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| M-139 | |
|---|---|
| State | Michigan |
| Type | State highway |
| Route | M-139 |
| Length mi | 20.017 |
| Established | 1939 |
| Maint | MDOT |
| Direction a | South |
| Terminus a | Indiana State Road 39 |
| Direction b | North |
| Terminus b | U.S. Route 12 |
| Counties | Berrien County |
M-139
M-139 is a state trunkline highway in Berrien County, Michigan serving as a north–south connector between the Indiana state line and U.S. Route 12 near Benton Harbor, Michigan. The route links rural and urban communities, providing access to industrial sites, recreational areas, and regional transportation corridors, and is maintained by the Michigan Department of Transportation. The highway intersects with several major routes and parallels portions of the St. Joseph River watershed, facilitating movement between Elkhart, Indiana, South Bend, Indiana, and the Southwestern Michigan Airport region.
M-139 begins at the Indiana state line where it connects with Indiana State Road 39 and proceeds northward into Berrien County, Michigan. The trunkline travels through mixed agricultural and residential zones near New Buffalo, Michigan and then skirts the western periphery of Buchanan, Michigan while providing access to local roads that lead to I-94 and U.S. Route 20. Continuing north, M-139 intersects with arterial routes that serve St. Joseph, Michigan and Benton Harbor, Michigan, including junctions that offer connections to M-63 and BL I-94 before terminating at U.S. Route 12 east of downtown Benton Harbor. Along its course, the roadway passes near industrial facilities linked to Whirlpool Corporation, agricultural suppliers tied to the Michigan Farm Bureau, and recreational sites adjacent to the Jean Klock Park and waterfront access to the Lake Michigan basin.
The designation of M-139 was established in 1939 as part of a statewide effort by the Michigan State Highway Department to rationalize numbered routes during the lead-up to the World War II mobilization period. Early alignments shifted to serve growing industrial traffic associated with manufacturers such as Whirlpool Corporation and suppliers for the Ford Motor Company and General Motors. Postwar expansions in the 1950s and 1960s were influenced by the development of the Interstate Highway System, notably Interstate 94, prompting local authorities to realign sections of M-139 to improve access to I-94 interchanges and to support commuter flows into Kalamazoo, Michigan and Chicago, Illinois. The route saw resurfacing and minor widening projects in the 1970s and 1980s overseen by the Michigan Department of Transportation, and safety upgrades in the 1990s coincided with economic initiatives promoted by the Berrien County Chamber of Commerce and regional planning by the Southwest Michigan Planning Commission.
M-139 connects a series of important corridors and local arterials that link to regional and national routes. Notable intersections include its southern terminus at Indiana State Road 39, junctions providing access to U.S. Route 20, ramps facilitating movement toward Interstate 94, and a northern terminus at U.S. Route 12. Along the route are connections to state and local roads that feed into M-63, Business Loop I-94, and surface streets leading into Benton Harbor, Michigan and St. Joseph, Michigan. These intersections support linkages to transportation nodes that serve South Bend International Airport, Chicago Midway International Airport, and freight corridors used by rail carriers such as Amtrak lines passing through the Southwest Michigan region.
Traffic volumes on M-139 vary from low-density rural counts near the Indiana border to higher volumes approaching Benton Harbor. The Michigan Department of Transportation monitors average annual daily traffic, with peaks related to seasonal tourism tied to Lake Michigan beaches and events hosted in Benton Harbor and St. Joseph. Commercial vehicle traffic includes freight movements servicing manufacturing plants connected to firms such as Whirlpool Corporation and suppliers to General Motors and Ford Motor Company. Commuter patterns link smaller communities along M-139 to employment centers in Benton Harbor, St. Joseph, and the South Bend metropolitan area, and transit agencies coordinated by the Southwest Michigan Planning Commission factor the route into regional mobility plans.
Planned improvements to M-139 have been coordinated by the Michigan Department of Transportation in collaboration with the Berrien County Road Commission and regional stakeholders including the Southwest Michigan Planning Commission and the Berrien County Chamber of Commerce. Proposed projects emphasize pavement rehabilitation, targeted widening at high-traffic intersections near Benton Harbor, and safety enhancements inspired by studies commissioned by the National Highway Traffic Safety Administration. Funding discussions have involved state transportation budgets and grant opportunities from entities such as the United States Department of Transportation and regional development agencies. Long-term proposals consider multimodal enhancements to better integrate M-139 with transit services provided by county and municipal operators, and to support economic development initiatives championed by organizations like the Michigan Economic Development Corporation.
Category:State highways in Michigan