South Dakota Highway 28

South Dakota Highway 28 is a state highway traversing central and eastern South Dakota, connecting multiple county seats, reservations, and regional corridors. The route links rural communities and intersects with interstate and U.S. routes, providing an east–west arterial for agriculture, energy, and local travel between the Missouri River valley and the Minnesota border. Originally part of the early 20th‑century numbered highway system, the corridor has seen alignments, resurfacing, and bridge projects reflecting regional economic shifts tied to railroads, agriculture in the United States, and energy development.

Route description

The highway begins near the North Dakota state line and proceeds eastward, crossing terrain shaped by Glacial Lake Agassiz and the Missouri River basin before continuing toward Brookings, South Dakota and the Big Sioux River. Along its course it intersects major north–south routes such as U.S. Route 83, Interstate 29, and U.S. Route 81, and provides access to municipal centers including Pierre, South Dakota and Huron, South Dakota via connecting state roads. The corridor serves tribal communities adjacent to the Cheyenne River Indian Reservation, links to freight lines of the BNSF Railway and the former Chicago and North Western Transportation Company, and traverses mixed grass prairie and loess soils that support corn, soybean, and cattle operations referenced in reports by the United States Department of Agriculture and the South Dakota Department of Transportation. Structures along the alignment include multiple short-span bridges over tributaries feeding the Missouri River and grade-separated crossings near rail yards associated with Norfolk Southern rights-of-way.

History

The highway was designated in the 1920s as part of the national push to create numbered state routes during the expansion of the Lincoln Highway era and the establishment of the American Association of State Highway Officials. Early improvements were coordinated with New Deal programs under agencies such as the Civilian Conservation Corps and the Works Progress Administration, which funded graveling and bridge work during the Great Depression. Post‑World War II investments paralleled federal initiatives like the Federal-Aid Highway Act of 1956, even as the route remained primarily a state responsibility under the South Dakota Legislature and the South Dakota Department of Transportation. Realignments occurred to bypass downtown sections of small towns influenced by changing freight patterns following mergers involving the Great Northern Railway and Union Pacific Railroad. Recent decades have seen pavement rehabilitation projects tied to commodity booms, including ethanol development supported by incentives at the Iowa State University extension level and regional grain elevator expansions.

Major intersections

The highway intersects several principal routes that facilitate interstate and regional travel: junctions with U.S. Route 83 provide north–south continuity toward North Platte, Nebraska and Minot, North Dakota; connections with Interstate 29 enable travel toward Sioux Falls, South Dakota and Fargo, North Dakota; and crossings of U.S. Route 81 and U.S. Route 14 link to corridors toward Aberdeen, South Dakota and Rapid City, South Dakota. Local intersections tie into state highways serving county seats such as Pierre and Huron, as well as access routes to federal facilities administered by the Bureau of Land Management and regional airports like Huron Regional Airport. Interchanges and at‑grade junctions follow standards aligned with publications from the American Association of State Highway and Transportation Officials.

Traffic and usage

Traffic volumes along the corridor vary from low rural counts in prairie reaches to higher daily averages near urbanized nodes and interchanges with Interstate 29. The highway carries a mix of passenger vehicles, agricultural equipment, and heavy trucks hauling grain, livestock, and petroleum products linked to regional terminals operated by firms such as CHS Inc. and cooperative elevators coordinated with the National Grain and Feed Association. Seasonal patterns reflect harvest periods and winter weather impacts managed by the National Weather Service and state snow‑removal operations informed by the Federal Highway Administration performance measures. Safety reports and crash statistics are maintained by the South Dakota Department of Public Safety in coordination with county sheriffs’ offices and metropolitan police in larger municipalities.

Future plans and improvements

Planned work in state transportation improvement programs includes pavement rehabilitation, bridge replacements, and safety upgrades to sightlines and shoulders driven by analyses from the South Dakota Department of Transportation and grant opportunities from the Federal Highway Administration. Projects may coordinate with rural broadband initiatives funded by the United States Department of Agriculture Rural Development and with multimodal planning involving Amtrak corridor studies and freight logistics consultations with the Surface Transportation Board. Local economic development authorities and county commissions continue to prioritize corridor resilience to support agriculture export markets, renewable energy siting for developers like those working with MidAmerican Energy Company, and emergency response links to facilities such as Avera Health hospitals.

Category:State highways in South Dakota