South Dakota Highway 100

South Dakota Highway 100
State	South Dakota
Type	SD
Route	100
Direction a	West
Direction b	East
Counties	Lincoln County, Minnehaha County

South Dakota Highway 100 is a state-designated arterial corridor in eastern South Dakota intended to provide a circumferential route around the eastern side of Sioux Falls connecting suburban and rural corridors with interstates and U.S. highways. The project has been advanced by the South Dakota Department of Transportation in coordination with Minnehaha County, Lincoln County, and regional planning authorities to relieve congestion on Interstate 29 and Interstate 90 and to serve growth near Sioux Falls Regional Airport and the Big Sioux River. The corridor interfaces with federal and state routes and with municipal road networks in the Sioux Falls metropolitan area.

Route description

The alignment runs through suburban neighborhoods, industrial parks, and agricultural land east of Sioux Falls and parallels sections of the Big Sioux River floodplain while intersecting major routes such as Interstate 29, Interstate 90, U.S. Route 18, and South Dakota Highway 42. Beginning near the I-29/I-90 interchange and skirting the eastern edge of the Sioux Falls Regional Airport, the corridor provides access to commercial centers near Commerce Park, employment nodes near Sioux Falls Business Park, and residential subdivisions bounding Brandon and Tea. Roadway features include multi-lane divided segments, signalized intersections at urban collectors, and grade-separated interchanges where it connects to limited-access highways such as Interstate 229. Environmental contexts along the route involve crossings or proximity to wetlands identified by U.S. Fish and Wildlife Service datasets, wooded riparian corridors mapped by South Dakota Game, Fish and Parks, and soils cataloged by the United States Department of Agriculture.

History

Planning for an eastern bypass around Sioux Falls traces to regional studies led by the Sioux Falls Metropolitan Planning Organization and long-range transportation plans adopted by South Dakota Department of Transportation in the late 20th and early 21st centuries. Early conceptual reports referenced precedents such as the development of beltways around Minneapolis–Saint Paul, Kansas City metropolitan area, and Omaha, Nebraska to accommodate suburbanization and freight flow. Funding initiatives involved federal programs administered by the Federal Highway Administration and state bonding measures debated in the South Dakota Legislature. Archaeological reviews engaged the State Historical Society of South Dakota and consultations with Native American tribal offices, including the Yankton Sioux Tribe and other tribal governments with historical ties to the region. Phased construction advanced amid coordination with utilities including Xcel Energy and MidAmerican Energy Company, and right-of-way acquisitions invoked statutes overseen by the United States Department of Transportation.

Major intersections

The corridor connects with a range of federal, state, and local thoroughfares. Principal junctions include interchanges or at-grade intersections with Interstate 29, Interstate 90, Interstate 229, U.S. Route 18, South Dakota Highway 42, and county routes administered by Minnehaha County Highway Department and Lincoln County Highway Department. The route also ties into arterial streets within Sioux Falls such as Minnesota Avenue and corridors leading toward Downtown Sioux Falls, the Sioux Falls Regional Airport, and business districts frequented by commuters from Brandon and Dell Rapids.

Future plans and expansions

Long-range plans prepared by the Sioux Falls Metropolitan Planning Organization and South Dakota Department of Transportation envision completing additional segments to create a continuous eastern bypass, constructing further grade separations, and upgrading at-grade intersections to controlled-access interchanges in response to projected growth patterns associated with Sioux Falls Regional Airport expansion and industrial development near Porter alignments. Funding scenarios have considered allocations from the Infrastructure Investment and Jobs Act and matching state funds approved by the South Dakota Legislature. Environmental review processes will require coordination with the Environmental Protection Agency and state agencies, and mitigation measures may reference practices from U.S. Army Corps of Engineers permitting for wetlands impacts.

Traffic and usage

Traffic studies conducted by the Sioux Falls Metropolitan Planning Organization and South Dakota DOT show corridor volumes rising with suburban expansion, with peak-hour commuter flows linking bedroom communities like Tea and Brandon to employment centers in Sioux Falls. Freight movements utilize connections to Interstate 29 and Interstate 90 for regional distribution to markets including Minneapolis–Saint Paul, Omaha, Nebraska, and Kansas City, Missouri. Peak congestion points are often at intersections with South Dakota Highway 42 and access ramps serving Sioux Falls Regional Airport, prompting model-based signal timing and ramp-metering studies similar to those conducted by metropolitan agencies in St. Louis, Indianapolis, and Milwaukee.

Maintenance and management

Ongoing operations and maintenance fall under the purview of the South Dakota Department of Transportation in partnership with county highway departments and municipal public works agencies in Sioux Falls and neighboring towns. Routine activities include pavement preservation informed by standards from the American Association of State Highway and Transportation Officials, winter snow removal coordinated with county emergency management offices, and bridge inspections following National Bridge Inspection Standards. Asset management systems tie into statewide databases overseen by South Dakota DOT and complement federal reporting requirements to the Federal Highway Administration.

Category:State highways in South Dakota