M-140 (Michigan highway)

M-140
M-140 highlighted in red
Route information
Maintained by MDOT
Length	37.205 mi[1] (59.876 km)
Existed	c. 1931[2][3]–present
Major junctions
South end	M-139 in Niles
Major intersections	M-62 near Eau Claire I-94 near Watervliet
North end	I-196 / US 31 / LMCT / BL I-196 at South Haven
Location
Country	United States
State	Michigan
Counties	Berrien, Van Buren
Highway system
Michigan State Trunkline Highway System Interstate US State Byways
← M-139 → US 141

M-140 is a north–south state trunkline highway in Berrien and Van Buren counties of the US state of Michigan. The highway starts in the Niles area at M-139 and runs north through Watervliet to South Haven, ending at Interstate 196/US Highway 31 (I-196/US 31). In between, it runs through farm fields and past lakes in the southwestern part of the Lower Peninsula. The trunkline is used, on average, by between 1,500 and 10,200 vehicles.

The state designated M-140 in the early 1930s over a previous alignment of US 31 when that highway rerouted through the area. M-140 was extended from Watervliet to Niles a few years later. Changes were made to the routing of the trunkline in the 1950s and 1960s. The last change was made in 1972, resulting in the modern course for the highway.