intersection with South Dakota Highway 44 just north of Wall Drug, facilitating ties to U.S. Route 14 and long-distance routes toward Pierre and Sioux Falls.

History

The corridor that became SD 240 followed historic wagon, ranching, and federal access tracks used during settlement eras associated with events like the Dakota Territory land rushes and administrative developments around the Badlands National Monument designation. Route numbering and designation evolved during state highway renumbering efforts in the mid-20th century, with formal establishment recorded in the 1970s to improve visitor routing following increased tourism after the creation of adjacent federal facilities including expansions tied to National Park Service management. Infrastructure projects paralleled broader transportation initiatives across South Dakota Department of Transportation networks, coordinating with regional planning entities to serve increasing automobile traffic tied to attractions such as Badlands National Park and commercial centers in Wall and Rapid City. Maintenance and alignment adjustments responded to geomorphological considerations of the Badlands landscape and to statewide efforts mirrored in other corridors like U.S. Route 16 and Interstate 90 upgrades.

Major intersections

- Western terminus: interchange with Interstate 90 (Exit near Wall, South Dakota) - Intersection with park access spurs providing links to Ben Reifel Visitor Center and Badlands Loop Road - Junctions providing access to service roads toward Wall Drug and U.S. Route 14 - Eastern terminus: intersection with South Dakota Highway 44 north of Wall, South Dakota

Traffic and usage

Traffic volumes on SD 240 fluctuate seasonally, peaking during summer months when visitation to Badlands National Park and regional festivals in Wall and Rapid City spike. The route supports mixed-use traffic including private vehicles, recreational vehicles en route to campgrounds and overlooks, commercial deliveries to roadside businesses such as Wall Drug, and government service vehicles for entities like the National Park Service and South Dakota Department of Transportation. Traffic studies conducted by state planning agencies parallel methodologies used on corridors such as Interstate 90 and U.S. Route 16A to monitor average annual daily traffic and to plan maintenance, shoulder improvements, and visitor-safety measures at overlooks and trailheads.

Points of interest and attractions

SD 240 provides primary access to notable destinations: the Ben Reifel Visitor Center and multiple scenic overlooks within Badlands National Park; the Badlands Loop Road scenic drive and trailheads leading to fossil beds and interpretive exhibits; proximity to the roadside attraction Wall Drug in Wall, South Dakota; wildlife viewing areas associated with Sage Creek Wilderness and prairie dog towns observed from pullouts; and links to nearby historic sites such as the Minuteman Missile National Historic Site. The corridor also connects to broader regional attractions including cultural sites on the Pine Ridge Indian Reservation and outdoor recreation hubs in the Black Hills region like Mount Rushmore National Memorial and Wind Cave National Park.

Category:State highways in South Dakota Category:Transportation in Pennington County, South Dakota Category:Transportation in Jackson County, South Dakota Category:Transportation in Mellette County, South Dakota