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| Illinois Route 16 | |
|---|---|
| State | IL |
| Type | IL |
| Route | 16 |
| Maint | Illinois Department of Transportation |
| Length mi | 174.66 |
| Direction a | West |
| Terminus a | Sullivan |
| Direction b | East |
| Terminus b | Mattoon |
| Counties | Moultrie County, Shelby County, Cumberland County, Coles County, Effingham County, Clay County, Jasper County |
Illinois Route 16 is an east–west state highway running across central Illinois, connecting Sullivan in the west to Mattoon in the east. Serving agricultural regions and small cities, the route links communities to interstate corridors such as Interstate 57 and Interstate 70 while intersecting with U.S. Routes including US 51 and US 45. The road supports local commerce tied to Chicago, St. Louis, and regional centers like Decatur and Effingham.
Illinois Route 16 traverses a mix of rural and urban landscapes through counties including Moultrie, Shelby, Cumberland, Coles, Effingham, Clay, and Jasper. Beginning near Sullivan, the highway proceeds eastward passing near towns such as Hillsboro, Pana, Shelbyville, Ashmore, and Lovington before reaching Mattoon. Along its alignment the route intersects rail corridors operated by Norfolk Southern Railway, CSX Transportation, and Union Pacific Railroad, and provides access to regional airports like Effingham County Memorial Airport and Coles County Memorial Airport. The corridor parallels water features including segments of the Kaskaskia River watershed and crosses tributaries feeding into the Embarras River and Little Wabash River. Key intersections connect to arterial routes such as US 36, US 40, and state highways including Illinois Route 1, Illinois Route 32, and Illinois Route 121.
The corridor that became Illinois Route 16 follows historic wagon roads and early 19th-century military trails used during westward expansion and settlement associated with communities like Jacksonville and Champaign. The designation emerged from statewide numbering initiatives administered by the Illinois Department of Transportation and its predecessors, aligning with the national push for standardized routes contemporaneous with the development of the U.S. Highway System and ordinances influenced by legislators from districts represented in the Illinois General Assembly. Over decades the route experienced realignments to bypass central business districts in towns such as Pana and Shelbyville as automobile traffic increased alongside freight movements tied to manufacturers in Decatur and distribution centers serving Chicago and St. Louis. Wartime and postwar federal programs including initiatives by the Federal Highway Administration contributed funding for resurfacing and bridge improvements, while local planning commissions in counties like Coles and Effingham coordinated corridor preservation with rural township boards.
The route connects with numerous regional and national highways and municipal thoroughfares: - Western terminus near Sullivan: junction with Illinois Route 32. - Intersection with US 51 near Pana. - Crossings with Illinois Route 33 and Illinois Route 49 in central segments serving Shelby County. - Interchange proximity to Interstate 70 in the Effingham area, with access to US 40 and Interstate 57 corridors near Mattoon. - Eastern terminus in Mattoon: connections to US 45, Illinois Route 121, and local freight routes servicing Mattoon Rail Yard and regional commerce.
Several state and U.S. routes intersect, overlap, or run parallel to the corridor, forming relationships important for network redundancy and access to urban centers such as Champaign-Urbana, Bloomington-Normal, and Springfield. Notable nearby and intersecting routes include Illinois Route 32, Illinois Route 121, Illinois Route 130, US 36, US 51, US 45, and Interstate 57. Historic alignments created former spurs now designated as county roads managed by entities such as county highway departments in Jasper and Clay. The corridor also interacts with regional transit providers including services coordinated by the East Central Illinois Regional Airport planning bodies and municipal transportation authorities in cities like Effingham and Mattoon.
Traffic volumes vary considerably, with higher average daily traffic near urbanized centers such as Effingham and Mattoon and lower volumes across agricultural stretches in Shelby County and Jasper County. The route carries a mix of passenger vehicles, agricultural equipment, and freight trucks serving grain elevators tied to companies like Archer Daniels Midland Company and Cargill in the Midwest supply chain. Seasonal patterns reflect harvest periods associated with crops in the Corn Belt and transportation peaks during regional events hosted in municipalities like Pana (noted for festivals drawing attendees from Springfield and Decatur). Safety and maintenance metrics are tracked by the Illinois Department of Transportation and local sheriffs’ offices, with traffic enforcement coordinated with state troopers from the Illinois State Police.
Planned and proposed projects affecting the corridor include resurfacing, bridge replacement, and intersection safety improvements funded through state transportation plans and federal grant programs administered by the Federal Highway Administration and coordinated with the Illinois Department of Transportation. Local economic development initiatives in counties along the route—supported by chambers of commerce in Effingham, Mattoon, and Pana—may spur widening or bypass construction to improve freight access to intermodal facilities and highway interchanges linking to Interstate 57 and Interstate 70. Environmental assessments for projects consider impacts on waterways in the Kaskaskia River basin and habitats overseen by agencies like the Illinois Department of Natural Resources. Public meetings conducted by county boards and regional planning commissions will shape timelines, with potential funding sources including state capital improvement programs and federal infrastructure legislation ratified by the United States Congress.